1.数据库服务器Database Server 2.数据库实例 Database Instance 3.系统全局区 System Global Area 4.程序全局区 Program Global Area 5.后台进程 Background processes 程序全局区域(PGA)是一个非共享的内存区域,其中包含专门由服务器和后台进程使用的数据和控制信息。Oracle数据库创建服务器进程,以代表客户端程序处...
•闪回缓冲区 (Flashback buffer):是SGA中的可选组件。启用闪回数据库后,将启动称为恢复写程序 (RVWR) 的后台进程。RVWR定期将修改后的块从缓冲区高速缓存复制到闪回缓冲区,然后将闪回数据库数据从闪回缓冲区写入闪回数据库日志,以循环方式重用。 •数据库高速缓冲区 (Database buffer cache):是存储从数据文件...
•闪回缓冲区 (Flashback buffer):是SGA中的可选组件。启用闪回数据库后,将启动称为恢复写程序 (RVWR) 的后台进程。RVWR定期将修改后的块从缓冲区高速缓存复制到闪回缓冲区,然后将闪回数据库数据从闪回缓冲区写入闪回数据库日志,以循环方式重用。 •数据库高速缓冲区 (Database buffer cache):是存储从数据文件...
•数据库高速缓冲区 (Database buffer cache):是存储从数据文件读取的数据块副本的内存区域。缓冲区是主内存地址,缓冲区管理器在其中临时缓存当前或最近使用的数据块。并发连接到数据库实例的所有用户共享对数据库高速缓冲区的访问。 •数据库智能闪存缓存 (Database Smart Flash):是Solaris或Oracle Linux上运行的...
Database instances ARSn ASM Recovery Slave Process Recovers ASM transactional operations The ASM RBAL background process coordinates and spawns one or more of these slave processes to recover aborted ASM transactional operations. These processes run only in the Oracle ASM instance. ...
注意:获得完整的进程列表,请看如下内容:Background Processes. 19、数据库写⼊进程 (DBWn) 数据库写⼊进程(DBWn)是⼀个后台进程,主要将数据块写⼊磁盘。它还处理检查点,⽂件打开同步,以及记录块写⼊记录。配置闪存后,DBWn还将写⼊数据库智能闪存 (闪存) 缓冲区。
The background processes operate on the stored data (data files) in the database and use the memory structures to do their work. A database instance exists only in memory. Oracle Database also creates server processes to handle the connections to the database on behalf of client programs, ...
https://docs.oracle.com/en/database/oracle/oracle-database/19/cwlin/index.html.https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/index.html.For this solution, we installed and configured Oracle Grid Infrastructure and Oracle...
1.Which two statements are true about the PMON background process?A) It kills sessions that exceed idle time.B) It records checkpoint information in the control file.C) It registers database services with all local and remote listeners known to thedatabase instance.D) It frees ...
9 TECHNICAL BRIEF | Oracle Database 19c: Advanced Queuing ❖ The queue table indexes and IOTs are automatically coalesced by AQ background processes. However, they must continue to be monitored and coalesced if needed. From 10.2 onwards, with automatic space segment management (ASSM), an ...