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Oracle数据字典的学习总结

时间:2021-07-01 10:21:17 帮助过:22人阅读

下面按类别列出一些Oracle用户常用数据字典的查询使用方法。 一、用户 查看当前用户的缺省表空间SQLgt;SELECT username,

下面按类别列出一些Oracle用户常用数据字典的查询使用方法。

一、用户

查看当前用户的缺省表空间SQL>SELECT username,default_tablespace FROM user_users;

查看当前用户的角色SQL>SELECT * FROM user_role_privs;

查看当前用户的系统权限和表级权限SQL>SELECT * FROM user_sys_privs;SQL>SELECT * FROM user_tab_privs;

二、表

查看用户下所有的表SQL>SELECT* FROM user_tables;

查看名称包含log字符的表SQL>SELECT object_name,object_id FROM user_objects WHERE INSTR(object_name,,'LOG')>0;

查看某表的创建时间SQL>SELECT object_name,created FROM user_objects WHERE object_name=UPPER('&table_name');

查看某表的大小SQL>SELECT SUM(bytes)/(1024*1024) AS size(M) FROM user_segments WHERE segment_name=UPPER('&table_name');

查看放在ORACLE的内存区里的表SQL>SELECT table_name,cache FROM user_tables WHERE INSTR(cache,'Y')>0;

三、索引

查看索引个数和类别SQL>SELECT index_name,index_type,table_name FROM user_indexes ORDER BY table_name;查看索引被索引的字段SQL>SELECT * FROM user_ind_columns WHERE index_name=UPPER('&index_name');

查看索引的大小SQL>SELECT SUM(bytes)/(1024*1024) AS size(M) FROM user_segments WHERE segment_name=UPPER('&index_name');

四、序列号

查看序列号,last_number是当前值SQL>SELECT * FROM user_sequences;

五、视图

查看视图的名称SQL>SELECT view_name FROM user_views;

查看创建视图的select语句SQL>SELECT view_name,text_length FROM user_views;SQL>SET long 2000;

//说明:可以根据视图的text_length值设定set long 的大小SQL>SELECT text FROM user_views WHERE view_name=UPPER('&view_name');

六、同义词

查看同义词的名称SQL>SELECT * FROM user_synonyms;

七、约束条件

查看某表的约束条件SQL>SELECT constraint_name, constraint_type,search_condition, r_constraint_name

2 FROM user_constraints WHERE table_name = UPPER('&table_name');

//注意,表名一定是大写才行

SQL>SELECT c.constraint_name,c.constraint_type,cc.column_name

2 FROM user_constraints c,user_cons_columns cc

3 WHERE c.owner = upper('&table_owner')

4 AND c.table_name = UPPER('&table_name')

5 AND c.owner = cc.owner and c.constraint_name = cc.constraint_name 6 ORDER BY cc.position;

八、存储函数和过程

查看函数和过程的状态SQL>SELECT object_name,status FROM user_objects WHERE object_type='FUNCTION';SQL>SELECT object_name,status FROM user_objects WHERE object_type='PROCEDURE';

查看函数和过程的源代码SQL>SELECT text from all_source WHERE owner=user AND name=UPPER('&plsql_name');

九、触发器

查看触发器

SET long 50000;
SET heading off;
SET pagesize 2000;

SELECT

'create or replace trigger ' ||
trigger_name || '' || chr(10)||
DECODE( SUBSTR( trigger_type, 1, 1 ),
'A', 'AFTER', 'B', 'BEFORE', 'I', 'INSTEAD OF' ) ||
chr(10) ||
triggering_event || chr(10) ||
'ON ' || table_owner || '.' ||
table_name || '' || chr(10) ||
DECODE( instr( trigger_type, 'EACH ROW' ), 0, null,
'FOR EACH ROW' ) || chr(10) ,
trigger_body
FROM user_triggers;

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