Shulou(Shulou.com)06/01 Report--

Small experiment, turn on flashback and turn off flashback.

12c RAC flashback environment

In fact, the rvwr process is started in the background, and then a flashback directory is automatically created, and then the flashback log is written. When we temporarily want to clean the flashback log, just turn off the flashback log, the system will automatically delete the flashback log.

SYS@orcl1 > alter database flashback off;Database altered.

Read the log.

2018-01-06 01-06 09 DATADG/ORCL/FLASHBACK/log_1.355.964691155Deleted Oracle managed file 46V 44.618000 + 08:00RVWR shutting down-- close the process Deleted Oracle managed file + DATADG/ORCL/FLASHBACK/log_1.355.964691155Deleted Oracle managed file + DATADG/ORCL/FLASHBACK/log_2.357.964691159Flashback Database Disabled Completed: alter database flashback off

Look at the asm directory

ASMCMD [+ datadg/orcl/flashback] > lslog_1.355.964691155log_2.357.964691159ASMCMD [+ datadg/orcl/flashback] > lsASMCMD-8002: entry 'flashback' does not exist in directory' + datadg/orcl/'ASMCMD [+ datadg/orcl/flashback] >

Start flashback

SYS@orcl1 > alter database flashback on;Database altered.SYS@orcl1 >

Look at the log, it is actually the acquired process to start RVWR

Alter database flashback onStarting background process RVWRRVWR started with pid=33, OS id=17582-- start the process 2018-01-06 0908:00Flashback Database Enabled at SCN 11549479Completed 51purl 26.483000 + 08:00Flashback Database Enabled at SCN 11549479Completed: alter database flashback on

Asm automatically creates directories

ASMCMD [+ datadg/orcl/flashback] > ls-lType Redund Striped Time Sys NameFLASHBACK UNPROT COARSE JAN 06 09:00:00 Y log_1.357.964691481FLASHBACK UNPROT COARSE JAN 06 09:00:00 Y log_2.355.964691483ASMCMD [+ datadg/orcl/flashback] >

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