提高ORACLE数据库的查询统计速度(2)

发表于:2007-06-22来源:作者:点击数: 标签:
下一页 1 2 1. 设置五个回滚段的 SQL 语句如下: SELECT SEGMENT_NAME FROM DBA_ROLLBACK_SEGS WHERE INITIAL_EXTENT UPPPER(OWNER) = 'PUBLIC'; SELECT UPPER(STATUS) FROM DBA_ROLLBACK_SEGS WHERE UPPER(SEGMENT_NAME) = '' ALTER ROLLBACK SEGMENT RB1 O

下一页 1 2 

     1. 设置五个回滚段的SQL语句如下:
  
  SELECT SEGMENT_NAME FROM DBA_ROLLBACK_SEGS WHERE INITIAL_EXTENT < 512000 AND
  UPPPER(OWNER) = 'PUBLIC';
  SELECT UPPER(STATUS) FROM DBA_ROLLBACK_SEGS WHERE UPPER(SEGMENT_NAME) = ''
  

  ALTER ROLLBACK SEGMENT RB1 OFFLINE;
  ALTER ROLLBACK SEGMENT RB2 OFFLINE;
  ALTER ROLLBACK SEGMENT RB3 OFFLINE;
  ALTER ROLLBACK SEGMENT RB4 OFFLINE;
  ALTER ROLLBACK SEGMENT RB5 OFFLINE;
  
  DROP ROLLBACK SEGMENT RB1;
  DROP ROLLBACK SEGMENT RB2;
  DROP ROLLBACK SEGMENT RB3;
  DROP ROLLBACK SEGMENT RB4;
  DROP ROLLBACK SEGMENT RB5;
  
  CREATE PUBLIC ROLLBACK SEGMENT RB1 TABLESPACE ROLLBACK_DATA
   STORAGE (INITIAL 512000 NEXT 512000 MAXEXTENTS 121);
  CREATE PUBLIC ROLLBACK SEGMENT RB2 TABLESPACE ROLLBACK_DATA
   STORAGE (INITIAL 512000 NEXT 512000 MAXEXTENTS 121);
  CREATE PUBLIC ROLLBACK SEGMENT RB3 TABLESPACE ROLLBACK_DATA
   STORAGE (INITIAL 512000 NEXT 512000 MAXEXTENTS 121);
  CREATE PUBLIC ROLLBACK SEGMENT RB4 TABLESPACE ROLLBACK_DATA
   STORAGE (INITIAL 512000 NEXT 512000 MAXEXTENTS 121);
  CREATE PUBLIC ROLLBACK SEGMENT RB5 TABLESPACE ROLLBACK_DATA
   STORAGE (INITIAL 512000 NEXT 512000 MAXEXTENTS 121);
  
  ALTER ROLLBACK SEGMENT RB1 ONLINE;
  ALTER ROLLBACK SEGMENT RB2 ONLINE;
  ALTER ROLLBACK SEGMENT RB3 ONLINE;
  ALTER ROLLBACK SEGMENT RB4 ONLINE;
  ALTER ROLLBACK SEGMENT RB5 ONLINE;
  
  COMMIT;

原文转自:http://www.ltesting.net