backup-County-after-writebehind - how is it useful for a write-back cache?

We have been consistent 12.1.2 and we use a writeback of a backup-County 1 cache system, and we persist in all the cache entries in the database with a write delay of 2 seconds.

We stumbled upon this backup-County-after-writebehind element in the "distributed-scheme" scheme, and the recommended value is ZERO for this.

Our use of the writeback cache is only for store entries / remain, but not to get it from the database, on a lack of cache (no call load() is taken through our store of custom cache).

The question is - what happens if the cache node (FMV) fails or leaves the cluster. The data in the cache will be lost, because the backup-County-after-writebehind is ZERO? Or the data will be safe because the number of backup is set to 1? 


If the data is lost because backup-County-after-writebehind is zero, the data will be safe if we define to, say, 1? Otherwise, what is the use of this element, then?

Please notify.


Hello

If you set backup-County-after-writebehind = 1, then it is actually the same as the default 1 backup setting. You would not normally set this value higher than your normal backup account settings, for example, it would be unwise to have backup-count = 0 and backup-County-after-writebehind = 1. As I said the backup-County-after-writebehind setting are mainly so you can sae space of bunch of the cluster that you need not keep a backup if you can retrieve a value from the database.

If a node falls down or leave the cluster and you have a backup-count = 1 (or backup-County-after-writebehind = 1) then you should not lose data because there will be a backup on another Member of the cluster.

JK

Tags: Fusion Middleware

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