计算机程序设计VFP

链表的实现-list 5 C-API MySQL之起始第二人生的源码分析

select min(bitmapped) from ts$ where dflmaxext =:1 and bitand(flags, 1024) = 1024

GOOGLE了下，发现有人说这是个bug，登陆到METALINK上查询，发现果然是个bug，描述如下：
Applies to:
Oracle Server - Enterprise Edition - Version: 10.1 to 10.2

This problem can occur on any platform.

Symptoms
After the introduction of temporary tablespace groups following query using a lot of CPU and executed many times
select min(bitmapped) from ts$ where dflmaxext =:1 and bitand(flags, 1024) = 1024.

Cause
Temp tablespace group uses a recursive query on ts$ to get the minimum extent size among its temp tablespaces.

Solution1> Use single temp tablespace as user's temp tablespace.
Solution2> Apply patch for the bug 5455880

使用这个东西的优点：
防止一个临时表空间出现空间不足的问题。
同一个用户同时连接多个session时可以使用不同的临时表空间。
在并行操作中可以并行使用多个临时表空间