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This article mainly explains the "oracle dg switching operation example tutorial", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor to take you to learn the "oracle dg switching operation example tutorial"!

Background: disaster preparedness drills in response to disasters, failures and other cutoff situations, including master / standby switching and accidental host downtime.

1. Master / Slave switching (switch over)

#

# primary operation

#

1) confirm how the host is turned on

SQL > select DATABASE_ROLE,PROTECTION_MODE,open_mode from v$database

2) switch to standby mode

SQL > ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY

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# standby operation

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1) cancel the application of slave log

SQL > alter database recover managed standby database cancel

2) switch to host mode

SQL > ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY

3) restart the slave library

SQL > SHUTDOWN IMMEDIATE

SQL > STARTUP

#

# primary operation

#

1) restart the main library

SQL > SHUTDOWN IMMEDIATE

SQL > STARTUP MOUNT

2) adjust to "READ ONLY" status

SQL > alter database open

3) Application log

SQL > alter database recover managed standby database using current logfile disconnect

4) confirm that open_mode is "READ ONLY WITH APPLY"

SQL > select open_mode from v$database

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# test Test

#

Insert data on the original machine to test whether it is received by the original host.

2. Main library downtime (failover)

#

# primary operation

#

$ps-ef | grep pmon

$kill-9 {pid_pmon}

#

# standby operation

#

Cancel standby log application

Standby SQL > ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL

Standby SQL > alter database recover managed standby database finish

"if standby redolog is not applied, use the following command here:

Standby SQL > alter database recover managed standby database finish skip standby logfile

2) restart db to mount status

Standby SQL > shutdown immediate

Standby SQL > startup mount

3) switch to host mode

Standby SQL > alter database commit to switchover to primary

Standby SQL > alter database open

#

# test Test

#

Test whether the original machine can be connected and count the lost data.

If it is Oracle rac, you need to close a node during the switching operation. The method is the same.

At this point, I believe that everyone on the "oracle dg switching operation sample tutorial" have a deeper understanding, might as well to the actual operation of it! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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