Oracle查询dba_extents视图很慢
Oracle查询dba_extents视图很慢
问题描述
下边这条SQL查询每次大概要花1分钟左右，实在是比较异常。
select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name;
测试分析
先实际跑完一遍，去详细的执行信息。
模板复制：
set pagesize 9999 long 9999 line 500
alter session set statistics_level=all;
select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name;
select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));
执行时间如下：
20:25:06 SYS@anonymous> set pagesize 9999 long 9999 line 500
20:25:15 SYS@anonymous> alter session set statistics_level=all; Session altered. Elapsed: 00:00:00.00
20:26:33 SYS@anonymous> select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name; OWNER TABLESPACE_NAME
------------------------------ ------------------------------
SYS SYSTEM Elapsed: 00:01:01.87
获取执行计划：
20:27:48 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID dggb0d96bj8dy, child number 4
-------------------------------------
select owner,tablespace_name from dba_extents where segment_name='AUD$'
group by owner,tablespace_name Plan hash value: 1482657742 ------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem |
------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | 1 |00:01:01.87 | 190K| 7157 | | | |
| 1 | HASH GROUP BY | | 1 | 543K| 1 |00:01:01.87 | 190K| 7157 | 2331K| 2194K| 435K (0)|
| 2 | VIEW | DBA_EXTENTS | 1 | 543K| 259 |00:01:01.87 | 190K| 7157 | | | |
| 3 | UNION-ALL | | 1 | | 259 |00:01:01.87 | 190K| 7157 | | | |
| 4 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 5 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 6 | TABLE ACCESS FULL | UET$ | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
|* 7 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 8 | VIEW | SYS_DBA_SEGS | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 9 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | 0 | | | |
| 10 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 11 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 12 | MERGE JOIN CARTESIAN | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 13 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 14 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 15 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 16 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 17 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 18 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 19 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 20 | BUFFER SORT | | 0 | 2 | 0 |00:00:00.01 | 0 | 0 | 73728 | 73728 | |
|* 21 | INDEX SKIP SCAN | I_OBJ2 | 0 | 2 | 0 |00:00:00.01 | 0 | 0 | | | |
| 22 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 23 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 24 | VIEW | SYS_OBJECTS | 0 | 5 | 0 |00:00:00.01 | 0 | 0 | | | |
| 25 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | 0 | | | |
|* 26 | TABLE ACCESS CLUSTER | TAB$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 27 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 28 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 29 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 30 | TABLE ACCESS CLUSTER | CLU$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 31 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 32 | TABLE ACCESS BY INDEX ROWID | IND$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 33 | INDEX UNIQUE SCAN | I_IND1 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 34 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 35 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 36 | TABLE ACCESS BY INDEX ROWID | LOB$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 37 | INDEX UNIQUE SCAN | I_LOB2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 38 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 39 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 40 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 41 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 42 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 43 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 44 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 45 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 46 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 47 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 48 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 49 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 50 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 51 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 52 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 53 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 54 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 55 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 56 | INDEX RANGE SCAN | I_UNDO2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 57 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 58 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 59 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 60 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 61 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 62 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 63 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 64 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 65 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 66 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 67 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 68 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 69 | HASH JOIN | | 1 | 543K| 259 |00:01:01.87 | 190K| 7157 | 1214K| 1214K| 709K (0)|
|* 70 | HASH JOIN | | 1 | 20549 | 1 |00:00:00.33 | 138K| 0 | 1969K| 1969K| 1531K (0)|
| 71 | INDEX FULL SCAN | I_FILE2 | 1 | 106 | 108 |00:00:00.01 | 1 | 0 | | | |
| 72 | VIEW | SYS_DBA_SEGS | 1 | 6785 | 1 |00:00:00.33 | 138K| 0 | | | |
| 73 | UNION-ALL | | 1 | | 1 |00:00:00.33 | 138K| 0 | | | |
| 74 | NESTED LOOPS | | 1 | 6783 | 1 |00:00:00.32 | 137K| 0 | | | |
| 75 | NESTED LOOPS OUTER | | 1 | 2 | 10578 |00:00:00.10 | 21543 | 0 | | | |
| 76 | MERGE JOIN CARTESIAN | | 1 | 2 | 10578 |00:00:00.07 | 10961 | 0 | | | |
| 77 | NESTED LOOPS | | 1 | 1 | 10578 |00:00:00.06 | 10896 | 0 | | | |
| 78 | NESTED LOOPS | | 1 | 1 | 10578 |00:00:00.03 | 314 | 0 | | | |
|* 79 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 10578 |00:00:00.02 | 310 | 0 | | | |
|* 80 | INDEX UNIQUE SCAN | I_FILE2 | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | |
| 81 | TABLE ACCESS CLUSTER | TS$ | 10578 | 1 | 10578 |00:00:00.02 | 10582 | 0 | | | |
|* 82 | INDEX UNIQUE SCAN | I_TS# | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | |
| 83 | BUFFER SORT | | 10578 | 2 | 10578 |00:00:00.01 | 65 | 0 | 2048 | 2048 | 2048 (0)|
|* 84 | INDEX SKIP SCAN | I_OBJ2 | 1 | 2 | 1 |00:00:00.01 | 65 | 0 | | | |
| 85 | TABLE ACCESS CLUSTER | USER$ | 10578 | 1 | 10578 |00:00:00.02 | 10582 | 0 | | | |
|* 86 | INDEX UNIQUE SCAN | I_USER# | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | |
|* 87 | VIEW | SYS_OBJECTS | 10578 | 2 | 1 |00:00:00.22 | 116K| 0 | | | |
| 88 | UNION ALL PUSHED PREDICATE | | 10578 | | 10578 |00:00:00.21 | 116K| 0 | | | |
|* 89 | TABLE ACCESS CLUSTER | TAB$ | 10578 | 1 | 10578 |00:00:00.03 | 21161 | 0 | | | |
|* 90 | INDEX UNIQUE SCAN | I_OBJ# | 10578 | 1 | 10578 |00:00:00.01 | 10583 | 0 | | | |
| 91 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
|* 92 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
| 93 | TABLE ACCESS CLUSTER | CLU$ | 10578 | 1 | 0 |00:00:00.02 | 21161 | 0 | | | |
|* 94 | INDEX UNIQUE SCAN | I_OBJ# | 10578 | 1 | 10578 |00:00:00.01 | 10583 | 0 | | | |
|* 95 | TABLE ACCESS BY INDEX ROWID | IND$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
|* 96 | INDEX UNIQUE SCAN | I_IND1 | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
| 97 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|* 98 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|* 99 | TABLE ACCESS BY INDEX ROWID | LOB$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
|*100 | INDEX UNIQUE SCAN | I_LOB2 | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
| 101 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|*102 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
| 103 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|*104 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
| 105 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|*106 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
| 107 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
| 108 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
| 109 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
| 110 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
|*111 | TABLE ACCESS BY INDEX ROWID| UNDO$ | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
|*112 | INDEX RANGE SCAN | I_UNDO2 | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
|*113 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*114 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*115 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 116 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*117 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 118 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*119 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 120 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 121 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 122 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 123 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
|*124 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 125 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*126 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 127 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*128 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*129 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*130 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 131 | FIXED TABLE FULL | X$KTFBUE | 1 | 100K| 723K|00:01:01.20 | 52350 | 7157 | | | |
------------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id):
--------------------------------------------------- 7 - access("E"."TS#"="F"."TS#" AND "E"."FILE#"="F"."RELFILE#")
15 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
17 - access("TS"."TS#"="E"."TS#")
18 - filter((BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
19 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#"))
21 - access("O"."NAME"='AUD$')
filter("O"."NAME"='AUD$')
23 - access("O"."OWNER#"="U"."USER#")
24 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND
"S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID"))
26 - filter(("T"."BLOCK#"="E"."SEGBLOCK#" AND "T"."FILE#"="E"."SEGFILE#" AND "T"."TS#"="E"."TS#" AND BITAND("T"."PROPERTY",1024)=0))
27 - access("T"."OBJ#"="O"."OBJ#")
28 - filter(("TP"."BLOCK#"="E"."SEGBLOCK#" AND "TP"."FILE#"="E"."SEGFILE#" AND "TP"."TS#"="E"."TS#"))
29 - access("TP"."OBJ#"="O"."OBJ#")
30 - filter(("C"."BLOCK#"="E"."SEGBLOCK#" AND "C"."FILE#"="E"."SEGFILE#" AND "C"."TS#"="E"."TS#"))
31 - access("C"."OBJ#"="O"."OBJ#")
32 - filter(("I"."BLOCK#"="E"."SEGBLOCK#" AND "I"."FILE#"="E"."SEGFILE#" AND "I"."TS#"="E"."TS#" AND INTERNAL_FUNCTION("I"."TYPE#")))
33 - access("I"."OBJ#"="O"."OBJ#")
34 - filter(("IP"."BLOCK#"="E"."SEGBLOCK#" AND "IP"."FILE#"="E"."SEGFILE#" AND "IP"."TS#"="E"."TS#"))
35 - access("IP"."OBJ#"="O"."OBJ#")
36 - filter(("L"."BLOCK#"="E"."SEGBLOCK#" AND "L"."FILE#"="E"."SEGFILE#" AND "L"."TS#"="E"."TS#" AND (BITAND("L"."PROPERTY",64)=0 OR
BITAND("L"."PROPERTY",128)=128)))
37 - access("L"."LOBJ#"="O"."OBJ#")
38 - filter(("TSP"."BLOCK#"="E"."SEGBLOCK#" AND "TSP"."FILE#"="E"."SEGFILE#" AND "TSP"."TS#"="E"."TS#"))
39 - access("TSP"."OBJ#"="O"."OBJ#")
40 - filter(("ISP"."FILE#"="E"."SEGFILE#" AND "ISP"."BLOCK#"="E"."SEGBLOCK#" AND "ISP"."TS#"="E"."TS#"))
41 - access("ISP"."OBJ#"="O"."OBJ#")
42 - filter(("LF"."BLOCK#"="E"."SEGBLOCK#" AND "LF"."FILE#"="E"."SEGFILE#" AND "LF"."TS#"="E"."TS#"))
43 - access("LF"."FRAGOBJ#"="O"."OBJ#")
49 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
51 - access("TS"."TS#"="E"."TS#")
52 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
53 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter("S"."TS#"="TS"."TS#")
55 - access("S"."USER#"="U"."USER#")
56 - access("UN"."NAME"='AUD$')
57 - filter(("UN"."BLOCK#"="E"."SEGBLOCK#" AND "UN"."FILE#"="E"."SEGFILE#" AND "UN"."TS#"="E"."TS#" AND "UN"."STATUS$"<>1 AND
"S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#" AND "S"."TS#"="UN"."TS#" AND "UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#"))
62 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
64 - access("TS"."TS#"="E"."TS#")
65 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND
"S"."TYPE#"<>10 AND "S"."TYPE#"<>1))
66 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#" AND
TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$'))
68 - access("S"."USER#"="U"."USER#")
69 - access("E"."KTFBUESEGFNO"="DS"."RELATIVE_FNO" AND "E"."KTFBUESEGBNO"="DS"."HEADER_BLOCK" AND "E"."KTFBUESEGTSN"="DS"."TABLESPACE_ID" AND
"E"."KTFBUEFNO"="F"."RELFILE#")
70 - access("DS"."TABLESPACE_ID"="F"."TS#")
79 - filter((BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
80 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")
82 - access("S"."TS#"="TS"."TS#")
84 - access("O"."NAME"='AUD$')
filter("O"."NAME"='AUD$')
86 - access("O"."OWNER#"="U"."USER#")
87 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND
"S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID"))
89 - filter(BITAND("T"."PROPERTY",1024)=0)
90 - access("T"."OBJ#"="O"."OBJ#")
92 - access("TP"."OBJ#"="O"."OBJ#")
94 - access("C"."OBJ#"="O"."OBJ#")
95 - filter(("I"."TYPE#"=1 OR "I"."TYPE#"=2 OR "I"."TYPE#"=3 OR "I"."TYPE#"=4 OR "I"."TYPE#"=6 OR "I"."TYPE#"=7 OR "I"."TYPE#"=8 OR
"I"."TYPE#"=9))
96 - access("I"."OBJ#"="O"."OBJ#")
98 - access("IP"."OBJ#"="O"."OBJ#")
99 - filter((BITAND("L"."PROPERTY",64)=0 OR BITAND("L"."PROPERTY",128)=128))
100 - access("L"."LOBJ#"="O"."OBJ#")
102 - access("TSP"."OBJ#"="O"."OBJ#")
104 - access("ISP"."OBJ#"="O"."OBJ#")
106 - access("LF"."FRAGOBJ#"="O"."OBJ#")
111 - filter("UN"."STATUS$"<>1)
112 - access("UN"."NAME"='AUD$')
113 - access("UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#")
114 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
115 - access("S"."TS#"="UN"."TS#" AND "S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#")
117 - access("S"."TS#"="TS"."TS#")
119 - access("S"."USER#"="U"."USER#")
124 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND
"S"."TYPE#"<>10 AND "S"."TYPE#"<>1))
126 - access("S"."TS#"="TS"."TS#")
128 - access("S"."USER#"="U"."USER#")
129 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")
130 - filter(TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$') 232 rows selected. Elapsed: 00:00:00.10
直接看id=131的那一行，时间都花在对固定表X$KTFBUE的全表扫描上，这个算是Oracle的一个BUG，当该固定表没有统计信息的时候，Oracle不会对他做动态采样，而是直接使用基数为100000的行。
查看索引的信息，固定表的索引有点奇怪：
SYS@zkm1> select * from V$INDEXED_FIXED_COLUMN where table_name='X$KTFBUE'; TABLE_NAME INDEX_NUMBER COLUMN_NAME COLUMN_POSITION
------------------------------ ------------ ------------------------------ ---------------
X$KTFBUE 1 KTFBUESEGBNO 2
X$KTFBUE 1 KTFBUESEGFNO 1
X$KTFBUE 1 KTFBUESEGTSN 0
看不出啥。
百度或者mos上都可以查找到相关的原因和办法。
mos参考文档：Query Against DBA_EXTENTS Performs Slowly After Upgrade to 11.2.0.3 (Doc ID 1453425.1)
这篇文章有提供几种方法。
Gathering stats on the X$KTFBUE table using the following command:
EXEC DBMS_STATS.GATHER_TABLE_STATS('SYS', 'X$KTFBUE');For more information on gathering fixed table statistics see:
Document 798257.1 GATHER_FIXED_OBJECTS_STATS ConsiderationsOR
alter session set "_optimizer_cartesian_enabled" = false;OR
alter session set "_smm_auto_cost_enabled" = false;OR
Disable fix for unpublished Bug Bug 11814428: POOR CARDINALITY ESTIMATE FROM JOIN WITH A UNION-ALL VIEW:
alter session set "_FIX_CONTROL" = "11814428:0";
不过只有收集统计信息和最下边的BUG修复关掉才有效。
收集统计信息这个方法略过，因为还有一个表空间查询缓慢的问题和这个是一样的问题。
我们采用另外一种方法，关闭11814428的修复，执行：
20:30:19 SYS@anonymous> alter session set "_FIX_CONTROL" = "11814428:0"; Session altered. Elapsed: 00:00:00.00
之后再次运行变快了：
20:30:21 SYS@anonymous> select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name; OWNER TABLESPACE_NAME
------------------------------ ------------------------------
SYS SYSTEM Elapsed: 00:00:00.33
可以发现执行计划对X$KTFBUE已经采用了索引：
20:30:28 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID dggb0d96bj8dy, child number 5
-------------------------------------
select owner,tablespace_name from dba_extents where segment_name='AUD$'
group by owner,tablespace_name Plan hash value: 381184789 ------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem |
------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | 1 |00:00:00.01 | 719 | | | |
| 1 | HASH GROUP BY | | 1 | 729 | 1 |00:00:00.01 | 719 | 1646K| 1646K| 497K (0)|
| 2 | VIEW | DBA_EXTENTS | 1 | 729 | 259 |00:00:00.01 | 719 | | | |
| 3 | UNION-ALL | | 1 | | 259 |00:00:00.01 | 719 | | | |
| 4 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 5 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 6 | TABLE ACCESS FULL | UET$ | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
|* 7 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 8 | VIEW | SYS_DBA_SEGS | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 9 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | | | |
| 10 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 11 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 12 | MERGE JOIN CARTESIAN | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 13 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 14 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 15 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 16 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 17 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 18 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 19 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 20 | BUFFER SORT | | 0 | 2 | 0 |00:00:00.01 | 0 | 73728 | 73728 | |
|* 21 | INDEX SKIP SCAN | I_OBJ2 | 0 | 2 | 0 |00:00:00.01 | 0 | | | |
| 22 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 23 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 24 | VIEW | SYS_OBJECTS | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 25 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | | | |
|* 26 | TABLE ACCESS CLUSTER | TAB$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 27 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 28 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 29 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 30 | TABLE ACCESS CLUSTER | CLU$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 31 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 32 | TABLE ACCESS BY INDEX ROWID | IND$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 33 | INDEX UNIQUE SCAN | I_IND1 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 34 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 35 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 36 | TABLE ACCESS BY INDEX ROWID | LOB$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 37 | INDEX UNIQUE SCAN | I_LOB2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 38 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 39 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 40 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 41 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 42 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 43 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 44 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 45 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 46 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 47 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 48 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 49 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 50 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 51 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 52 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 53 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 54 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 55 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 56 | INDEX RANGE SCAN | I_UNDO2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 57 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 58 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 59 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 60 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 61 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 62 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 63 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 64 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 65 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 66 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 67 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 68 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 69 | HASH JOIN | | 1 | 728 | 259 |00:00:00.01 | 409 | 1969K| 1969K| 1497K (0)|
| 70 | INDEX FULL SCAN | I_FILE2 | 1 | 106 | 108 |00:00:00.01 | 1 | | | |
| 71 | NESTED LOOPS | | 1 | 24769 | 259 |00:00:00.01 | 408 | | | |
| 72 | VIEW | SYS_DBA_SEGS | 1 | 3 | 1 |00:00:00.01 | 401 | | | |
| 73 | UNION-ALL | | 1 | | 1 |00:00:00.01 | 401 | | | |
| 74 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 89 | | | |
| 75 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 87 | | | |
| 76 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 86 | | | |
| 77 | NESTED LOOPS OUTER | | 1 | 1 | 1 |00:00:00.01 | 83 | | | |
| 78 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 81 | | | |
|* 79 | INDEX SKIP SCAN | I_OBJ2 | 1 | 2 | 1 |00:00:00.01 | 65 | | | |
|* 80 | VIEW | SYS_OBJECTS | 1 | 1 | 1 |00:00:00.01 | 16 | | | |
| 81 | UNION ALL PUSHED PREDICATE | | 1 | | 1 |00:00:00.01 | 16 | | | |
|* 82 | TABLE ACCESS CLUSTER | TAB$ | 1 | 1 | 1 |00:00:00.01 | 3 | | | |
|* 83 | INDEX UNIQUE SCAN | I_OBJ# | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
| 84 | TABLE ACCESS BY INDEX ROWID| TABPART$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|* 85 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 86 | TABLE ACCESS CLUSTER | CLU$ | 1 | 1 | 0 |00:00:00.01 | 3 | | | |
|* 87 | INDEX UNIQUE SCAN | I_OBJ# | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
|* 88 | TABLE ACCESS BY INDEX ROWID| IND$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|* 89 | INDEX UNIQUE SCAN | I_IND1 | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 90 | TABLE ACCESS BY INDEX ROWID| INDPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 91 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 92 | TABLE ACCESS BY INDEX ROWID| LOB$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|* 93 | INDEX UNIQUE SCAN | I_LOB2 | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 94 | TABLE ACCESS BY INDEX ROWID| TABSUBPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 95 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
| 96 | TABLE ACCESS BY INDEX ROWID| INDSUBPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 97 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
| 98 | TABLE ACCESS BY INDEX ROWID| LOBFRAG$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 99 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
| 100 | TABLE ACCESS CLUSTER | USER$ | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
|*101 | INDEX UNIQUE SCAN | I_USER# | 1 | 1 | 1 |00:00:00.01 | 1 | | | |
|*102 | TABLE ACCESS CLUSTER | SEG$ | 1 | 1 | 1 |00:00:00.01 | 3 | | | |
|*103 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
|*104 | INDEX UNIQUE SCAN | I_FILE2 | 1 | 1 | 1 |00:00:00.01 | 1 | | | |
| 105 | TABLE ACCESS CLUSTER | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
|*106 | INDEX UNIQUE SCAN | I_TS# | 1 | 1 | 1 |00:00:00.01 | 1 | | | |
| 107 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 108 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 109 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 110 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|*111 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|*112 | INDEX RANGE SCAN | I_UNDO2 | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|*113 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*114 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*115 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 116 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*117 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 118 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*119 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 120 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 121 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 122 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 123 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
|*124 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 125 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*126 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 127 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*128 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*129 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*130 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*131 | FIXED TABLE FIXED INDEX | X$KTFBUE (ind:1) | 1 | 8256 | 259 |00:00:00.01 | 7 | | | |
------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id):
--------------------------------------------------- 7 - access("E"."TS#"="F"."TS#" AND "E"."FILE#"="F"."RELFILE#")
15 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
17 - access("TS"."TS#"="E"."TS#")
18 - filter((BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
19 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#"))
21 - access("O"."NAME"='AUD$')
filter("O"."NAME"='AUD$')
23 - access("O"."OWNER#"="U"."USER#")
24 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND
"S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID"))
26 - filter(("T"."BLOCK#"="E"."SEGBLOCK#" AND "T"."FILE#"="E"."SEGFILE#" AND "T"."TS#"="E"."TS#" AND BITAND("T"."PROPERTY",1024)=0))
27 - access("T"."OBJ#"="O"."OBJ#")
28 - filter(("TP"."BLOCK#"="E"."SEGBLOCK#" AND "TP"."FILE#"="E"."SEGFILE#" AND "TP"."TS#"="E"."TS#"))
29 - access("TP"."OBJ#"="O"."OBJ#")
30 - filter(("C"."BLOCK#"="E"."SEGBLOCK#" AND "C"."FILE#"="E"."SEGFILE#" AND "C"."TS#"="E"."TS#"))
31 - access("C"."OBJ#"="O"."OBJ#")
32 - filter(("I"."BLOCK#"="E"."SEGBLOCK#" AND "I"."FILE#"="E"."SEGFILE#" AND "I"."TS#"="E"."TS#" AND INTERNAL_FUNCTION("I"."TYPE#")))
33 - access("I"."OBJ#"="O"."OBJ#")
34 - filter(("IP"."BLOCK#"="E"."SEGBLOCK#" AND "IP"."FILE#"="E"."SEGFILE#" AND "IP"."TS#"="E"."TS#"))
35 - access("IP"."OBJ#"="O"."OBJ#")
36 - filter(("L"."BLOCK#"="E"."SEGBLOCK#" AND "L"."FILE#"="E"."SEGFILE#" AND "L"."TS#"="E"."TS#" AND (BITAND("L"."PROPERTY",64)=0 OR
BITAND("L"."PROPERTY",128)=128)))
37 - access("L"."LOBJ#"="O"."OBJ#")
38 - filter(("TSP"."BLOCK#"="E"."SEGBLOCK#" AND "TSP"."FILE#"="E"."SEGFILE#" AND "TSP"."TS#"="E"."TS#"))
39 - access("TSP"."OBJ#"="O"."OBJ#")
40 - filter(("ISP"."FILE#"="E"."SEGFILE#" AND "ISP"."BLOCK#"="E"."SEGBLOCK#" AND "ISP"."TS#"="E"."TS#"))
41 - access("ISP"."OBJ#"="O"."OBJ#")
42 - filter(("LF"."BLOCK#"="E"."SEGBLOCK#" AND "LF"."FILE#"="E"."SEGFILE#" AND "LF"."TS#"="E"."TS#"))
43 - access("LF"."FRAGOBJ#"="O"."OBJ#")
49 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
51 - access("TS"."TS#"="E"."TS#")
52 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
53 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter("S"."TS#"="TS"."TS#")
55 - access("S"."USER#"="U"."USER#")
56 - access("UN"."NAME"='AUD$')
57 - filter(("UN"."BLOCK#"="E"."SEGBLOCK#" AND "UN"."FILE#"="E"."SEGFILE#" AND "UN"."TS#"="E"."TS#" AND "UN"."STATUS$"<>1 AND
"S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#" AND "S"."TS#"="UN"."TS#" AND "UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#"))
62 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
64 - access("TS"."TS#"="E"."TS#")
65 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=0 AND
BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"<>10 AND "S"."TYPE#"<>1))
66 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#" AND
TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$'))
68 - access("S"."USER#"="U"."USER#")
69 - access("DS"."TABLESPACE_ID"="F"."TS#" AND "E"."KTFBUEFNO"="F"."RELFILE#")
79 - access("O"."NAME"='AUD$')
filter("O"."NAME"='AUD$')
80 - filter("O"."TYPE#"="SO"."OBJECT_TYPE_ID")
82 - filter(BITAND("T"."PROPERTY",1024)=0)
83 - access("T"."OBJ#"="O"."OBJ#")
85 - access("TP"."OBJ#"="O"."OBJ#")
87 - access("C"."OBJ#"="O"."OBJ#")
88 - filter(("I"."TYPE#"=1 OR "I"."TYPE#"=2 OR "I"."TYPE#"=3 OR "I"."TYPE#"=4 OR "I"."TYPE#"=6 OR "I"."TYPE#"=7 OR "I"."TYPE#"=8 OR
"I"."TYPE#"=9))
89 - access("I"."OBJ#"="O"."OBJ#")
91 - access("IP"."OBJ#"="O"."OBJ#")
92 - filter((BITAND("L"."PROPERTY",64)=0 OR BITAND("L"."PROPERTY",128)=128))
93 - access("L"."LOBJ#"="O"."OBJ#")
95 - access("TSP"."OBJ#"="O"."OBJ#")
97 - access("ISP"."OBJ#"="O"."OBJ#")
99 - access("LF"."FRAGOBJ#"="O"."OBJ#")
101 - access("O"."OWNER#"="U"."USER#")
102 - filter((BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"="SO"."SEGMENT_TYPE_ID"))
103 - access("S"."TS#"="SO"."TS_NUMBER" AND "S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK")
104 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")
106 - access("S"."TS#"="TS"."TS#")
111 - filter("UN"."STATUS$"<>1)
112 - access("UN"."NAME"='AUD$')
113 - access("UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#")
114 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
115 - access("S"."TS#"="UN"."TS#" AND "S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#")
117 - access("S"."TS#"="TS"."TS#")
119 - access("S"."USER#"="U"."USER#")
124 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=1 AND
BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"<>10 AND "S"."TYPE#"<>1))
126 - access("S"."TS#"="TS"."TS#")
128 - access("S"."USER#"="U"."USER#")
129 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")
130 - filter(TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$')
131 - filter(("E"."KTFBUESEGFNO"="DS"."RELATIVE_FNO" AND "E"."KTFBUESEGBNO"="DS"."HEADER_BLOCK" AND "E"."KTFBUESEGTSN"="DS"."TABLESPACE_ID")) 231 rows selected. Elapsed: 00:00:00.15
在查询表空间的时候，执行alter session set "_FIX_CONTROL" = "11814428:0";后，X$KTFBUE还是走全表扫描：
（表空间名字做处理）
20:32:05 SYS@eportdbi1> SELECT a.tablespace_name,
20:32:05 2 ROUND (a.bytes_alloc / 1024 / 1024, 2) megs_alloc,
20:32:05 3 ROUND (NVL (b.bytes_free, 0) / 1024 / 1024, 2) megs_free,
20:32:05 4 ROUND ((a.bytes_alloc - NVL (b.bytes_free, 0)) / 1024 / 1024, 2 ) megs_used,
20:32:05 5 ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_free,
20:32:05 6 100 - ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_used,
20:32:05 7 ROUND (maxbytes / 1048576, 2) MAX
20:32:05 8 FROM
20:32:05 9 (SELECT f.tablespace_name,
20:32:05 10 SUM (f.BYTES) bytes_alloc,
20:32:05 11 SUM (DECODE (f.autoextensible, 'YES', f.maxbytes, 'NO', f.BYTES ) ) maxbytes
20:32:05 12 FROM dba_data_files f
20:32:05 13 GROUP BY tablespace_name
20:32:05 14 ) a,
20:32:05 15 (SELECT f.tablespace_name,
20:32:05 16 SUM (f.BYTES) bytes_free
20:32:05 17 FROM dba_free_space f
20:32:05 18 GROUP BY tablespace_name
20:32:05 19 ) b
20:32:05 20 WHERE a.tablespace_name = b.tablespace_name(+)
20:32:05 21 UNION ALL
20:32:05 22 SELECT h.tablespace_name,
20:32:05 23 ROUND (SUM (h.bytes_free + h.bytes_used) / 1048576, 2) megs_alloc,
20:32:05 24 ROUND ( SUM ((h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0)) / 1048576, 2 ) megs_free,
20:32:05 25 ROUND (SUM (NVL (p.bytes_used, 0)) / 1048576, 2) megs_used,
20:32:05 26 ROUND ( ( SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0) ) / SUM (h.bytes_used + h.bytes_free) ) * 100, 2 ) pct_free,
20:32:05 27 100 - ROUND ( ( SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0) ) / SUM (h.bytes_used + h.bytes_free) ) * 100, 2 ) pct_used,
20:32:05 28 ROUND (SUM (f.maxbytes) / 1048576, 2) MAX
20:32:05 29 FROM SYS.v_$temp_space_header h,
20:32:05 30 SYS.v_$temp_extent_pool p,
20:32:05 31 dba_temp_files f
20:32:05 32 WHERE p.file_id(+) = h.file_id
20:32:06 33 AND p.tablespace_name(+) = h.tablespace_name
20:32:06 34 AND f.file_id = h.file_id
20:32:06 35 AND f.tablespace_name = h.tablespace_name
20:32:06 36 GROUP BY h.tablespace_name
20:32:06 37 ORDER BY 1 ; TABLESPACE_NAME MEGS_ALLOC MEGS_FREE MEGS_USED PCT_FREE PCT_USED MAX
------------------------------ ---------- ---------- ---------- ---------- ---------- ----------
xxxxxxxxxxxxxxxx 4096 4019 77 98.12 1.88 4096
xxxxxxxxxxxxxxxx 8192 2283 5909 27.87 72.13 8192
xxxxxxxxxxxxxxxx 2048 1113 935 54.35 45.65 2048
xxxxxxxxxxxxxxxx 24576 16092 8484 65.48 34.52 24576
xxxxxxxxxxxxxxxx 4096 4095 1 99.98 .02 4096
xxxxxxxxxxxxxxxx 8192 8187 5 99.94 .06 8192
xxxxxxxxxxxxxxxx 4000 3373 627 84.33 15.67 4000
xxxxxxxxxxxxxxxx 546304 346561 199743 63.44 36.56 546304
xxxxxxxxxxxxxxxx 4096 2969 1127 72.49 27.51 4096
xxxxxxxxxxxxxxxx 4096 4086 10 99.76 .24 4096
xxxxxxxxxxxxxxxx 8192 3047 5145 37.19 62.81 8192
xxxxxxxxxxxxxxxx 276608 77078 199530 27.87 72.13 276608
xxxxxxxxxxxxxxxx 16384 8605 7779 52.52 47.48 16384
xxxxxxxxxxxxxxxx 4096 2944 1152 71.88 28.12 4096
xxxxxxxxxxxxxxxx 16384 3575 12809 21.82 78.18 16384
xxxxxxxxxxxxxxxx 4096 1074 3022 26.22 73.78 4096
xxxxxxxxxxxxxxxx 4096 4071 25 99.39 .61 4096
xxxxxxxxxxxxxxxx 4096 3915 181 95.58 4.42 4096
xxxxxxxxxxxxxxxx 16384 15984 400 97.56 2.44 16384
xxxxxxxxxxxxxxxx 32760 8390.88 24369.13 25.61 74.39 32767.98
xxxxxxxxxxxxxxxx 5360 34.13 5325.88 .64 99.36 32767.98
xxxxxxxxxxxxxxxx 4096 2946 1150 71.92 28.08 4096
xxxxxxxxxxxxxxxx 4096 4052 44 98.93 1.07 4096
xxxxxxxxxxxxxxxx 20096 13860 6236 68.97 31.03 20096
xxxxxxxxxxxxxxxx 16384 13068 3316 79.76 20.24 16384
xxxxxxxxxxxxxxxx 208192 40933 167259 19.66 80.34 208192
xxxxxxxxxxxxxxxx 20096 16143 3953 80.33 19.67 20096
xxxxxxxxxxxxxxxx 2048 1898 150 92.68 7.32 2048
xxxxxxxxxxxxxxxx 20096 16138 3958 80.3 19.7 20096
xxxxxxxxxxxxxxxx 68096 13300 54796 19.53 80.47 68096
xxxxxxxxxxxxxxxx 8192 8179 13 99.84 .16 8192
xxxxxxxxxxxxxxxx 32767 31971 796 97.57 2.43 32767.98
xxxxxxxxxxxxxxxx 10240 2371.75 7868.25 23.16 76.84 10240
xxxxxxxxxxxxxxxx 10390 9292.25 1097.75 89.43 10.57 32767.98
xxxxxxxxxxxxxxxx 4356.25 209.38 4146.88 4.81 95.19 32767.98 35 rows selected. Elapsed: 00:01:54.62
执行计划：
20:34:00 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID 8ks58zbpgra00, child number 1
-------------------------------------
SELECT a.tablespace_name, ROUND (a.bytes_alloc / 1024 /
1024, 2) megs_alloc, ROUND (NVL (b.bytes_free, 0) / 1024 / 1024, 2)
megs_free, ROUND ((a.bytes_alloc - NVL (b.bytes_free, 0)) /
1024 / 1024, 2 ) megs_used, ROUND ((NVL (b.bytes_free, 0) /
a.bytes_alloc) * 100, 2) pct_free, 100 -
ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_used,
ROUND (maxbytes / 1048576, 2) MAX FROM (SELECT
f.tablespace_name, SUM (f.BYTES) bytes_alloc, SUM (DECODE
(f.autoextensible, 'YES', f.maxbytes, 'NO', f.BYTES ) ) maxbytes FROM
dba_data_files f GROUP BY tablespace_name ) a, (SELECT
f.tablespace_name, SUM (f.BYTES) bytes_free FROM dba_free_space f
GROUP BY tablespace_name ) b WHERE a.tablespace_name =
b.tablespace_name(+) UNION ALL SELECT h.tablespace_name, ROUND (SUM
(h.bytes_free + h.bytes_used) / 1048576, 2) megs_alloc,
ROUND ( SUM ((h.bytes_free + h.bytes_used) - NVL (p.b Plan hash value: 2506036241 ------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem |
------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | 35 |00:01:54.53 | 53354 | 4865 | | | |
| 1 | SORT ORDER BY | | 1 | 3 | 35 |00:01:54.53 | 53354 | 4865 | 4096 | 4096 | 4096 (0)|
| 2 | UNION-ALL | | 1 | | 35 |00:01:54.53 | 53354 | 4865 | | | |
|* 3 | HASH JOIN OUTER | | 1 | 2 | 34 |00:01:54.18 | 53310 | 4865 | 1229K| 1229K| 1243K (0)|
| 4 | VIEW | | 1 | 2 | 34 |00:00:00.66 | 444 | 0 | | | |
| 5 | HASH GROUP BY | | 1 | 2 | 34 |00:00:00.66 | 444 | 0 | 941K| 941K| 1349K (0)|
| 6 | VIEW | DBA_DATA_FILES | 1 | 2 | 108 |00:00:00.65 | 444 | 0 | | | |
| 7 | UNION-ALL | | 1 | | 108 |00:00:00.65 | 444 | 0 | | | |
| 8 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | |
| 9 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | |
| 10 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | |
|* 11 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 108 |00:00:00.57 | 0 | 0 | | | |
|* 12 | TABLE ACCESS BY INDEX ROWID| FILE$ | 108 | 1 | 0 |00:00:00.01 | 112 | 0 | | | |
|* 13 | INDEX UNIQUE SCAN | I_FILE1 | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | |
|* 14 | FIXED TABLE FIXED INDEX | X$KCCFE (ind:1) | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 15 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 16 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 17 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.08 | 332 | 0 | | | |
| 18 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.08 | 220 | 0 | | | |
| 19 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.01 | 220 | 0 | | | |
| 20 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.01 | 108 | 0 | | | |
|* 21 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 108 |00:00:00.01 | 0 | 0 | | | |
|* 22 | FIXED TABLE FIXED INDEX | X$KTFBHC (ind:1) | 108 | 1 | 108 |00:00:00.01 | 108 | 0 | | | |
|* 23 | TABLE ACCESS BY INDEX ROWID| FILE$ | 108 | 1 | 108 |00:00:00.01 | 112 | 0 | | | |
|* 24 | INDEX UNIQUE SCAN | I_FILE1 | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | |
|* 25 | FIXED TABLE FIXED INDEX | X$KCCFE (ind:1) | 108 | 1 | 108 |00:00:00.08 | 0 | 0 | | | |
| 26 | TABLE ACCESS CLUSTER | TS$ | 108 | 1 | 108 |00:00:00.01 | 112 | 0 | | | |
|* 27 | INDEX UNIQUE SCAN | I_TS# | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | |
| 28 | VIEW | | 1 | 31 | 34 |00:01:53.52 | 52866 | 4865 | | | |
| 29 | HASH GROUP BY | | 1 | 31 | 34 |00:01:53.52 | 52866 | 4865 | 9291K| 2834K| 1346K (0)|
| 30 | VIEW | DBA_FREE_SPACE | 1 | 140 | 100K|00:01:53.50 | 52866 | 4865 | | | |
| 31 | UNION-ALL | | 1 | | 100K|00:01:53.48 | 52866 | 4865 | | | |
| 32 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
| 33 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
| 34 | TABLE ACCESS FULL | FET$ | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
|* 35 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 36 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 37 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 38 | NESTED LOOPS | | 1 | 88 | 84440 |00:00:00.15 | 394 | 0 | | | |
| 39 | NESTED LOOPS | | 1 | 88 | 84440 |00:00:00.06 | 390 | 0 | | | |
|* 40 | TABLE ACCESS FULL | TS$ | 1 | 31 | 34 |00:00:00.01 | 38 | 0 | | | |
|* 41 | FIXED TABLE FIXED INDEX | X$KTFBFE (ind:1) | 34 | 3 | 84440 |00:00:00.05 | 352 | 0 | | | |
|* 42 | INDEX UNIQUE SCAN | I_FILE2 | 84440 | 1 | 84440 |00:00:00.06 | 4 | 0 | | | |
|* 43 | HASH JOIN | | 1 | 50 | 16133 |00:01:53.30 | 52396 | 4865 | 2297K| 2297K| 2426K (0)|
| 44 | NESTED LOOPS | | 1 | 50 | 16133 |00:01:53.29 | 52358 | 4865 | | | |
|* 45 | HASH JOIN | | 1 | 808 | 16133 |00:01:53.26 | 52354 | 4865 | 1753K| 1753K| 1511K (0)|
|* 46 | TABLE ACCESS FULL | RECYCLEBIN$ | 1 | 152 | 191 |00:00:00.01 | 4 | 0 | | | |
| 47 | FIXED TABLE FULL | X$KTFBUE | 1 | 100K| 723K|00:01:52.95 | 52350 | 4865 | | | |
|* 48 | INDEX UNIQUE SCAN | I_FILE2 | 16133 | 1 | 16133 |00:00:00.01 | 4 | 0 | | | |
|* 49 | TABLE ACCESS FULL | TS$ | 1 | 31 | 34 |00:00:00.01 | 38 | 0 | | | |
| 50 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
| 51 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
| 52 | MERGE JOIN CARTESIAN | | 1 | 425 | 0 |00:00:00.01 | 38 | 0 | | | |
|* 53 | TABLE ACCESS FULL | TS$ | 1 | 3 | 0 |00:00:00.01 | 38 | 0 | | | |
| 54 | BUFFER SORT | | 0 | 152 | 0 |00:00:00.01 | 0 | 0 | 73728 | 73728 | |
|* 55 | TABLE ACCESS FULL | RECYCLEBIN$ | 0 | 152 | 0 |00:00:00.01 | 0 | 0 | | | |
| 56 | TABLE ACCESS CLUSTER | UET$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 57 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 58 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 59 | HASH GROUP BY | | 1 | 1 | 1 |00:00:00.35 | 44 | 0 | 856K| 856K| 463K (0)|
| 60 | NESTED LOOPS OUTER | | 1 | 1 | 1 |00:00:00.35 | 44 | 0 | | | |
|* 61 | HASH JOIN | | 1 | 1 | 1 |00:00:00.35 | 42 | 0 | 1281K| 1281K| 402K (0)|
| 62 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 3 | 0 | | | |
| 63 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 1 | 0 | | | |
| 64 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 0 | 0 | | | |
|* 65 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 1 |00:00:00.34 | 0 | 0 | | | |
|* 66 | FIXED TABLE FIXED INDEX | X$KCCTF (ind:1) | 1 | 1 | 1 |00:00:00.01 | 0 | 0 | | | |
|* 67 | FIXED TABLE FIXED INDEX | X$KTFTHC (ind:1) | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | |
| 68 | TABLE ACCESS CLUSTER | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | |
|* 69 | INDEX UNIQUE SCAN | I_TS# | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | |
| 70 | VIEW | V_$TEMP_SPACE_HEADER | 1 | 1 | 1 |00:00:00.01 | 39 | 0 | | | |
| 71 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 39 | 0 | | | |
|* 72 | TABLE ACCESS FULL | TS$ | 1 | 1 | 1 |00:00:00.01 | 38 | 0 | | | |
|* 73 | FIXED TABLE FIXED INDEX | X$KTFTHC (ind:2) | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | |
|* 74 | VIEW PUSHED PREDICATE | V_$TEMP_EXTENT_POOL | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | |
| 75 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | |
|* 76 | TABLE ACCESS BY INDEX ROWID | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | |
|* 77 | INDEX UNIQUE SCAN | I_TS1 | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | |
|* 78 | FIXED TABLE FIXED INDEX | X$KTSTFC (ind:1) | 1 | 1 | 1 |00:00:00.01 | 0 | 0 | | | |
------------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id):
--------------------------------------------------- 3 - access("A"."TABLESPACE_NAME"="B"."TABLESPACE_NAME")
11 - filter(("FNNAM" IS NOT NULL AND "FNTYP"=4 AND "INST_ID"=USERENV('INSTANCE') AND BITAND("FNFLG",4)<>4))
12 - filter("F"."SPARE1" IS NULL)
13 - access("FNFNO"="F"."FILE#")
14 - filter("FE"."FENUM"="F"."FILE#")
16 - access("F"."TS#"="TS"."TS#")
21 - filter(("FNNAM" IS NOT NULL AND "FNTYP"=4 AND "INST_ID"=USERENV('INSTANCE') AND BITAND("FNFLG",4)<>4))
22 - filter("FNFNO"="HC"."KTFBHCAFNO")
23 - filter("F"."SPARE1" IS NOT NULL)
24 - access("FNFNO"="F"."FILE#")
25 - filter("FE"."FENUM"="F"."FILE#")
27 - access("HC"."KTFBHCTSN"="TS"."TS#")
35 - filter("TS"."BITMAPPED"=0)
36 - access("TS"."TS#"="F"."TS#")
37 - access("F"."TS#"="FI"."TS#" AND "F"."FILE#"="FI"."RELFILE#")
40 - filter(("TS"."BITMAPPED"<>0 AND "TS"."CONTENTS$"=0 AND INTERNAL_FUNCTION("TS"."ONLINE$")))
41 - filter("TS"."TS#"="F"."KTFBFETSN")
42 - access("F"."KTFBFETSN"="FI"."TS#" AND "F"."KTFBFEFNO"="FI"."RELFILE#")
43 - access("TS"."TS#"="RB"."TS#")
45 - access("U"."KTFBUESEGTSN"="RB"."TS#" AND "U"."KTFBUESEGFNO"="RB"."FILE#" AND "U"."KTFBUESEGBNO"="RB"."BLOCK#")
46 - filter(("RB"."TS#" IS NOT NULL AND "RB"."FILE#" IS NOT NULL AND "RB"."BLOCK#" IS NOT NULL))
48 - access("RB"."TS#"="FI"."TS#" AND "U"."KTFBUEFNO"="FI"."RELFILE#")
49 - filter(("TS"."BITMAPPED"<>0 AND "TS"."CONTENTS$"=0 AND INTERNAL_FUNCTION("TS"."ONLINE$")))
53 - filter("TS"."BITMAPPED"=0)
55 - filter(("RB"."TS#" IS NOT NULL AND "RB"."FILE#" IS NOT NULL AND "RB"."BLOCK#" IS NOT NULL))
57 - access("U"."TS#"="RB"."TS#" AND "U"."SEGFILE#"="RB"."FILE#" AND "U"."SEGBLOCK#"="RB"."BLOCK#")
filter("TS"."TS#"="U"."TS#")
58 - access("U"."TS#"="FI"."TS#" AND "U"."SEGFILE#"="FI"."RELFILE#")
61 - access("HC"."KTFTHCTFNO"="H"."FILE_ID" AND "TS"."NAME"="H"."TABLESPACE_NAME")
65 - filter(("V"."FNNAM" IS NOT NULL AND "V"."FNTYP"=7))
66 - filter(("TF"."TFDUP"<>0 AND BITAND("TF"."TFSTA",32)<>32 AND "V"."FNFNO"="TF"."TFNUM" AND "TF"."TFFNH"="V"."FNNUM"))
67 - filter("V"."FNFNO"="HC"."KTFTHCTFNO")
69 - access("HC"."KTFTHCTSN"="TS"."TS#")
72 - filter(("TS"."CONTENTS$"=1 AND "TS"."BITMAPPED"<>0 AND "TS"."ONLINE$"=1))
73 - filter(("HC"."KTFTHCCVAL"=0 AND "HC"."INST_ID"=USERENV('INSTANCE') AND "TS"."TS#"="HC"."KTFTHCTSN"))
74 - filter("P"."FILE_ID"="H"."FILE_ID")
76 - filter(("TS"."CONTENTS$"=1 AND "TS"."BITMAPPED"<>0 AND "TS"."ONLINE$"=1))
77 - access("TS"."NAME"="H"."TABLESPACE_NAME")
78 - filter(("FC"."INST_ID"=USERENV('INSTANCE') AND "TS"."TS#"="FC"."KTSTFCTSN")) 147 rows selected. Elapsed: 00:00:00.08
解决可以看我另外一篇博文：Oracle查询表空间使用率很慢
Oracle查询dba_extents视图很慢的更多相关文章
- Oracle 查询权限视图
在Oracle中有很多用于查权限的视图,但很多人在需要查权限时会很困惑,不知道该用哪个视图去查,这里我列出几个常见的用于查权限的视图及其用法: 1DBA_ROLE_PRIVS 该视图主要有以下2个作用 ...
- Oracle查询表空间使用率很慢
Oracle查询表空间使用率很慢 问题描述 执行查询表空间的语句,需要接近2min的时间才能执行完成. 以前也在其他客户的生产库遇到过一样的情况,当时是由于回收站的内容过多引起的. 不过这次的情况却不 ...
- 45个很实用的 Oracle 查询语句小结
这里我们介绍的是 40+ 个很实用的 Oracle 查询语句,主要涵盖了日期操作,获取server信息.获取运行状态.计算数据库大小等等方面的查询. 这些是全部 Oracle 开发人员都必备的技 ...
- 45 个非常有用的 Oracle 查询语句
这里我们介绍的是 40+ 个非常有用的 Oracle 查询语句,主要涵盖了日期操作,获取服务器信息,获取执行状态,计算数据库大小等等方面的查询.这些是所有 Oracle 开发者都必备的技能,所以快 ...
- Oracle之物化视图
来源于:http://www.cnblogs.com/Ronger/archive/2012/03/28/2420962.html 近期根据项目业务需要对oracle的物化视图有所接触,在网上搜寻关于 ...
- 《oracle每天一练》Oracle之物化视图
相关帖子思考和跟踪 本文转自Ronger 物化视图是一种特殊的物理表,“物化”(Materialized)视图是相对普通视图而言的.普通视图是虚拟表,应用的局限性大,任何对视图的查询,Oracle都实 ...
- 40多个非常有用的Oracle 查询语句
给大家介绍是40多个非常有用的Oracle 查询语句,主要涵盖了日期操作,获取服务器信息,获取执行状态,计算数据库大小等等方面的查询.这些是所有Oracle 开发者都必备的技能,所以快快收藏吧! 日期 ...
- Oracle数据库学习 视图、序列及存储过程
视图(View) 视图也被称作虚表,也就是虚拟的表,是一组数据的逻辑表示. 视图对应一个select语句,结果集被赋予一个名字,也就是视图的名字. 视图本身不包含任何数据,它只是包含映射到基表的一个查 ...
- 45个非常有用的 Oracle 查询语句小结
45个非常有用的 Oracle 查询语句小结 这里我们介绍的是 40+ 个非常有用的 Oracle 查询语句,主要涵盖了日期操作,获取服务器信息,获取执行状态,计算数据库大小等等方面的查询.这些是所有 ...
随机推荐
- java实现求二十一位水仙花数（21位水仙花数）
一个N位的十进制正整数,如果它的每个位上的数字的N次方的和等于这个数本身,则称其为花朵数. 例如: 当N=3时,153就满足条件,因为 1^3 + 5^3 + 3^3 = 153,这样的数字也被称为水 ...
- java实现第五届蓝桥杯信号匹配
信号匹配 从X星球接收了一个数字信号序列. 现有一个已知的样板序列.需要在信号序列中查找它首次出现的位置.这类似于串的匹配操作. 如果信号序列较长,样板序列中重复数字较多,就应当注意比较的策略了.可以 ...
- Dockerfile 解析
Dockerfile Dockerfile是用来构建Docker镜像的构建文件,是由一系列参数和命令构成的脚本. 构建的三个步骤:1.编写Dockerfile文件 2.docker build 3 ...
- BFART算法
参考:https://zhuanlan.zhihu.com/p/31498036 https://www.jianshu.com/p/83bb10ad1d32
- 【JAVA习题二十九】809*??=8*??+9*??+1 其中??代表的两位数,8*??的结果为两位数，9*??的结果为3位数。求??代表的两位数，及809*??后的结果。
package erase; public class 八九与问好两位数的乘积和 { public static void main(String[] args) { int m,n;//m十位,n个 ...
- 【微信H5】 Redirect_uri参数错误解决方法
1 https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx14127af0bc9fd367&redirect_uri=http ...
- SQL--SQL详解（DDL，DML，DQL，DCL）
SQL--SQL详解(DDL,DML,DQL,DCL) 博客说明 文章所涉及的资料来自互联网整理和个人总结,意在于个人学习和经验汇总,如有什么地方侵权,请联系本人删除,谢谢! 什么是SQL? Stru ...
- Git Commit 提交规范
写好 Commit message 好处多多: 1.统一团队Git commit 日志风格 2.方便日后 Reviewing Code 3.帮助我们写好 Changelog 4.能很好的提升项目整体质 ...
- 跟着视频学python，Day1
python介绍 发展史 安装 Hello World程序 变量 用户输入 模块初识 数据类型初识 条件表达式if...elif...else 循环表达式while 循环表达式for python介绍 ...
- UI 自动化环境搭建
1,pip install selenium 2,驱动放在放在 Python 的根目录下