查询oracle比较慢的session和sql
注:本文来源:sxhong 《查询oracle比较慢的session和sql》
1 ---查询最慢的sql
2
3 select * from (
4 select parsing_user_id,executions,sorts
5 command_type,disk_reads,sql_text from v$sqlarea order by disk_reads desc
6 )where rownum<10
7
8 ---查询对应session
9
10 select SE.SID,SE.SERIAL#,PR.SPID,
11 SE.USERNAME,SE.STATUS,SE.TERMINAL,
12 SE.PROGRAM,SE.MODULE,
13 SE.SQL_ADDRESS,ST.EVENT,
14 ST.P1TEXT,SI.PHYSICAL_READS,SI.BLOCK_CHANGES from v$session se,v$session_wait st,
15 v$sess_io si,v$process pr
16 where st.SID=se.SID and st.SID=si.SID
17 AND SE.PADDR=PR.ADDR
18 AND SE.SID>6
19 AND ST.WAIT_TIME=0
20 AND ST.EVENT NOT LIKE '%SQL%'
21 ORDER BY PHYSICAL_READS DESC;
22 SELECT sql_address FROM V$SESSION SS,V$SQLTEXT TT
23 WHERE SS.SQL_HASH_VALUE=TT.HASH_VALUE AND SID=439;
24
25
26 --v$sqltext:存储的是完整的SQL,SQL被分割
27
28 --v$sqlarea:存储的SQL 和一些相关的信息,比如累计的执行次数,逻辑读,物理读等统计信息(统计)
29
30 --v$sql:内存共享SQL区域中已经解析的SQL语句。(即时)
31
32
33
34 --根据sid查找完整sql语句:
35
36 select sql_text from v$sqltext a where a.hash_value = (select sql_hash_value from v$session b where b.sid = '&sid' )
37 order by piece asc
38
39
40
41 select a.CPU_TIME,--CPU时间 百万分之一(微秒)
42 a.OPTIMIZER_MODE,--优化方式
43 a.EXECUTIONS,--执行次数
44 a.DISK_READS,--读盘次数
45 a.SHARABLE_MEM,--占用shared pool的内存多少
46 a.BUFFER_GETS,--读取缓冲区的次数
47 a.COMMAND_TYPE,--命令类型(3:select,2:insert;6:update;7delete;47:pl/sql程序单元)
48 a.SQL_TEXT,--Sql语句
49 a.SHARABLE_MEM,
50 a.PERSISTENT_MEM,
51 a.RUNTIME_MEM,
52 a.PARSE_CALLS,
53 a.DISK_READS,
54 a.DIRECT_WRITES,
55 a.CONCURRENCY_WAIT_TIME,
56 a.USER_IO_WAIT_TIME
57 from SYS.V_$SQLAREA a
58 WHERE PARSING_SCHEMA_NAME = 'CHEA_FILL'--表空间
59 order by a.CPU_TIME desc
60
61
62
63
64
65 ---从V$SQLAREA中查询最占用资源的查询
66 select b.username username,a.disk_reads reads,
67 a.executions exec,a.disk_reads/decode(a.executions,0,1,a.executions) rds_exec_ratio,
68 a.sql_text Statement
69 from v$sqlarea a,dba_users b
70 where a.parsing_user_id=b.user_id
71 and a.disk_reads > 100000
72 order by a.disk_reads desc;
73 --用buffer_gets列来替换disk_reads列可以得到占用最多内存的sql语句的相关信息。
74
75 --v$sql:内存共享SQL区域中已经解析的SQL语句。(即时)
76
77 --列出使用频率最高的5个查询:
78 select sql_text,executions
79 from (select sql_text,executions,
80 rank() over
81 (order by executions desc) exec_rank
82 from v$sql)
83 where exec_rank <=5;
84 --消耗磁盘读取最多的sql top5:
85 select disk_reads,sql_text
86 from (select sql_text,disk_reads,
87 dense_rank() over
88 (order by disk_reads desc) disk_reads_rank
89 from v$sql)
90 where disk_reads_rank <=5;
91
92 --找出需要大量缓冲读取(逻辑读)操作的查询:
93 select buffer_gets,sql_text
94 from (select sql_text,buffer_gets,
95 dense_rank() over
96 (order by buffer_gets desc) buffer_gets_rank
97 from v$sql)
98 where buffer_gets_rank<=5;
99
100 v$sqlarea字段定义:http://happyhou.blog.sohu.com/60494432.html
SQL_TEXT VARCHAR2(1000) First thousand characters of the SQL text for the
current cursorSQL_ID VARCHAR2(13) SQL identifier of the parent cursor in the library
cacheSHARABLE_MEM NUMBER Amount of shared memory used by a cursor. If multiple
child cursors exist, then the sum of all shared memory used by all child
cursors.PERSISTENT_MEM NUMBER Fixed amount of memory used for the lifetime of an
open cursor. If multiple child cursors exist, the fixed sum of memory used for
the lifetime of all the child cursors.RUNTIME_MEM NUMBER Fixed amount of memory required during execution of a
cursor. If multiple child cursors exist, the fixed sum of all memory required
during execution of all the child cursors.SORTS NUMBER Sum of the number of sorts that were done for all the
child cursorsVERSION_COUNT NUMBER Number of child cursors that are present in the cache
under this parentLOADED_VERSIONS NUMBER Number of child cursors that are present in the cache
and have their context heap (KGL heap 6) loadedOPEN_VERSIONS NUMBER The number of child cursors that are currently open
under this current parentUSERS_OPENING NUMBER Number of users that have any of the child cursors
openFETCHES NUMBER Number of fetches associated with the SQL
statementEXECUTIONS NUMBER Total number of executions, totalled over all the
child cursorsEND_OF_FETCH_COUNT NUMBER Number of times this cursor was fully executed since
the cursor was brought into the library cache. The value of this statistic is
not incremented when the cursor is partially executed, either because it failed
during the execution or because only the first few rows produced by this cursor
are fetched before the cursor is closed or re-executed. By definition, the
value of theEND_OF_FETCH_COUNT column should be less or
equal to the value of the EXECUTIONS column.USERS_EXECUTING NUMBER Total number of users executing the statement over all
child cursorsLOADS NUMBER Number of times the object was loaded or
reloadedFIRST_LOAD_TIME VARCHAR2(19) Timestamp of the parent creation time INVALIDATIONS NUMBER Total number of invalidations over all the child
cursorsPARSE_CALLS NUMBER Sum of all parse calls to all the child cursors under
this parentDISK_READS NUMBER Sum of the number of disk reads over all child
cursorsDIRECT_WRITES NUMBER Sum of the number of direct writes over all child
cursorsBUFFER_GETS NUMBER Sum of buffer gets over all child
cursorsAPPLICATION_WAIT_TIME NUMBER Application wait time CONCURRENCY_WAIT_TIME NUMBER Concurrency wait time CLUSTER_WAIT_TIME NUMBER Cluster wait time USER_IO_WAIT_TIME NUMBER User I/O Wait Time PLSQL_EXEC_TIME NUMBER PL/SQL execution time JAVA_EXEC_TIME NUMBER Java execution time ROWS_PROCESSED NUMBER Total number of rows processed on behalf of this SQL
statementCOMMAND_TYPE NUMBER Oracle command type definition OPTIMIZER_MODE VARCHAR2(25) Mode under which the SQL statement was
executedPARSING_USER_ID NUMBER User ID of the user that has parsed the very first
cursor under this parent
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