herb

-- ²é¿´ORACLE Êý¾Ý¿âÖб¾Óû§ÏµÄËùÓбí
SELECT table_name FROM user_tables;

-- ²é¿´ORACLE Êý¾Ý¿âÖÐËùÓÐÓû§ÏµÄËùÓбí
select user,table_name from all_tables;

-- ²é¿´ORACLE Êý¾Ý¿âÖб¾Óû§ÏµÄËùÓÐÁÐ
select table_name,column_name from user_tab_columns;

-- ²é¿´ORACLE Êý¾Ý¿âÖб¾Óû§ÏµÄËùÓÐÁÐ
select user,table_name,column_name from all_tab_columns;

-- ²é¿´ORACLE Êý¾Ý¿âÖеÄÐòÁкÅ
select * from user_sequences;

-- ÉÏÃæµÄËùÓжÔÏ󣬶¼¿ÉÒÔͨ¹ýÏÂÃæµÄSQLÓï¾ä²éѯµÃµ½
-- ²éѯËùÓеÄÓû§Éú³ÉµÄORACLE¶ÔÏó
SELECT * FROM user_objects;

-- ²é¿´ORACLE Êý¾Ý¿âÖÐËùÓбíµÄ×¢ÊÍ
select table_name,comments from user_tab_comments;

-- ²é¿´ORACLE Êý¾Ý¿âÖÐËùÓÐÁеÄ×¢ÊÍ
select table_name,column_name,comments from user_col_comments;

-- ¸ø±í¼ÓORACLEµÄ×¢ÊÍ
COMMENT ON TABLE aa10 IS 'ϵͳ²ÎÊý±í';

-- ¸øÁмÓORACLEµÄ×¢ÊÍ
COMMENT ON COLUMN aa10.aaa100 IS '²ÎÊýÀà±ð';

-- ²é¿´±íÖÐÁеÄÊôÐÔ£¬°üÀ¨ Êý¾ÝÀàÐÍ£¬ÊÇ·ñ·Ç¿ÕµÈ
DESC aa10;
-- ͨ¹ýϵͳ±í£¬²é¿´±íÖÐÁеÄÊôÐÔ£¬°üÀ¨ Êý¾ÝÀàÐÍ£¬ÊÇ·ñ·Ç¿ÕµÈ
SELECT table_name,COLUMN_ID,column_name,data_type,data_length, DATA_PRECISION,NULLABLE  
  FROM user_tab_columns
ORDER BY table_name,COLUMN_ID;

-- ²é¿´Êý¾Ý¿âÖÐ±í¡¢Ë÷ÒýÕ¼ÓõÄÊý¾Ý¿â¿Õ¼ä´óС
SELECT * FROM user_segments;

-- ²é¿´ËùÓбíµÄ¼Ç¼Êý
CREATE TABLE table_count(table_name VARCHAR2(50),columns NUMBER(20));
-- ͨ¹ýPBÔËÐÐÏÂÃæµÄÓï¾ä£¬µÃµ½½á¹û¼¯£¬½«½á¹û¼¯ÔÚPBÏÂÖ´ÐУ¬×îºóÌá½»
select 'insert into table_count values('''||table_name||''', (select count(1) from '||table_name||'));//'||comments from user_tab_comments;
-- ËùÓбíµÄ¼Ç¼¶¼ÔÚtable_countÁË
SELECT * FROM table_count;

-²é½ø³Ì
select object_id,session_id,locked_mode from v$locked_object;

        select t2.username,t2.sid,t2.serial#,t2.logon_time  
        from v$locked_object t1,v$session t2  
        where t1.session_id=t2.sid order by t2.logon_time;
        
--ɱ½ø³Ì
alter system kill session '3,6666';