oracle常用经典SQL查询

dn001 2010-03-05 15:29:57

　　14。回滚段查看

　　select rownum, sys.dba_rollback_segs.segment_name Name, v$rollstat.extents

　　Extents, v$rollstat.rssize Size_in_Bytes, v$rollstat.xacts XActs,

　　v$rollstat.gets Gets, v$rollstat.waits Waits, v$rollstat.writes Writes,

　　sys.dba_rollback_segs.status status from v$rollstat, sys.dba_rollback_segs,

　　v$rollname where v$rollname.name(+) = sys.dba_rollback_segs.segment_name and

　　v$rollstat.usn (+) = v$rollname.usn order by rownum

　　15。耗资源的进程（top session）

　　select s.schemaname schema_name,;decode(sign(48 - command), 1,

　　to_char(command), 'Action Code #' || to_char(command) ) 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 andst.statistic# = to_number('38') 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

　　16。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, 1, null, 2, 'Row Share', 3,

　　'Row Exclusive', 4, 'Share', 5, 'Share Row Exclusive', 6, 'Exclusive', null)

　　lock_mode,;o.owner,ls.sid,ls.serial# serial_num,ls.id1,ls.id2

　　from sys.dba_objects o, (select s.osuser,;s.username,;l.type,

　　l.lmode,;s.sid,;s.serial#,;l.id1,;l.id2from v$session s,

　　v$lock lwhere s.sid = l.sid ) ls; where o.object_id = ls.id1 and;o.owner

　　<> 'SYS'order by o.owner, o.object_name

　　17。查看等待（wait）情况

　　SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value

　　FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN ('db block gets',

　　'consistent gets') group by v$waitstat.class, v$waitstat.count

　　18。查看sga情况

　　SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC

　　19。查看catched object

　　SELECT owner,;;;name,;;;db_link,;;;namespace,

　　type,;;;sharable_mem,;;;loads,;;;executions,

　　locks,;;;pins,;;;kept;;;;;FROM v$db_object_cache
　　20。查看V$SQLAREA

　　SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,

　　VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,

　　USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS, DISK_READS,

　　BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA

　　21。查看object分类数量

　　select decode (o.type#,1,'INDEX' , 2,'TABLE' , 3 , 'CLUSTER' , 4, 'VIEW' , 5 ,

　　'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) object_type , count(*) quantity from

　　sys.obj$ o where o.type# > 1 group by decode (o.type#,1,'INDEX' , 2,'TABLE' , 3

　　, 'CLUSTER' , 4, 'VIEW' , 5 , 'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) union select

　　'COLUMN' , count(*) from sys.col$ union select 'DB LINK' , count(*) from

　　22。按用户查看object种类

　　select u.name schema,sum(decode(o.type#, 1, 1, NULL)) indexes,

　　sum(decode(o.type#, 2, 1, NULL)) tables,sum(decode(o.type#, 3, 1, NULL))

　　clusters,sum(decode(o.type#, 4, 1, NULL)) views,sum(decode(o.type#, 5, 1,

　　NULL)) synonyms,sum(decode(o.type#, 6, 1, NULL)) sequences,

　　sum(decode(o.type#, 1, NULL, 2, NULL, 3, NULL, 4, NULL, 5, NULL, 6, NULL, 1))

　　othersfrom sys.obj$ o, sys.user$ uwhere o.type# >= 1 and;u.user# =

　　o.owner# andu.name <> 'PUBLIC'group by u.name;order by

　　sys.link$ union select 'CONSTRAINT' , count(*) from sys.con$

　　23。有关connection的相关信息

　　1）查看有哪些用户连接

　　select s.osuser os_user_name,;decode(sign(48 - command), 1, to_char(command),

　　'Action Code #' || to_char(command) ) action,;;p.program oracle_process,

　　status session_status,;s.terminal terminal,;s.program program,

　　s.username user_name,;s.fixed_table_sequence activity_meter,;'' query,

　　0 memory,;0 max_memory,;;0 cpu_usage,;s.sid,s.serial# serial_num

　　from v$session s,;v$process pwhere s.paddr=p.addr and;s.type = 'USER'

　　order by s.username, s.osuser

　　2）根据v.sid查看对应连接的资源占用等情况

　　select n.name,

　　v.value,

　　n.class,

　　n.statistic#

　　from; v$statname n,

　　v$sesstat v

　　where v.sid = 71 and

　　v.statistic# = n.statistic#

　　order by n.class, n.statistic#

　　3）根据sid查看对应连接正在运行的sql

　　select /*+ PUSH_SUBQ */

　　command_type,

　　sql_text,

　　sharable_mem,

　　persistent_mem,

　　runtime_mem,

　　sorts,

　　version_count,

　　loaded_versions,

　　open_versions,

　　users_opening,

　　executions,

　　users_executing,

　　loads,

　　first_load_time,

　　invalidations,

　　parse_calls,

　　disk_reads,

　　buffer_gets,

　　rows_processed,

　　sysdate start_time,

　　sysdate finish_time,

　　'>' || address sql_address,

　　'N' status

　　from v$sqlarea

　　where address = (select sql_address from v$session where sid = 71)
　　24．查询表空间使用情况

　　select a.tablespace_name "表空间名称",

　　100-round((nvl(b.bytes_free,0)/a.bytes_alloc)*100,2) "占用率(%)",

　　round(a.bytes_alloc/1024/1024,2) "容量(M)",

　　round(nvl(b.bytes_free,0)/1024/1024,2) "空闲(M)",

　　round((a.bytes_alloc-nvl(b.bytes_free,0))/1024/1024,2) "使用(M)",

　　Largest "最大扩展段(M)",

　　to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') "采样时间"

　　from; (select f.tablespace_name,

　　sum(f.bytes) bytes_alloc,

　　sum(decode(f.autoextensible,'YES',f.maxbytes,'NO',f.bytes)) maxbytes

　　from dba_data_files f

　　group by tablespace_name) a,

　　(select; f.tablespace_name,

　　sum(f.bytes) bytes_free

　　from dba_free_space f

　　group by tablespace_name) b,

　　(select round(max(ff.length)*16/1024,2) Largest,

　　ts.name tablespace_name

　　from sys.fet$ ff, sys.file$ tf,sys.ts$ ts

　　where ts.ts#=ff.ts# and ff.file#=tf.relfile# and ts.ts#=tf.ts#

　　group by ts.name, tf.blocks) c

　　where a.tablespace_name = b.tablespace_name and a.tablespace_name = c.tablespace_name