知识大全 分析数据库性能的SQL
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分析数据库性能的SQL 以下文字资料是由(全榜网网www.cha138.com)小编为大家搜集整理后发布的内容,让我们赶快一起来看一下吧!
用于查看哪些实例的哪些操作使用了大量的临时段 SELECT to_number(decode(SID NULL SID)) sid operation_type OPERATION trunc(EXPECTED_SIZE/ ) ESIZE trunc(ACTUAL_MEM_USED/ ) MEM trunc(MAX_MEM_USED/ ) MAX MEM NUMBER_PASSES PASS trunc(TEMPSEG_SIZE/ ) TSIZE FROM V$SQL_WORKAREA_ACTIVE ORDER BY ; 查询有热块查询的SQL语句 select hash_value from v$sqltext a (select distinct a owner a segment_name a segment_type from dba_extents a (select dbarfil dbablk from (select dbarfil dbablk from x$bh order by tch desc) where rownum < ) b where a RELATIVE_FNO = b dbarfil and a BLOCK_ID <= b dbablk and a block_id + a blocks > b dbablk) b where a sql_text like % ||b segment_name|| % and b segment_type = TABLE order by a hash_value a address a piece; 全表扫描 select opname target b num_rows b tablespace_name count(target) from v$session_longops a all_all_tables b where a TARGET=b owner|| ||b table_name having count(target)> group by opname target b num_rows b tablespace_name 查看磁盘排序和缓存排序次数 select to_char(sn snap_time yyyy mm dd hh ) time_ avg(newmen value oldmen value) sorts_memeory avg(newdsk value olddsk value) disk_sort from stats$sysstat oldmen stats$sysstat newmen stats$sysstat newdsk stats$sysstat olddsk stats$snapshot sn where newdsk snap_id=sn snap_id and olddsk snap_id=sn snap_id and newmen snap_id=sn snap_id and newdsk snap_id=sn snap_id and oldmen name= sorts (memory) and newmen name= sorts (memory) and olddsk name= sorts (disk) and newdsk name= sorts (disk) group by to_char(sn snap_time yyyy mm dd hh ) 执行最慢的前 个SQL??? select * from ( select to_char(snap_time dd Mon HH :mi:ss ) mydate executions exec loads loads parse_calls parse disk_reads reads buffer_gets gets rows_processed rows_proc sorts sorts sql_text hash_value from perfstat stats$sql_summary sql perfstat stats$snapshot sn where sql snap_id > (select min(snap_id) min_snap from stats$snapshot where snap_time > sysdate $days_back) and sql snap_id = sn snap_id order by $sortskey desc) tt where rownum< ; SQL缓存池的命中率查询(pinhitratio gethitratio应该大于 %以上) select namespace gethitratio pinhitratio reloads invalidations from v$librarycache where namespace in ( SQL AREA TABLE/PROCEDURE BODY TRIGGER ) 数据库的常规参数我就不说了 除了V$parameter中的常规参数外 ORACLE还有大量的隐含参数 下面的语句就可以查询到数据库的所有隐含参数以及其值与参数的描述 SELECT NAME VALUE decode(isdefault TRUE Y N ) as Default decode(ISEM TRUE Y N ) as SesMod decode(ISYM IMMEDIATE I DEFERRED D FALSE N ) as SysMod decode(IMOD MODIFIED U SYS_MODIFIED S N ) as Modified decode(IADJ TRUE Y N ) as Adjusted description FROM ( GV$SYSTEM_PARAMETER SELECT x inst_id as instance x indx+ ksppinm as NAME ksppity ksppstvl as VALUE ksppstdf as isdefault decode(bitand(ksppiflg/ ) TRUE FALSE ) as ISEM decode(bitand(ksppiflg/ ) IMMEDIATE DEFERRED FALSE ) as ISYM decode(bitand(ksppstvf ) MODIFIED FALSE ) as IMOD decode(bitand(ksppstvf ) TRUE FALSE ) as IADJ ksppdesc as DESCRIPTION FROM x$ksppi x x$ksppsv y WHERE x indx = y indx AND substr(ksppinm ) = _ AND x inst_id = USERENV( Instance ) ) ORDER BY NAME 想知道现在哪个用户正在利用临时段吗?这个语句将告诉你哪个用户正在利用临时段 SELECT b tablespace b segfile# b segblk# b blocks a sid a serial# a username a osuser a status c sql_text FROM v$session a v$sort_usage b v$sql c WHERE a saddr = b session_addr AND a sql_address = c address(+) ORDER BY b tablespace b segfile# b segblk# b blocks; 查看磁盘碎片 select tablespace_name sqrt(max(blocks)/sum(blocks))* ( /sqrt(sqrt(count(blocks)))) FSFI from dba_free_space group by tablespace_name order by 查看表空间的名称及大小 select t tablespace_name round(sum(bytes/( * )) ) ts_size from dba_tablespaces t dba_data_files d where t tablespace_name = d tablespace_name group by t tablespace_name; 查看表空间物理文件的名称及大小 select tablespace_name file_id file_name round(bytes/( * ) ) total_space from dba_data_files order by tablespace_name; 查看回滚段名称及大小 select segment_name tablespace_name r status (initial_extent/ ) InitialExtent (next_extent/ ) NextExtent max_extents v curext CurExtent From dba_rollback_segs r v$rollstat v Where r segment_id = v usn(+) order by segment_name 耗资源的进程(top session) select s schemaname schema_name decode(sign( mand) to_char(mand) Action Code # || to_char(mand) ) action status session_status s osuser os_user_name s sid p spid s serial# serial_num nvl(s username [Oracle process] ) user_name s terminal terminal s program program st value criteria_value from v$sesstat st v$session s v$process p where st sid = s sid and st statistic# = to_number( ) and ( ALL = ALL or s status = ALL ) and p addr = s paddr order by st value desc p spid asc s username asc s osuser asc 查看锁(lock)情况 select /*+ RULE */ ls osuser os_user_name ls username user_name decode(ls type RW Row wait enqueue lock TM DML enqueue lock TX Transaction enqueue lock UL User supplied lock ) lock_type o object_name object decode(ls lmode null Row Share Row Exclusive Share Share Row Exclusive Exclusive null) lock_mode o owner ls sid ls serial# serial_num ls id ls id from sys dba_objects o ( select s osuser s username l type l lmode s sid s serial# l id l id from v$session s v$lock l where s sid = l sid ) ls where o object_id = ls id and o owner <> SYS order by o owner o object_name 查看低效率的SQL语句 SELECT EXECUTIONS DISK_READS BUFFER_GETS ROUND((BUFFER_GETS DISK_READS)/BUFFER_GETS ) Hit_radio ROUND(DISK_READS/EXECUTIONS ) Reads_per_run SQL_TEXT FROM V$SQLAREA WHERE EXECUTIONS> AND BUFFER_GETS > AND (BUFFER_GETS DISK_READS)/BUFFER_GETS < ORDER BY DESC cha138/Article/program/Oracle/201311/17408相关参考
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