正在阅读:提高ORACLE数据库的查询统计速度(2)提高ORACLE数据库的查询统计速度(2)

2004-04-01 13:26 出处:搜狐IT 作者:刘亚波 责任编辑:huangpeidan
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;
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