Invalidating query cache entries key
Be aware that caches are not aware of changes made to the persistent store by another application.
Since query_cache_size is protected from any changes by the barrier in Query_cache::resize() we can safely add a test at the begining of the invalidate* functions to avoid having mutexes locked when the query cache is ment to be disabled.Many other programming languages and frameworks are already moving in this direction.This model pulls people toward alternative databases such as Cassandra, Mongo DB, etc.Load-balancer for distributing workloads across multiple computing resources should be used in conjunction with distributed caching system such as memcached, redis, riak ...Because you lose many of the advantages of asynchronous processing in the application tier, if your data access tier still relies on synchronous blocking API's (such as Java's JDBC and JPA).The customer object, for example, maps to the Now, when someone reads or writes to our config value through the backend interface Magento instantiates our newly created model.
Luckily, Magento already provides a model that does this!
Meet Be aware though, Magento considers invalidated cache types as disabled - Instead of showing the wrong thing, it chooses to not use cache at all.
Clean or flush this cache type if your custom module uses logic that results in cache entries that Magento cannot clean.
In the next example, we are going to cache the following query: Query Cache Test - Evict regions and run query Standard Query Cache - Checking cached query results in region: org.hibernate.cache.internal.
Standard Query Cache Ehcache General Data Region - Element for key sql: select querycache0_as id1_1_, querycache0_.author_id as author_i4_1_, querycache0_.created_on as created_2_1_, querycache0_as name3_1_ from Post querycache0_ order by querycache0_.created_on desc; parameters: ; named parameters: ; max rows: 10; transformer: org.hibernate.transform.
(In other words, updates that Magento does not make itself.) One way to update the database schema automatically is using the magento setup:db-schema:upgrade command.