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oracle常用的几个数据库信息查询

news 来源：原创 2024/5/17 16:54:34

oracle常用的几个数据库信息查询，包括表空间、表大小、索引、分区、用户、字段、连接数等数据库信息。

--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
--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'
--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;
--修改表字段
ALTER TABLE table_name MODIFY (col_name datatype [default value][null/not null]);
--给表添加字段
ALTER TABLE table_name add (col_name varchar2(32));
--删除表字段
ALTER TABLE table_name DROP (col_name);
-- 清空回收站
purge recyclebin;