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1、Oracle维护常用SQL语句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) tota
2、l_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$rollstat v Where r.segment_id = v.usn(+) order by segment_
3、name ; 4、查看控制文件 select name from v$controlfile; 5、查看日志文件 select member from v$logfile; 6、查看表空间的使用情况 select sum(bytes)/(1024*1024) as free_space,tablespace_name from dba_free_space group by tablespace_name; SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE, (B.BYTES*100)/A.BYTES % USE
4、D,(C.BYTES*100)/A.BYTES % FREE FROM SYS.SM$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 Se
5、lect 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$Database; 10、捕捉运行很久的SQL column username format a12 column opname format a16 column progress format a8 select username,sid,opname, round(sofar*100 / totalwork,0) %
6、 as progress, time_remaining,sql_text from v$session_longops , v$sql where time_remaining 0 and sql_address = address and sql_hash_value = hash_value / 11、查看数据表的参数信息 SELECT partition_name, high_value, high_value_length, tablespace_name, pct_free, pct_used, ini_trans, max_trans, initial_extent, next_
7、extent, min_extent, max_extent, pct_increase, FREELISTS, freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks, empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size, last_analyzed FROM dba_tab_partitions -WHERE table_name = :tname AND table_owner = :towner ORDER BY partition_position 12、查看
8、还没提交的事务 select * from v$locked_object; select * from v$transaction; 13、查找object为哪些进程所用 select p.spid, s.sid, s.serial# serial_num, s.username user_name, a.type object_type, s.osuser os_user_name, a.owner, a.object object_name, decode(sign(48 - command), 1, to_char(command), Action Code # to_char(com
9、mand) ) action, p.program oracle_process, s.terminal terminal, s.program program, s.status session_status from v$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 14、回滚段查看 select rownum, sys.dba_ro
10、llback_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$rollname.name(+)
11、= sys.dba_rollback_segs.segment_name and v$rollstat.usn (+) = v$rollname.usn order by rownum 15、耗资源的进程（top session） select s.schemaname schema_name, decode(sign(48 - command), 1, to_char(command), Action Code # to_char(command) ) action, status session_status, s.osuser os_user_name, s.sid, p.spid ,
12、s.serial# serial_num, nvl(s.username, Oracle process) user_name, s.terminal terminal, s.program program, st.value criteria_value from v$sesstat st, v$session s , v$processp 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