oracle数据库中常用经典SQL查询

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oracle数据库中常用经典SQL查询 时间：2015/6/28来源：绿色软件之家作者：网管联盟我要评论(0)

　　1、查看表空间的名称及大小

　　select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size

　　from dba_tablespaces t, dba_data_files d

　　where t.tablespace_name = d.tablespace_name

　　group 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_space

　　from dba_data_files

　　order 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/1024) NextExtent,

　　max_extents, v.curext CurExtent

　　From dba_rollback_segs r, v$rollstat v

　　Where 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_space

　　group 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 "% FREE"

　　FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C

　　WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;

　　7、查看数据库库对象

　　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SQL

　　column username format 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_name, 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

　　FROM dba_tab_partitions

　　--WHERE table_name = :tname AND table_owner = :towner

　　ORDER BY partition_position

　　12.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,

　　a.object object

　　_name,

　　decode(sign(48 - command),

　　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 and

　　s.type = 'USER' and

　　a.sid = s.sid and

　　a.object='SUBSCRIBER_ATTR'

　　order by s.username, s.osuser

#p#副标题#e#

　　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 and st.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.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_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

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