How to get the updated value once the database is in place?

Hello

I have a scenario which is explained below.

I have values from the DB for the first time and then consecutive application gets the value of the cache if the key is the same.
One application is to apply. At that time, certain values change in the DB and then the DB is declining.

Once the DB will get the new value of the cache. I tried this but I got the value from the cache (obtained only old value). The key is the same in DB, I changed the value and tested it.

Is wot in the way that I am doing is correct? The same thing happens when I put the value in cache when DB is out of service.
Will the data get updated as soon as the DB is in place? Also, this is not the case when I tested.

I made the scenario above using distributed cache with manual configuration file that uses dumps.


Thank you
Mitraa SP

Published by: SPM 6 November 2009 01:14

The cache of almost is a "cache cache", then it can expire items out of its cache of 'before' (the local cache on the JAVA virtual machine running the code that requests information from the cache close), but which does not expire items in the cache 'return', which is the distributed cache.

Caches are assembled in a hierarchical way, your configuration is something like this:

1. a "cache near" which consists of a "local cache" (expiration) front and a back "distributed cache.
2. the "distributed cache" that has a "reading / writing support map" for its data storage
3. the "reading / writing map support" that delegates to a "Cache" store to talk to a database and a "Cache internal" for its storage
4. the "internal cache' is probably configured as a storage card by default (which has not expired)

To make data expire so that he is re-read, simply change the definition of "internal cache" in the read/write backup plan to use a similar setup that you use on the front of the cache close.

For example, the example configuration file "coherence-cache-config. XML"(found in coherence.jar), you can change this"1 h"to 10"s"and expiration will occur in 10 seconds instead of an hour:



  example-binary-backing-map

  HYBRID
  {back-size-limit 0}
  BINARY
  {back-expiry 1h}
  1m

  




  example-read-write

  
    
      example-binary-backing-map
    
  

  

  true
  0s

For an explanation of these braces, see: [coherence Configuration Macros | http://coherence.oracle.com/display/COH35UG/Parameter+Macros].

Peace,

Cameron Purdy | The Oracle coherence
http://coherence.Oracle.com/

Tags: Fusion Middleware

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