With regard to the mode of transport SYNC

Version: 11.2.0.3
Operating system: Unix/Linux platforms

I'm new to Data guard

It's that I understood on the SYNC mode after googling and read 11.2 doc. correct me if I'm wrong.

SYNCHRONIZATION (synchronous Transport Mode)
======================

With the transmission SYNCHRO mode, LGWR is not allowed to recognize that a commit succeeded until the LNS confirms that it again to retrieve the transaction was written to the Redo logs waiting in the standby.
Until LGWR extracted this confirmation of LNS, the database is suspended and the validation operation is supported. That is to say. In the event of failure of a network between the (primary) production database and the standby database which prevents the
again to be written in the newspapers waiting to roll forward, then the primary database will block.

SYNCHRONIZATION method is also referred to as method "Zero data loss.

But there is an attribute called NET_TIMEOUT for LOG_ARCHIVE_DEST_n parameter; Assigned (in seconds) decides how long LGWR should wait to hear from LNS on scripture to redo in Standby Redo Logs.

The default value at 11.2 is 30 seconds. After 30 seconds, if LGWR cannot hear the LNS on a succesfull write to redo in Standby Redo Logs, process LGWR disconnects from the LNS and acknowledges the primary VERIFICATION and allow
DB primary to continue treatment even if he can no longer communicate with the day before.

This isn't strictly "zero data loss" as a VALIDATION has been recognized in the primary despite the entrance of again as a result of this change is not written for the eve SRL. Right?



Question2.

In all our Prod DBs, LOG_ARCHIVE_DEST_2 is set to the value below. No idea what type of protection is this DB in?
    MAXIMUM PROTECTION
    or
    MAXIMUM AVAILABILITY
    or
    MAXIMUM PERFORMANCE ?
service="HEWRMS_DG", LGWR SYNC AFFIRM delay=0 optional compression=disable max_failure=0 max_connections=1 reopen=300 db_unique_name="HEWRMS_DG" net_timeout=30, valid_for=(all_logfiles,primary_role)

This isn't strictly "zero data loss" as a VALIDATION has been recognized in the primary despite the entrance of again as a result of this change is not written for the eve SRL. Right?

You'll only no loss of data if you have maximum protection. If the primary is unable to reach the day before, it stops after a fixed delay. Oracle recommend two standby mode if you want maximum protection.

In available maximum primary will try to reach the previous day in the net_timeout value and whether it will commit the transaction and move. It will essentially drop down for maximum performance until it can connect to the waiting again.

Check the mode of protection of data.

select protection_mode from v$database;

Should read: you only have the guarantee of no data loss with maximum protection. You have no data loss with maximum availability until your watch and network are correct.

Published by: Freddie Essex on 5 June 2013 11:18

Tags: Database

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