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$sqlarea a,dba_users b
where a.parsing_user_id=b.user_id
and a.disk_reads > 100000
order by a.disk_reads desc;
列出使用频率最高的5个查询:
from (select sql_text,executions,
rank() over
(order by executions desc) exec_rank
from v$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$sql)
where disk_reads_rank <=5;
找出需要大量缓冲读取(逻辑读)操作的查询:
from (select sql_text,buffer_gets,
dense_rank() over
(order by buffer_gets desc) buffer_gets_rank
from v$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 the END_OF_FETCH_COUNT column should be less or equal to the value of theEXECUTIONS 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 theDBMS_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
|
相关推荐
Oracle中SQL语句执行效率的查找与解决..
Oracle的SQL语句执行效率问题查找与解决方法文.pdf
主要给大家介绍了oracle查看执行最慢与查询次数最多的sql语句,文中给出完整的示例代码,相信对大家的学习或者工作具有一定的参考价值,有需要的朋友们下面来一起看看吧。
执行路径:ORACLE的这个功能大大地提高了SQL的执行性能并节省了内存的使用:我们发现,单...当你向ORACLE提交一个SQL语句,ORACLE会首先在这块内存中查找相同的语句. 这里需要注明的是,ORACLE对两者采取的是一种严格匹配,要
如 修改、插入行、删除行、提 交(将表格中的数据改变写入相应的数据库表中)、多功能拷贝、将选择的单元格数据导出为 XLS /CSV /INSERT SQL /HTML /XML 等格式、单条记录操作、能方便地查找\替换单元格中的数据、...
多线程、多连接、智能/彩色SQL编辑器、中英文双语界面并能切换、支持 PL/SQL、批量SQL运行、高效的块操作、方便的表格操作,不需要安装 Oracle 客户端,能运行于所有的主流平台包括 Windows、Linux 、Unix 及 Mac ...
Oracle的SQL语句执行效率问题查找与解决方法。
10.2.5 将子查询因子化应用到PL/SQL中 270 10.3 递归子查询 273 10.3.1 一个CONNECT BY的例子 274 10.3.2 使用RSF的例子 275 10.3.3 RSF的限制条件 276 10.3.4 与CONNECT BY的不同点 276 10.4 复制CONNECT BY...
Oracle SQL Handler,是专为 Oracle 数据库开发人员及操作人员精心打造的一款 Oracle 客户端工具: 超智能的SQL编辑器;超方便的表格操作(可以通过修改表格的单元格数据去更新数据 库表);多种格式的数据导出包括...
当你向ORACLE 提交一个SQL语句,ORACLE会首先在这块内存中查找相同的语句. 这里需要注明的是,ORACLE对两者采取的是一种严格匹配,要达成共享,SQL语句必须 完全相同(包括空格,换行等). 共享的语句必须满足三个...
包括:数据库设计方法.doc,Database Design.ppt,Oracle的SQL语句执行效率问题查找与解决方法.doc,Oracle数据库设计要做到五戒.txt,oracle性能优化总结.doc,SQL语句全优化.doc,数据库设计中的14个实用技巧.doc,优化...
Oracle数据库内部培训资料,oracle专业优化文档,Oracle的SQL语句执行效率问题查找与解决方法文档,oracle性能优化总结文档,数据库设计方法文档,SQL语句全优化文档,数据库设计中的14个实用技巧文档,优化Oracle库表...
Oracle语句优化53个... 当你向ORACLE 提交一个SQL语句,ORACLE会首先在这块内存中查找相同的语句。 这里需要注明的是,ORACLE对两者采取的是一种严格匹配,要达成共享,SQL语句必须完全相同(包括空格,换行等)。
ORACLE用户是学习ORACLE数据库中的基础知识,下面就介绍下类系统常用的默认ORACLE用户: 1. sys用户:超级用户,完全是个SYSDBA(管理数据库的人)。拥有dba,sysdba,sysoper等角色或权限。是oracle权限最高的用户,...
包含Oracle的SQL语句执行效率问题查找与解决方法文档,oracle性能优化总结文档,数据库设计方法文档,SQL语句全优化文档,数据库设计中的14个实用技巧文档,优化Oracle库表设计的若干方法等...对于想系统研究数据库和...
另外,在显示结果的同时,SQL的执行计划和统计信息也被显示出来,这样您可以一边看着Oracle的内部优化算法,一边做出高效率的程序来. Object Browser也支持托拽机能.对已经保存好的...
存储过程是一组为了完成特定功能的SQL语句集,经编译后存储在数据库中。用户通过指定存储过程的名字并给出参数(如果该存储过程带有参数)来执行它。 1.9.2 准备 create table t_user ( username varchar2(20), ...