知识大全数据库管理员日常工作中必备的sql列表[1]

Posted 2022-07-16 数据库

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　　数据库管理员日常工作中必备的sql列表

　　监控索引是否使用

　　alter index &index_name monitoring usage;　　alter index &index_name nomonitoring usage;　　select * from v$object_usage where index_name = &index_name;

　　求数据文件的I/O分布

　　select df name phyrds phywrts phyblkrd phyblkwrt singleblkrds readtim writetim　　from v$filestat fs v$dbfile df　　where fs file#=df file# order by df name;

　　求某个隐藏参数的值

　　col ksppinm format a 　　col ksppstvl format a 　　select ksppinm ksppstvl　　from x$ksppi pi x$ksppcv cv　　where cv indx=pi indx and pi ksppinm like \\_% escape \\ and pi ksppinm like %meer% ;

　　求系统中较大的latch

　　select name sum(gets) sum(misses) sum(sleeps) sum(wait_time)　　from v$latch_children　　group by name having sum(gets) > order by ;

　　求归档日志的切换频率(生产系统可能时间会很长)

　　select start_recid start_time end_recid end_time minutes from (select test * rownum as rn　　from (select b recid start_recid to_char(b first_time yyyy mm dd hh :mi:ss ) start_time 　　a recid end_recid to_char(a first_time yyyy mm dd hh :mi:ss ) end_time round(((a first_time b first_time)* )* ) minutes　　from v$log_history a v$log_history b where a recid=b recid+ and b first_time > sysdate 　　order by a first_time desc) test) y where y rn <

　　求回滚段正在处理的事务

　　select a name b xacts c sid c serial# d sql_text　　from v$rollname a v$rollstat b v$session c v$sqltext d v$transaction e　　where a usn=b usn and b usn=e xidusn and c taddr=e addr　　and c sql_address=d address and c sql_hash_value=d hash_value order by a name c sid d piece;

　　求出无效的对象

　　select alter procedure ||object_name|| pile; 　　from dba_objects　　where status= INVALID and wner= & and object_type in ( PACKAGE PACKAGE BODY );　　/　　select owner object_name object_type status from dba_objects where status= INVALID ;

　　求process/session的状态

　　select p pid p spid s program s sid s serial#　　from v$process p v$session s where s paddr=p addr;

　　求当前session的状态

　　select sn name ms value　　from v$mystat ms v$statname sn　　where ms statistic#=sn statistic# and ms value > ;

　　求表的索引信息

　　select ui table_name ui index_name　　from user_indexes ui user_ind_columns uic　　where ui table_name=uic table_name and ui index_name=uic index_name　　and ui table_name like &table_name% and uic column_name= &column_name ;

　　显示表的外键信息

　　col search_condition format a 　　select table_name constraint_name　　from user_constraints　　where constraint_type = R and constraint_name in (select constraint_name from user_cons_columns where column_name= & );　　select rpad(child table_name ) child_tablename 　　rpad(cp column_name ) referring_column rpad(parent table_name ) parent_tablename 　　rpad(pc column_name ) referred_column rpad(child constraint_name ) constraint_name　　from user_constraints child user_constraints parent 　　user_cons_columns cp user_cons_columns pc　　where child constraint_type = R and child r_constraint_name = parent constraint_name and　　child constraint_name = cp constraint_name and parent constraint_name = pc constraint_name and　　cp position = pc position and child table_name = &table_name 　　order by child owner child table_name child constraint_name cp position;

　　显示表的分区及子分区(user_tab_subpartitions)

　　col table_name format a 　　col partition_name format a 　　col high_value format a 　　select table_name partition_name HIGH_VALUE from user_tab_partitions where table_name= &table_name

　　使用dbms_xplan生成一个执行计划

　　explain plan set statement_id = &sql_id for &sql;　　select * from table(dbms_xplan display);

　　求某个事务的重做信息(bytes)

　　select s name m value　　from v$mystat m v$statname s　　where m statistic#=s statistic# and s name like %redo size% ;

　　求cache中缓存超过其 %的对象

　　select o owner o object_type o object_name count(b objd)　　from v$bh b dba_objects o　　where b objd = o object_id　　group by o owner o object_type o object_name　　having count(b objd) > (select to_number(value)* from v$parameter where name = db_block_buffers );

　　求谁阻塞了某个session( g)

　　select sid username event blocking_session 　　seconds_in_wait wait_time　　from v$session where state in ( WAITING ) and wait_class != Idle ;

　　求session的OS进程ID

　　col program format a 　　select p spid OS Thread b name Name User s program　　from v$process p v$session s v$bgprocess b　　where p addr = s paddr and p addr = b paddr　　UNION ALL　　select p spid OS Thread s username Name User s program　　from v$process p v$session s where p addr = s paddr and s username is not null;

　　查会话的阻塞

　　col user_name format a 　　select /*+ rule */ lpad( decode(l xidusn ))||l oracle_username user_name o owner o object_name s sid s serial#　　from v$locked_object l dba_objects o v$session s　　where l object_id=o object_id and l session_id=s sid order by o object_id xidusn desc ;　　col username format a 　　col lock_level format a 　　col owner format a 　　col object_name format a 　　select /*+ rule */ s username decode(l type tm table lock tx row lock null) lock_level o owner o object_name s sid s serial#　　from v$session s v$lock l dba_objects o　　where l sid = s sid and l id = o object_id(+) and s username is not null ;

　　求等待的事件及会话信息/求会话的等待及会话信息

　　select se sid s username se event se total_waits se time_waited se average_wait　　from v$session s v$session_event se　　where s username is not null and se sid=s sid and s status= ACTIVE and se event not like %SQL*Net% order by s username;　　select s sid s username sw event sw wait_time sw state sw seconds_in_wait　　from v$session s v$session_wait sw　　where s username is not null and sw sid=s sid and sw event not like %SQL*Net% order by s username;

cha138/Article/program/SQL/201311/16149

知识大全 数据库管理员日常工作中必备的sql列表[1]

知识大全数据库管理员日常工作中必备的sql列表[1]