oracle-查询执行速度慢的sql
分类: Oracle
2:INSERT3:SELECT6:UPDATE7:DELETE189:MERGE
--查询最慢的sql
select * from (
select parsing_user_id,executions,sorts
command_type,disk_reads,sql_text from v$sqlarea order by disk_reads desc
)where rownum<10
--查询对应session
select SE.SID,SE.SERIAL#,PR.SPID,
SE.USERNAME,SE.STATUS,SE.TERMINAL,
SE.PROGRAM,SE.MODULE,
SE.SQL_ADDRESS,ST.EVENT,
ST.P1TEXT,SI.PHYSICAL_READS,SI.BLOCK_CHANGES from v$session se,v$session_wait st,
v$sess_io si,v$process pr
where st.SID=se.SID and st.SID=si.SID
AND SE.PADDR=PR.ADDR
AND SE.SID>6
AND ST.WAIT_TIME=0
AND ST.EVENT NOT LIKE '%SQL%'
ORDER BY PHYSICAL_READS DESC;
SELECT sql_address FROM V$SESSION SS,V$SQLTEXT TT
WHERE SS.SQL_HASH_VALUE=TT.HASH_VALUE AND SID=439;
v$sqltext:存储的是完整的SQL,SQL被分割
v$sqlarea:存储的SQL 和一些相关的信息,比如累计的执行次数,逻辑读,物理读等统计信息(统计)
v$sql:内存共享SQL区域中已经解析的SQL语句。(即时)
根据sid查找完整sql语句:
select sql_text from v$sqltext a where a.hash_value = (select sql_hash_value from v$session b where b.sid = '&sid' )
order by piece asc
select a.CPU_TIME,--CPU时间 百万分之一(微秒)
a.OPTIMIZER_MODE,--优化方式
a.EXECUTIONS,--执行次数
a.DISK_READS,--读盘次数
a.SHARABLE_MEM,--占用shared pool的内存多少
a.BUFFER_GETS,--读取缓冲区的次数
a.COMMAND_TYPE,--命令类型(3:select,2:insert;6:update;7delete;47:pl/sql程序单元)
a.SQL_TEXT,--Sql语句
a.SHARABLE_MEM,
a.PERSISTENT_MEM,
a.RUNTIME_MEM,
a.PARSE_CALLS,
a.DISK_READS,
a.DIRECT_WRITES,
a.CONCURRENCY_WAIT_TIME,
a.USER_IO_WAIT_TIME
from SYS.V_$SQLAREA a
WHERE PARSING_SCHEMA_NAME = 'CHEA_FILL'--表空间
order by a.CPU_TIME desc
引用:http://jenniferok.iteye.com/blog/700985
a.executions exec,a.disk_reads/decode(a.executions,0,1,a.executions) rds_exec_ratio,
a.sql_text Statement
from v$sqlarea a,dba_users b
where a.parsing_user_id=b.user_id
and a.disk_reads > 100000
order by a.disk_reads desc;
from (select sql_text,executions,
rank() over
(order by executions desc) exec_rank
from v$sql)
where exec_rank <=5;
select disk_reads,sql_text
from (select sql_text,disk_reads,
dense_rank() over
(order by disk_reads desc) disk_reads_rank
from v$sql)
where disk_reads_rank <=5;
from (select sql_text,buffer_gets,
dense_rank() over
(order by buffer_gets desc) buffer_gets_rank
from v$sql)
where buffer_gets_rank<=5;
SQL_TEXT |
VARCHAR2(1000) |
First thousand characters of the SQL text for the current cursor |
SQL_ID |
VARCHAR2(13) |
SQL identifier of the parent cursor in the library cache |
SHARABLE_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 cursors |
VERSION_COUNT |
NUMBER |
Number of child cursors that are present in the cache under this parent |
LOADED_VERSIONS |
NUMBER |
Number of child cursors that are present in the cache and have their context heap (KGL heap 6) loaded |
OPEN_VERSIONS |
NUMBER |
The number of child cursors that are currently open under this current parent |
USERS_OPENING |
NUMBER |
Number of users that have any of the child cursors open |
FETCHES |
NUMBER |
Number of fetches associated with the SQL statement |
EXECUTIONS |
NUMBER |
Total number of executions, totalled over all the child cursors |
END_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 cursors |
LOADS |
NUMBER |
Number of times the object was loaded or reloaded |
FIRST_LOAD_TIME |
VARCHAR2(19) |
Timestamp of the parent creation time |
INVALIDATIONS |
NUMBER |
Total number of invalidations over all the child cursors |
PARSE_CALLS |
NUMBER |
Sum of all parse calls to all the child cursors under this parent |
DISK_READS |
NUMBER |
Sum of the number of disk reads over all child cursors |
DIRECT_WRITES |
NUMBER |
Sum of the number of direct writes over all child cursors |
BUFFER_GETS |
NUMBER |
Sum of buffer gets over all child cursors |
APPLICATION_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 statement |
COMMAND_TYPE |
NUMBER |
Oracle command type definition |
OPTIMIZER_MODE |
VARCHAR2(25) |
Mode under which the SQL statement was executed |
PARSING_USER_ID |
NUMBER |
User ID of the user that has parsed the very first cursor under this parent |
PARSING_SCHEMA_ID |
NUMBER |
Schema ID that was used to parse this child cursor |
KEPT_VERSIONS |
NUMBER |
Number of child cursors that have been marked to be kept using the DBMS_SHARED_POOL package |
ADDRESS |
RAW(4 | 8) |
Address of the handle to the parent for this cursor |
HASH_VALUE |
NUMBER |
Hash value of the parent statement in the library cache |
OLD_HASH_VALUE |
NUMBER |
Old SQL hash value |
MODULE |
VARCHAR2(64) |
Contains the name of the module that was executing at the time that the SQL statement was first parsed as set by calling DBMS_APPLICATION_INFO .SET_MODULE |
MODULE_HASH |
NUMBER |
Hash value of the module that is named in the MODULE column |
ACTION |
VARCHAR2(64) |
Contains the name of the action that was executing at the time that the SQL statement was first parsed as set by calling DBMS_APPLICATION_INFO .SET_ACTION |
ACTION_HASH |
NUMBER |
Hash value of the action that is named in the ACTION column |
SERIALIZABLE_ABORTS |
NUMBER |
Number of times the transaction fails to serialize, producing ORA-08177 errors, totalled over all the child cursors |
CPU_TIME |
NUMBER |
CPU time (in microseconds) used by this cursor for parsing/executing/fetching |
ELAPSED_TIME |
NUMBER |
Elapsed time (in microseconds) used by this cursor for parsing/executing/fetching |
IS_OBSOLETE |
VARCHAR2(1) |
Indicates whether the cursor has become obsolete (Y ) or not (N ). This can happen if the number of child cursors is too large. |
CHILD_LATCH |
NUMBER |
Child latch number that is protecting the cursor |
PROGRAM_ID |
NUMBER |
Program identifie |
oracle-查询执行速度慢的sql的更多相关文章
- oracle -- 查询执行计划,判读查询语句优劣
以oracle的scott账户:找到员工表中薪水大于本部门平均薪水的员工为例 多表查询方式: select e.empno, e.ename, e.sal, d.avgsal from emp e, ...
- oracle 查询执行过的SQL语句
SELECT * FROM v$sqlarea t WHERE t.FIRST_LOAD_TIME between '2016-12-23/16:03:00' and '2016-12-23/16:0 ...
- oracle查看执行最慢与查询次数最多的sql语句及其执行速度很慢的问题分析
oracle查看执行最慢与查询次数最多的sql语句 注:本文来源 于<oracle查看执行最慢与查询次数最多的sql语句> 前言 在ORACLE数据库应用调优中,一个SQL的执行次数/频率 ...
- oracle查看执行最慢与查询次数最多的sql语句
前言 在ORACLE数据库应用调优中,一个SQL的执行次数/频率也是常常需要关注的,因为某个SQL执行太频繁,要么是由于应用设计有缺陷,需要在业务逻辑上做出优化处理,要么是业务特殊性所导致.如果执行频 ...
- 【Oracle】查询执行慢的sql
查询执行最慢的sql select * from (select sa.SQL_TEXT, sa.SQL_FULLTEXT, sa.EXECUTIONS "执行次数", round ...
- oracle 查看执行最慢 sql
查询执行最慢的sql select * from (select sa.SQL_TEXT, sa.SQL_FULLTEXT, sa.EXECUTIONS "执行次数", round ...
- ORACLE 查询不走索引的原因分析,解决办法通过强制索引或动态执行SQL语句提高查询速度
(一)索引失效的原因分析: <>或者单独的>,<,(有时会用到,有时不会) 有时间范围查询:oracle 时间条件值范围越大就不走索引 like "%_" ...
- 【ORACLE】记录通过执行Oracle的执行计划查询SQL脚本中的效率问题
记录通过执行Oracle的执行计划查询SQL脚本中的效率问题 问题现象: STARiBOSS5.8.1R2版本中,河北对帐JOB执行时,无法生成发票对帐文件. 首先,Quartz表达式培植的启 ...
- oracle 查询最近执行过的 SQL语句(转载)
oracle 查询最近执行过的 SQL语句 (2014-06-09 18:02:43) 转载▼ 分类: Database oracle 查询最近执行过的 SQL语句 select sql_text ...
随机推荐
- C# Monads的实现(二)
再谈continuation monad 上一篇中我们已经介绍了continuation monad,但是这个monad与Identity,Maybe,IEnumerable monads稍微难于理解 ...
- uint8与double,二维矩阵显示灰度图
double型0~1对应uint8型0~255,转换用im2double和im2uint8 如果直接用uint8(double型),则为0~1的uint8型数据,图像全黑. 处理数据过程推荐用doub ...
- Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
在mac上面安装mysql之后,输入mysql一直报错,可以通过下面的方法解决. mysqld stop mysql.server start http://stackoverflow.com/q ...
- 核心梳理——消息处理的骨架流程——ESFramework 4.0 进阶(02)
在ESFramework 4.0 概述一文中,我们提到ESFramework.dll作为通信框架的核心,定义了消息处理的骨架流程,本文我们来详细剖析这个流程以及该骨架中所涉及的各个组件.ESFrame ...
- js 中null 和 undifined
1.一个重要问题 null == undifined (true) ; null === undefined (false) 为什么是这样的呢? undifined是未赋值的基本数据类型,未定义: n ...
- elipse图标注解
Java中的访问修饰符(访问控制符)包括:public,protected,default,private.分别代表了不同的访问权限.如果省略,则被视为使用了默认的default作为访问修饰符.从字面 ...
- HDU - 2586 How far away ?(LCA模板题)
HDU - 2586 How far away ? Time Limit: 1000MS Memory Limit: 32768KB 64bit IO Format: %I64d & ...
- CodeForces 698B Fix a Tree (并查集应用)
当时也是想到了并查集,但是有几个地方没有想清楚,所以就不知道怎么写了,比如说如何确定最优的问题.赛后看了一下别人的思路,才知道自己确实经验不足,思维也没跟上. 其实没有那么复杂,这个题目我们的操作只有 ...
- Android闪光灯操作
flashMode=Camera.Parameters.FLASH_MODE_TORCH;----常亮效果 Camera.Parameters.FLASH_MODE_ON----一闪一闪的效果
- POJ 1966 ZOJ 2182 Cable TV Network
无向图顶点连通度的求解,即最少删除多少个点使无向图不连通. 我校“荣誉”出品的<图论算法理论.实现及其应用>这本书上写的有错误,请不要看了,正确的是这样的: 对于每个顶点,分成两个点,v和 ...