oracle常用经典SQL查询常用SQL查询：1、查看表空间的名称及大小selectt.tablespace_name,round(sum(bytes/(1024*1024)),0)ts_sizefromdba_tablespacest,dba_data_filesdwheret.tablespace_name=d.tablespace_namegroupbyt.tablespace_name;2、查看表空间物理文件的名称及大小selecttablespace_name,file_id,file_name,round(bytes/(1024*1024),0)total_spacefromdba_data_filesorderbytablespace_name;3、查看回滚段名称及大小selectsegment_name,tablespace_name,r.status,(initial_extent/1024)InitialExtent,(next_extent/1024)NextExtent,max_extents,v.curextCurExtentFromdba_rollback_segsr,v$rollstatvWherer.segment_id=v.usn(+)orderbysegment_name;4、查看控制文件selectnamefromv$controlfile;5、查看日志文件selectmemberfromv$logfile;6、查看表空间的使用情况selectsum(bytes)/(1024*1024)asfree_space,tablespace_namefromdba_free_spacegroupbytablespace_name;SELECTA.TABLESPACE_NAME,A.BYTESTOTAL,B.BYTESUSED,C.BYTESFREE,(B.BYTES*100)/A.BYTES"%USED",(C.BYTES*100)/A.BYTES"%FREE"FROMSYS.SM$TS_AVAILA,SYS.SM$TS_USEDB,SYS.SM$TS_FREECWHEREA.TABLESPACE_NAME=B.TABLESPACE_NAMEANDA.TABLESPACE_NAME=C.TABLESPACE_NAME;7、查看数据库库对象selectowner,object_type,status,count(*)count#fromall_objectsgroupbyowner,object_type,status;8、查看数据库的版本SelectversionFROMProduct_component_versionWhereSUBSTR(PRODUCT,1,6)='Oracle';9、查看数据库的创建日期和归档方式SelectCreated,Log_Mode,Log_ModeFromV$Database;10、捕捉运行很久的SQLcolumnusernameformata12columnopnameformata16columnprogressformata8selectusername,sid,opname,round(sofar*100/totalwork,0)||'%'asprogress,time_remaining,sql_textfromv$session_longops,v$sqlwheretime_remaining<>0andsql_address=addressandsql_hash_value=hash_value/11。查看数据表的参数信息SELECTpartition_name,high_value,high_value_length,tablespace_name,pct_free,pct_used,ini_trans,max_trans,initial_extent,next_extent,min_extent,max_extent,pct_increase,FREELISTS,freelist_groups,LOGGING,BUFFER_POOL,num_rows,blocks,empty_blocks,avg_space,chain_cnt,avg_row_len,sample_size,last_analyzedFROMdba_tab_partitions--WHEREtable_name=:tnameANDtable_owner=:townerORDERBYpartition_position12.查看还没提交的事务select*fromv$locked_object;select*fromv$transaction;13。查找object为哪些进程所用selectp.spid,s.sid,s.serial#serial_num,s.usernameuser_name,a.typeobject_type,s.osuseros_user_name,a.owner,a.objectobject_name,decode(sign(48-command),1,to_char(command),'ActionCode#'||to_char(command))action,p.programoracle_process,s.terminalterminal,s.programprogram,s.statussession_statusfromv$sessions,v$accessa,v$processpwheres.paddr=p.addrands.type='USER'anda.sid=s.sidanda.object='SUBSCRIBER_ATTR'orderbys.username,s.osuser14。回滚段查看selectrownum,sys.dba_rollback_segs.segment_nameName,v$rollstat.extentsExtents,v$rollstat.rssizeSize_in_Bytes,v$rollstat.xactsXActs,v$rollstat.getsGets,v$rollstat.waitsWaits,v$rollstat.writesWrites,sys.dba_rollback_segs.statusstatusfromv$rollstat,sys.dba_rollback_segs,v$rollnamewherev$rollname.name(+)=sys.dba_rollback_segs.segment_nameandv$rollstat.usn(+)=v$rollname.usnorderbyrownum15。耗资源的进程（topsession）selects.schemanameschema_name,decode(sign(48-command),1,to_char(command),'ActionCode#'||to_char(command))action,statussession_status,s.osuseros_user_name,s.sid,p.spid,s.serial#serial_num,nvl(s.username,'[Oracleprocess]')user_name,s.terminalterminal,s.programprogram,st.valuecriteria_valuefromv$sesstatst,v$sessions,v$processpw...
