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OCP-052考试题库汇总（29）-CUUG内部解答版
When does an incremental checkpoint occur ? A)when an online redo log switch occurs. B)when DBWn writes dirty buffers as part of its normal processing. C)when the ALTER SYSTEM CHECKPOINT statement is executed. D)when a user tablespace is tabken offline. AOCP-052考试题库汇总（18）-CUUG内部解答版
Which two events always request the LGWR to write? A)When DBWn writes dirty buffers. B)When a log switch occurs. C)When a checkpoint occurs. D)When LGWR is notified by a server process that performs a COMMIT or ROLLBACK. E)When PMON restarts a serve proceOracle数据库体系结构之内存结构（4）
Oracle进程结构包括用户进程，服务进程，后台进程。 1. 用户进程 用户进程在数据库用户要求连接到Oracle服务器时开始启动。 用户进程是要求Oracle服务器交互的一种进程 它必须首先建立一个连接 不直接和Oracle服务器交互 2. 服务进程 服务进程连接Oracle实例，当用户建立一个会话