Oracle 数据库分析

一、数据库分析

二、表的分析

1.分析表
exec dbms_stats.gather_table_stats('SFISM4','R_SN_DETAIL_T',CASCADE=>TRUE);
exec dbms_stats.gather_table_stats('ISMP','MAPI_ASYNC_NOTIFY',degree => 8,estimate_percent=> 100,cascade=>true);
2.分析分区表
exec dbms_stats.gather_table_stats(ownname =>'ISMP',tabname => 'MAPI_ASYNC_NOTIFY',degree => 8,estimate_percent=> 100,cascade=>true);
exec dbms_stats.gather_table_stats(ownname =>'ISMP',tabname => 'MAPI_ASYNC_NOTIFY',degree => 8,estimate_percent=> 100,method_opt => 'for all indexed columns' ,cascade => true);

三、直方图