闪回技术包括闪回查询(Flashback Query)、闪回表(Flashback Table)和闪回数据库(Flashback Database),这些功能使数据库恢复变得更加灵活和高效。 2. 检查闪回功能是否启用 在使用闪回功能之前,您需要首先检查数据库是否启用了闪回功能。可以通过以下SQL语句查询闪回状态: SELECTFLASHBACK_ONFROMV$DATABASE; 2.1 查询结果...
The shared pool is involved in almost every operation that occurs in the database. For example, if a user executes a SQL statement, then Oracle Database accesses the shared pool. Flashback buffer: Is an optional component in the SGA. When Flashback Database is enabled, the background ...
•闪回缓冲区 (Flashback buffer):是SGA中的可选组件。启用闪回数据库后,将启动称为恢复写程序 (RVWR) 的后台进程。RVWR定期将修改后的块从缓冲区高速缓存复制到闪回缓冲区,然后将闪回数据库数据从闪回缓冲区写入闪回数据库日志,以循环方式重用。 •数据库高速缓冲区 (Database buffer cache):是存储从数据文件...
SQL> alter system set db_recovery_file_dest='/u01/app/oracle/flashback'; System altered. 启用数据库闪回 SQL> alter database flashback on; Database altered. SQL> select flashback_on from V$database; FLASHBACK_ON --- YES SQL> show parameter flash; NAME TYPE VALUE --- --- --- db_...
https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/user-managed-database-backups.html#GUID-2193FAD0-F62C-4671-9272-55E8BD7367DC 30.2.1 About User-Managed Restore and Recovery https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/user-managed-flashback-db...
After upgrading database to 19c where flashback is enabled and when a guaranteed restore point is...
•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...
Configuring Flashback Database Data management Memory management Plugging in tablespaces and creating external tables Manage tablespaces Managing Partitioning Configuration that allows searching of previous versions of data Star query optimization Managing materialized views ...
– With Oracle Database 19c, flashback operations are propagated to the standbys automatically • Requires that the standbys are configured for flashback database and in MOUNT state first • Standbys must have the same or larger setting for DB_FLASHBACK_RETENTION_TARGET Copyright © 2018,...
Oracle 19c: Automatic flashback in standby following primary database flashback When flashback or point-in-time recovery is performed on the primary database, a standby that is in mounted mode can automatically follow the same recovery procedure performed on the primary ...