oracle 常用語句

oracle 常用語句

--查詢表的大小

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

--修改表所在表空間

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; 

--檢視索引是否生效

select index_name, index_type, tablespace_name, table_type, status

from user_indexes t

where t.tablespace_name = 'tablespacename'

and status = 'unusable'

-- 清空**站

purge recyclebin;

--查詢建表語句

select dbms_metadata.get_ddl('table','unieap_report_category') from dual

select dbms_metadata.get_ddl('tablespace','bip_ts') from dual

--獲取授權資訊

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

--查詢表空間使用率的語句

select a.a1 表空間名稱,

c.c2 型別,

c.c3 區管理,

b.b2 / 1024 / 1024 表空間大小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;

--修改分割槽名

alter table table_name rename partition old_partition_name to new_partition_name;

--查詢分割槽指令碼

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 '%'

--查詢索引指令碼

select index_name,table_name from user_indexes where index_name like '%'

--檢視oracle連線使用者

select s.username,s.machine from v$session s where s.status = 'active'

--檢視oracle最大連線數

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

修改最大連線數:

alter system set processes = 300 scope = spfile;

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