Semi-Join Example #2 I recently worked on a project where applying the concepts presented in this section brought the execution time for a key query in my client’s application down from 46 minutes t ...

dba_tab_privs：用户的对象权限（不仅仅是表的权限，所有对象的权限都包含在里面）dba_sys_privs：用户的系统权限 dba_role_privs：用户的角色 我们可能还想知道角色包含的权限 role_role_privs role_sys_privs ro ...

Prerequisites and Hints that Impact Semi-Joins There are a few situations in which Oracle cannot use a semi-join access path. If the query contains a DISTINCT operation (explicitly or implicitly thro ...

The EXISTS and IN Constructs In this section we will discuss how Oracle evaluates EXISTS and IN clauses, prerequisites for using Oracle’s semi-join access paths, and hints that influence semi-join q ...

首先找出库里大于1G的表，作为监视的对象，大约有80个。 我们库里的表是每天一更新。我想在每天更新所有后，记录下监视表的当天的状态，包括表的记录数、表的大小（单位G）、表对应索引大小（单位G），放在一个统计 ...

今天面试，公司问到关于数据清洗的问题。请OCM们给点高见！

switchover 一切正常 DGMGRL> show configuration verbose Configuration - FSF Protection Mode: MaxAvailability Databases: test_p - Primary database test_s - (*) Physical standby database ...

win32位 oracl11 4g内存 这个是和内存有关系 还是和 客户端占用缓存有关系呀 weep Incident[256341]: completed Thu Feb 17 22:10:07 2011 Restarting dead background process DIA0 Thu Feb 17 22:10:07 2011 ...