Going from u to v or from v to u? Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 13040 Accepted: 3383 Description In order to make their sons brave, Jiajia and Wind take them to a big cave. The cave has n rooms, and one-way corridors
oracle官网当一个用户发出select..for update的错作准备对返回的结果集进行修改时,如果结果集已经被另一个会话锁定,就是发生阻塞.需要等另一个会话结束之后才可继续执行.可以通过发出 select… for update nowait的语句来避免发生阻塞,如果资源已经被另一个会话锁定,则会返回以下错误:Ora-00054:resource busy and acquire with nowait specified. database运行变慢(transaction事务比较慢):
v$sql V$SQL中存储具体的SQL语句. 一条语句可以映射多个cursor,因为对象所指的cursor可以有不同用户(如例1).如果有多个cursor(子游标)存在,在V$SQLAREA为所有cursor提供集合信息. 例1: 这里介绍以下child cursor user A: select * from tbl user B: select * from tbl 大家认为这两条语句是不是一样的啊,可能会有很多人会说是一样的,但我告诉你不一定,那为什么呢? 这个tblA看起来是一样的,但
Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 17104 Accepted: 4594 Description In order to make their sons brave, Jiajia and Wind take them to a big cave. The cave has n rooms, and one-way corridors connecting some rooms. Each time,
Going from u to v or from v to u? Time Limit: 2000MS Memory Limit: 65536K Description In order to make their sons brave, Jiajia and Wind take them to a big cave. The cave has n rooms, and one-way corridors connecting some rooms. Each tim
Going from u to v or from v to u? Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 17089 Accepted: 4590 Description In order to make their sons brave, Jiajia and Wind take them to a big cave. The cave has n rooms, and one-way corridors