oracle 常用命令

 

--查询表的大小

select t.owner,

       t.segment_name,

       (sum(t.blocks) * 8) / 1024 || 'M' as S,

       t.segment_type

  from dba_segments t

 where t.owner = 'USER_NAME'

 group by t.owner, t.segment_name, t.segment_type

 order by t.owner, S desc

 

--修改表所在表空间

 

select T.owner,  t.segment_name, t.tablespace_name --, sum(t.blocks)

  from dba_segments t

 where t.owner = 'USER_NAME'

ORDER BY T.owner

 

select 'alter table ' || t.TABLE_NAME || ' move tablespace BIP_TS;' from user_all_tables t

select 'alter index '|| index_name ||' rebuild tablespace BIP_TS;' from user_indexes; 

 

--查看索引是否生效

 

  select index_name, index_type, tablespace_name, table_type, status

  from user_indexes t

 where t.tablespace_name = 'TABLESPACENAME'

   and status = 'UNUSABLE'

 

-- 清空回收站

 

purge recyclebin;

 

--查询建表语句

 

select dbms_metadata.get_ddl('TABLE','UNIEAP_REPORT_CATEGORY') FROM DUAL

 

select DBMS_METADATA.GET_DDL('TABLESPACE','BIP_TS') FROM DUAL

 

--获取授权信息

 

select dbms_metadata.get_granted_ddl('SYSTEM_GRANT') from dual;

 

--查询表空间使用率的语句

select a.a1 表空间名称,

       c.c2 类型,

       c.c3 区管理,

       b.b2 / 1024 / 1024 表空间大小M,

       (b.b2 - a.a2) / 1024 / 1024 已使用M,

       substr((b.b2 - a.a2) / b.b2 * 100, 1, 5) 利用率

  from (select tablespace_name a1, sum(nvl(bytes, 0)) a2

          from dba_free_space

         group by tablespace_name) a,

       (select tablespace_name b1, sum(bytes) b2

          from dba_data_files

         group by tablespace_name) b,

       (select tablespace_name c1, contents c2, extent_management c3

          from dba_tablespaces) c

 where a.a1 = b.b1

   and c.c1 = b.b1;

 

--修改分区名

 

alter table TABLE_NAME rename partition OLD_PARTITION_NAME to NEW_PARTITION_NAME;

 

--查询分区脚本

select TABLE_NAME ,PARTITION_NAME from user_tab_partitions where table_name like '%'

select TABLE_NAME ,PARTITION_NAME from user_tab_partitions where table_name like '%'

--查询索引脚本

SELECT INDEX_NAME,TABLE_NAME FROM USER_INDEXES WHERE INDEX_NAME LIKE '%'

 

--查看oracle连接用户

select s.USERNAME,s.MACHINE from v$session s where s.STATUS = 'ACTIVE'

 

--查看oracle最大连接数

select value from v$parameter where name = 'processes'

 

--修改最大连接数:

alter system set processes = 300 scope = spfile;

 

--给表添加字段

ALTER TABLE table_name add (col_name varchar2(32));

--修改表字段

ALTER TABLE table_name MODIFY (col_name  datatype [default value][null/not null]);

--删除表字段

ALTER TABLE table_name DROP (col_name);