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 desc 2、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 t 4、创建表空间 create tablespace heatpump logging datafile 'D:\app\Administrator\oradata\orcl\USERS02.DBF' size 50m autoextend on next 50m maxsize 20480m extent management local; 5、查询表空间 select tablespace_name, file_id, file_name, round(bytes/(1024*1024),0) total_space from dba_data_files order by tablespace_name 6、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_name 2、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_name 4.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 local blocksize 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 blob create 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_USER alter 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 t group by t.tablespace_name) dbf, (select tt.tablespace_name,sum(tt.bytes) / 1024 / 1024 freespace,sum(tt.blocks) freeblocks from dba_free_space tt group by tt.tablespace_name) dfs where 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;