The concept of database persistence, which can be accomplished with a query cache, is designed to improve availability in the Web environment.

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Database persistence refers to the characteristic of data that outlives the process that created it, typically achieved through storing data in databases or other storage systems. Query caching is a technique to improve performance by storing the results of queries for future use, but it does not directly relate to the concept of persistence, which is about ensuring data remains available beyond the lifespan of specific processes or sessions.

The Concept of Database Persistence, Which Can Be Accomplished with a Query