oracle常用语句总结

oracle常用语句总结
表空间扩展，创建表空间。。。

1、oracle查询表中的最新10条数据select * from testdataa1004 t where rownum<=10 order by primarykey desc2、将查询结果放入到新表中create table aa4 as select * from testdataa1004 t where primarykey='2014-09-1210:06:269'3、oracle把数据结果导入到另一个表中insert into testdata select * from aa t4、创建表空间create tablespace heatpump     loggingdatafile 'D:\app\Administrator\oradata\orcl\USERS02.DBF'                                                                                size 50mautoextend onnext 50m maxsize 20480mextent management local;5、查询表空间select tablespace_name, file_id, file_name,round(bytes/(1024*1024),0) total_spacefrom dba_data_filesorder by tablespace_name6、扩展表空间alter tablespace USERS   add datafile 'D:\APP\ADMINISTRATOR\ORADATA\ORCL\USERS01.DBF' size 10240M 

AMERICAN_AMERICA.AL32UTF8程序集：externalWSAssembly = WSHelper.GetWSAssembly(externalWSUrl)externalWSClassType = externalWSAssembly.GetType(externalWSClassName, True, True)            externalWSClassName = DataComponent.GetWSClassName(Me.externalWSUrl)            externalWSAssembly = WSHelper.GetWSAssembly(externalWSUrl)            externalWSClassType = externalWSAssembly.GetType(externalWSClassName, True, True)            externalWSClassInstance = Activator.CreateInstance(externalWSClassType)            externalWSMethodInfo = externalWSClassType.GetMethod("getTestProdInfoItem")            externalWSMethodResult = externalWSMethodInfo.Invoke(externalWSClassInstance, Nothing)1、查看表空间详细信息select * from dba_data_files order by tablespace_name2、创建表空间：create tablespace HEATPUMP  logging  datafile 'E:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\heatpump01.DBF' size 200m  autoextend on  next 200m maxsize unlimited  extent management local;3、查看当前用户每个表占用空间的大小：select t.tablespace_name, segment_name,sum(bytes)/1024/1024 from user_extents t group by segment_name,t.tablespace_name4.修改表的空间alter table TABLE_NAME move tablespace TABLESPACENAME查询当前用户下的所有表select t.tablespace_name,  'alter table  '|| table_name ||'  move tablespace tablespacename;'  from user_tables t;5.修改表的索引的空间alter index INDEX_NAME rebuild tablespace TABLESPACENAME查询当前用户下的所有索引select t.tablespace_name, 'alter index '|| index_name ||' rebuild tablespace tablespacename;' from user_indexes t;--创建表空间create tablespace hr2  logging  datafile 'E:\oracle\product\10.2.0\oradata\test\hr2_data1.dbf' size 80m  autoextend on  next 200m maxsize 20480m  extent management localblocksize 8k;--默认8K，可以修改，其作用见"三"中说明; --alter tablespace USERS add datafile 'E:\oracle\product\10.2.0\oradata\USER_data3.dbf' size 200m autoextend on next 200m maxsize unlimited;--创建表--SENSORVALUE blobcreate table TESTDATA2(  PRIMARYKEY  CHAR(30) not null,  HOWLONG     FLOAT not null,  SENSORVALUE varchar2(4000) )tablespace TBS_USER  pctfree 10  initrans 1   storage  (    initial 20M    minextents 1    maxextents unlimited  );-- Create/Recreate primary, unique and foreign key constraints ，注意修改默认表空间alter table TESTDATA2  add constraint PK_TESTDATA_2 primary key (PRIMARYKEY, HOWLONG); --tablespace TBS_USER;--删除表空间drop tablespace TBS_USER including contents;drop tablespace TBS_USER including contents;--DROP TABLESPACE "index01" INCLUDING CONTENTS  AND DATAFILES CASCADE CONSTRAINTS;DROP TABLESPACE HR2 INCLUDING CONTENTS  AND DATAFILES CASCADE CONSTRAINTS; --HR1,HR2,TBS_USERalter database datafile 'E:\oracle\product\10.2.0\oradata\TBS_USER_DATA1.dbf' offline drop;--1、查询当前系统中正在执行的sql: SELECT osuser, username, sql_text from v$session a, v$sqltext b where a.sql_address =b.address order by address, piece;--4、oracle 查看已经执行过的sql 这些是存在共享池中的：select * from v$sqlarea t order by t.LAST_ACTIVE_TIME desc;--5、【获取oracle前10条最耗资源的sql语句】：SELECT * FROM  (SELECT PARSING_USER_ID EXECUTIONS,SORTS,COMMAND_TYPE, DISK_READS,sql_text  FROM  v$sqlarea     ORDER BY disk_reads DESC  )  WHERE ROWNUM<11;  --表空间详细信息 select * from dba_data_files order by tablespace_name--查看表空间使用情况select dbf.tablespace_name,dbf.totalspace "总量(M)",dbf.totalblocks as 总块数,dfs.freespace "剩余总量(M)",dfs.freeblocks "剩余块数",(dfs.freespace / dbf.totalspace) * 100 "空闲比例" from (select t.tablespace_name,sum(t.bytes) / 1024 / 1024 totalspace,sum(t.blocks) totalblocks from dba_data_files tgroup by t.tablespace_name) dbf,(select tt.tablespace_name,sum(tt.bytes) / 1024 / 1024 freespace,sum(tt.blocks) freeblocks from dba_free_space ttgroup by tt.tablespace_name) dfswhere trim(dbf.tablespace_name) = trim(dfs.tablespace_name);--查看表占用空间情况select segment_name,sum(bytes)/1024/1024 from user_extents group by segment_name;----查询表空间的数据文件SELECT * FROM dba_data_files WHERE tablespace_name = 'USERS';--查询出表空间对应的数据文件，在磁盘空间允许的情况下ALTER DATABASE  DATAFILE 'E:\oracle\product\10.2.0\oradata\orcl\USERS_2.DBF' RESIZE 15000M; --如果表空间需要自动扩展或者有最大值限制的ALTER DATABASE datafile 'E:\oracle\product\10.2.0\oradata\orcl\USERS_2.DBF' autoextend ON NEXT 100M maxsize 20000M; --另外，查看用户对表空间的使用限额：如果maxsize 字段值为 -1，则是无限制，如果有其他值，则该值是最大值SELECT * FROM user_ts_quotas;--查看用户下的所有表select 'alter table  '|| table_name ||'  move tablespace tablespacename;'  from user_all_tables; --查询当前用户下的所有索引 select 'alter index '|| index_name ||' rebuild tablespace tablespacename;' from user_indexes; select count(*) from testdata2;select max(t.howlong) from testdata2 t;select min(t.howlong) from testdata2 t;select t.PRIMARYKEY,HOWLONG  from testdata2 t  order by howlong;select t.PRIMARYKEY,HOWLONG,t.SENSORVALUE  from testdata2 t  where t.howlong<0.0003;truncate table testdata2;--select t.PRIMARYKEY,HOWLONG,sensorvalue  from testdata2 t where t.howlong <0.00008 order by howlong;select * from v$session_wait_history;select * from v$sqlarea;--查看当前的等待事件select * from v$session_wait where event = 'direct path read temp';select count(*) from sensorconfig;