查询oracle比较慢的session和sql
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--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;
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)
SQL文本的前 1000个字符SQL_ID
VARCHAR2(13)
SQL identifier of the parent cursor in the library cacheSHARABLE_MEM
NUMBER
占用的共享内存大小 (单位: byte)PERSISTENT_MEM
NUMBER
生命期内的固定内存大小 (单位: byte)RUNTIME_MEM
NUMBER
执行期内的固定内存大小SORTS
NUMBER
完成的排序数VERSION_COUNT
NUMBER
Number of child cursors that are present in the cache under this parentLOADED_VERSIONS
NUMBER
显示上下文堆是否载入, 1是 0否OPEN_VERSIONS
NUMBER
显示子游标是否被锁, 1是 0否USERS_OPENING
NUMBER
执行语句的用户数FETCHES
NUMBER
SQL语句的 fetch数。EXECUTIONS
NUMBER
自它被载入缓存库后的执行次数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
执行语句的用户数LOADS
NUMBER
对象被载入过的次数FIRST_LOAD_TIME
VARCHAR2(19)
初次载入时间INVALIDATIONS
NUMBER
无效的次数PARSE_CALLS
NUMBER
解析调用次数DISK_READS
NUMBER
读磁盘次数DIRECT_WRITES
NUMBER
Sum of the number of direct writes over all child cursorsBUFFER_GETS
NUMBER
读缓存区次数APPLICATION_WAIT_TIME
NUMBER
Application wait timeCONCURRENCY_WAIT_TIME
NUMBER
Concurrency wait timeCLUSTER_WAIT_TIME
NUMBER
Cluster wait timeUSER_IO_WAIT_TIME
NUMBER
User I/O Wait TimePLSQL_EXEC_TIME
NUMBER
PL/SQL execution timeJAVA_EXEC_TIME
NUMBER
Java execution timeROWS_PROCESSED
NUMBER
解析 SQL语句返回的总列数COMMAND_TYPE
NUMBER
命令类型代号OPTIMIZER_MODE
VARCHAR2(25)
QL语句的优化器模型PARSING_USER_ID
NUMBER
第一个解析的用户 IDPARSING_SCHEMA_ID
NUMBER
第一个解析的计划 IDKEPT_VERSIONS
NUMBER
指出是否当前子游标被使用 DBMS_SHARED_POOL包标记为常驻内存ADDRESS
RAW(4 | 8)
当前游标父句柄地址HASH_VALUE
NUMBER
Hash value of the parent statement in the library cacheOLD_HASH_VALUE
NUMBER
Old SQL hash valueMODULE
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
columnACTION
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
columnSERIALIZABLE_ABORTS
NUMBER
Number of times the transaction fails to serialize, producing ORA-08177
errors, totalled over all the child cursorsCPU_TIME
NUMBER
CPU time (in microseconds) used by this cursor for parsing/executing/fetchingELAPSED_TIME
NUMBER
Elapsed time (in microseconds) used by this cursor for parsing/executing/fetchingIS_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 cursorPROGRAM_ID
NUMBER
Program identifie
来源:http://blog.csdn.net/sxhong/article/details/18262663
有很多种方法可以用来找出哪些SQL语句需要优化,但是很久以来,最简单的方法都是分析保存在V$SQL视图中的缓存的SQL信息。通过V$SQL视图,可以确定具有高消耗时间、CUP和IO读取的SQL语句。
1.查看总消耗时间最多的前10条SQL语句
select *
from (select v.sql_id,
v.child_number,
v.sql_text,
v.elapsed_time,
v.cpu_time,
v.disk_reads,
rank() over(order by v.elapsed_time desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;
2.查看CPU消耗时间最多的前10条SQL语句
select *
from (select v.sql_id,
v.child_number,
v.sql_text,
v.elapsed_time,
v.cpu_time,
v.disk_reads,
rank() over(order by v.cpu_time desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;
3.查看消耗磁盘读取最多的前10条SQL语句
select *
from (select v.sql_id,
v.child_number,
v.sql_text,
v.elapsed_time,
v.cpu_time,
v.disk_reads,
rank() over(order by v.disk_reads desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;
查询执行最慢的sql
select *
from (select sa.SQL_TEXT,
sa.SQL_FULLTEXT,
sa.EXECUTIONS "执行次数",
round(sa.ELAPSED_TIME / 1000000, 2) "总执行时间",
round(sa.ELAPSED_TIME / 1000000 / sa.EXECUTIONS, 2) "平均执行时间",
sa.COMMAND_TYPE,
sa.PARSING_USER_ID "用户ID",
u.username "用户名",
sa.HASH_VALUE
from v$sqlarea sa
left join all_users u
on sa.PARSING_USER_ID = u.user_id
where sa.EXECUTIONS > 0
order by (sa.ELAPSED_TIME / sa.EXECUTIONS) desc)
where rownum <= 50;
查询次数最多的 sql
select *
from (select s.SQL_TEXT,
s.EXECUTIONS "执行次数",
s.PARSING_USER_ID "用户名",
rank() over(order by EXECUTIONS desc) EXEC_RANK
from v$sql s
left join all_users u
on u.USER_ID = s.PARSING_USER_ID) t
where exec_rank <= 100;
- 查询oracle比较慢的session和sql
- 查询oracle比较慢的session和sql
- 查询oracle比较慢的session和sql
- 查询oracle比较慢的session和sql
- 查询oracle比较慢的session和sql
- 查询oracle比较慢的session和sql
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