Oracle维护常用SQL语句

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) 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;

5、查看数据库库对象 　　select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;

6、查看数据库的版本　 　　Select version FROM Product_component_version Where SUBSTR(PRODUCT,1,6)='Oracle' 7、查看数据库的创建日期和归档方式 　　Select Created, Log_Mode, Log_Mode From V$Database;

8、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

9、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

10、查看还没提交的事务 　　select * from v$locked_object; 　　select * from v$transaction; 　　select * from v$session;

11、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(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

12、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

13、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    14、将回车键插入数据库    insert into x values ('at' || chr(10) || 't');