Is this declaration for the creation of correct active standby pair?

Hi, I have two servers, one is "baal" and the other is "diablo".
I want to create a pair of active standby with the RETURN of TWOSAFE and disable the BACK after that 5 times timeout happens and resume BACK if less than 8 ms recognize.
I do not sure if 8 ms is reasonable if the starting node is far behind the active node (assuming the starting node is to hardware failure).
Here's my response:
--------------------------------
PAIR of EVE ACTIVE CREATE eppdb WE "baal", eppdb ON "diablo."
RETURN TWOSAFE
STORE eppdb WE 'baal '.
DISABLE THE BACK EVERY 5
CURRICULUM VITAE OF RETURN 8;
-------------------------------
Is what I'm not clear on the key word "STORE."
I noticed that there are a lot of 'STORE' after RETURN of TWOSAFE and make that confused me for a while.
If this assertion is false, please correct me.

Thank you.

In fact, these options apply to the store level so that the statement is as follows:

CREATE A PAIR OF ACTIVE STANDBY
eppdb WE 'baal', eppdb ON TWOSAFE of RETURN "diablo."
STORE eppdb WE 'baal '.
DISABLE THE RETURN ALL 5 HP BACK 20
RETURN SERVICES TURNED OFF WHEN THEY ARE ARRESTED
SUSTAINABLE COMMITMENT ON
COMMIT LOCAL ACTION VALIDATION
WAIT BACK 30 TIMES
STORE eppdb ON "diablo."
DISABLE THE RETURN ALL 5 HP BACK 20
RETURN SERVICES TURNED OFF WHEN THEY ARE ARRESTED
SUSTAINABLE COMMITMENT ON
COMMIT LOCAL ACTION VALIDATION
WAIT BACK 30 TIMES;

All these options and what they mean are described in detail in the (very good) documentation. I would recommend that you read in order to understand that you configure here... Just a summary.

Whenever the wait isn't available, application commits will experience timeouts (TT WARNING 8170). Request code must be prepared to receive and respond to this warning. Finally (according to the options DISABLE RETURN and RETURN WAIT [see below]) TT come back asynchronously and wait times stops. Once sleep is available and the stores are back in sync TT will increase from TWOSAFE BACK mode once again.

DISABLE BACK every 5 - turn off the twosafe return (i.e. emergency in asynchronous mode) treatment after 5 consecutive times (each timeout will be 30 seconds)

BACK to the TIME of WAITING 30 - wait up to 30 seconds (a very long time) for recognition in return for service to the peer

The combination of these two parameters means that in the event of network failure or the eve past active offline will be waiting for about 150 seconds (5 x 3) before disabling the twosafe return processing. During this time of transaction request will be and experience timeouts. I would suggest smaller values such as 2 and 10 maybe but only t = OU can decide what is reasonable for your environment.

SUSTAINABLE if ENGAGING ON - whenever the return services are then disabled, force all commits to be sustainable (synchronous disk). This will degrade performance, but provides continuous data protection when the instance of relief is not available. If you don't want this feature so do not configure (but then when the watch is not available you are exposed to data loss if the assets fails).

RETURN SERVICES OFF when THEY are ARRESTED - disable services return (spend in asynchronous mode) each time the replication agent stops.

LOCAL validation ACTION COMMIT - if a validation Gets a time-out warning (TT8170) then the transaction status is uncertain. The application can choose to engage locally (allowing it to continue the treatment), in which case the txn is committed. will be added to the queue of replication for a (possible) retransmission in asynchronous mode. It is the recommended behavior and is defined by this option. The other option is NO ACTION, which is also the default value. With this option, the application must implement the logic for its own decision, and then call a few specific TT builtin functions to decide how to deal with the uncertain state. This adds significant complexity. Until the application makes a decision, it is impossible to continue.

See the documentation for more information.

Tags: Database

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