Oracle维护常用SQL语句查询系统表和视图.docx

1、Oracle维护常用SQL语句查询系统表和视图Oracle维护常用SQL语句（查询系统表和视图）提要：1、查看表空间的名称及大小2、查看表空间物理文件的名称及大小3、查看回滚段名称及大小4、查看控制文件5、查看日志文件6、查看表空间的使用情况7、查看数据库库对象8、查看数据库的版本9、查看数据库的创建日期和归档方式10、捕捉运行很久的SQL11。查看数据表的参数信息12.查看还没提交的事务13。查找object为哪些进程所用14。回滚段查看15。耗资源的进程（top session）16。查看锁（lock）情况17。查看等待（wait）情况18。查看sga情况19。查看catched obje

2、ct20。查看V$SQLAREA21。查看object分类数量22。按用户查看object种类23。有关connection的相关信息1）查看有哪些用户连接2）根据v.sid查看对应连接的资源占用等情况3）根据sid查看对应连接正在运行的sql24查询表空间使用情况25.查询表空间的碎片程度 26.查询正在运行的数据库实例1、查看表空间的名称及大小select t.tablespace_name, round(sum(bytes/(1024*1024),0) ts_sizefrom dba_tablespaces t, dba_data_files dwhere t.tablespace_na

3、me = d.tablespace_namegroup by t.tablespace_name;2、查看表空间物理文件的名称及大小select tablespace_name, file_id, file_name,round(bytes/(1024*1024),0) total_spacefrom dba_data_filesorder by tablespace_name;3、查看回滚段名称及大小select segment_name, tablespace_name, r.status, (initial_extent/1024) InitialExtent,(next_extent/

4、1024) NextExtent, max_extents, v.curext CurExtentFrom dba_rollback_segs r, v$rollstat vWhere r.segment_id = v.usn(+)order by segment_name ;4、查看控制文件select name from v$controlfile;5、查看日志文件select member from v$logfile;6、查看表空间的使用情况select sum(bytes)/(1024*1024) as free_space,tablespace_name from dba_free

5、_spacegroup by tablespace_name;SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,(B.BYTES*100)/A.BYTES % USED,(C.BYTES*100)/A.BYTES % FREEFROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE CWHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME; 7、查看数据库

6、库对象select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;8、查看数据库的版本Select version FROM Product_component_version Where SUBSTR(PRODUCT,1,6)=Oracle;9、查看数据库的创建日期和归档方式Select Created, Log_Mode, Log_Mode From V$Database; 10、捕捉运行很久的SQLcolumn username format

7、 a12 column opname format a16 column progress format a8 select username,sid,opname, round(sofar*100 / totalwork,0) | % as progress, time_remaining,sql_text from v$session_longops , v$sql where time_remaining 0 and sql_address = address and sql_hash_value = hash_value /11。查看数据表的参数信息SELECT partition_n

8、ame, high_value, high_value_length, tablespace_name,pct_free, pct_used, ini_trans, max_trans, initial_extent,next_extent, min_extent, max_extent, pct_increase, FREELISTS,freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,last_analyzed

9、FROM dba_tab_partitions-WHERE table_name = :tname AND table_owner = :townerORDER BY partition_position12.查看还没提交的事务select * from v$locked_object;select * from v$transaction;13。查找object为哪些进程所用select p.spid,s.sid,s.serial# serial_num,s.username user_name,a.type object_type,s.osuser os_user_name,a.owner

10、,a.object object_name,decode(sign(48 - command),1,to_char(command), Action Code # | to_char(command) ) action,p.program oracle_process,s.terminal terminal,s.program program,s.status session_status from v$session s, v$access a, v$process p where s.paddr = p.addr ands.type = USER and a.sid = s.sid and

11、a.object=SUBSCRIBER_ATTRorder by s.username, s.osuser14。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.stat

12、us 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 rownum15。耗资源的进程（top session）select s.schemaname schema_name, decode(sign(48 - command), 1, to_char(command), Action Code # | to_

13、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 and st.statistic# =

14、 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 asc16。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 enque

15、ue 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

16、.type, l.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s, v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner SYS order by o.owner, o.object_name17。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

17、 v$sysstat.name IN (db block gets, consistent gets) group by v$waitstat.class, v$waitstat.count18。查看sga情况SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC19。查看catched objectSELECT owner, name, db_link, namespace, type, sharable_mem, loads, executions, locks, pins, kept FROM v$db_object_cache2

18、0。查看V$SQLAREASELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS, VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS, USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS, DISK_READS,BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA21。查看object分类数量select de

19、code (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

20、 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(

21、o.type#, 6, 1, NULL) sequences, sum(decode(o.type#, 1, NULL, 2, NULL, 3, NULL, 4, NULL, 5, NULL, 6, NULL, 1) others from sys.obj$ o, sys.user$ u where o.type# = 1 and u.user# = o.owner# and u.name PUBLIC group by u.name order by sys.link$ union select CONSTRAINT , count(*) from sys.con$23。有关connecti

22、on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 mem

23、ory, 0 max_memory, 0 cpu_usage, s.sid, s.serial# serial_num from v$session s, v$process p where s.paddr=p.addr and s.type = USER order by s.username, s.osuser2）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.stati

24、stic# order by n.class, n.statistic#3）根据sid查看对应连接正在运行的sqlselect /*+ 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, dis

25、k_reads, buffer_gets, rows_processed,sysdate start_time,sysdate finish_time, | address sql_address,N status from v$sqlareawhere address = (select sql_address from v$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.byt

26、es_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.byt

27、es) 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

28、 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_name25. 查询表空间的碎片程度 select tablespace_name,count(tablespace_name) from dba_free_space group by tablespace_name having count(tablespace_name)10; alter

29、 tablespace name coalesce; alter table name deallocate unused; create or replace view ts_blocks_v as select tablespace_name,block_id,bytes,blocks,free space segment_name from dba_free_space union all select tablespace_name,block_id,bytes,blocks,segment_name from dba_extents; select * from ts_blocks_v; select tablespace_name,sum(bytes),max(bytes),count(block_id) from dba_free_space group by tablespace_name;26。查询有哪些数据库实例在运行select inst_name from v$active_instances;