Mysql slave invalidating query cache entries table

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If you want to check the master's binary log or slave's relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' on this slave.

mysql_long_quarys SELECT url, owner FROM phurl_urls WHERE BINARY code = 'BSFz TEub';# Time: 130629 # [email protected]: sam117_crypt[sam117_crypt] @ localhost []# Thread_id: 13 Schema: sam117_crypt# Query_time: 0.002139 Lock_time: 0.000052 Rows_sent: 1 Rows_examined: 9006 Rows_affected: 0 Rows_read: 9006SELECT url, owner FROM phurl_urls WHERE BINARY code = '3LKm8i Qt';# [email protected]: sam117_crypt[sam117_crypt] @ localhost []# Thread_id: 14 Schema: sam117_crypt# Query_time: 0.002205 Lock_time: 0.000052 Rows_sent: 1 Rows_examined: 9006 Rows_affected: 0 Rows_read: 9006SELECT url, owner FROM phurl_urls WHERE BINARY code = 'OIv4K1gb';# [email protected]: sam117_crypt[sam117_crypt] @ localhost []# Thread_id: 15 Schema: sam117_crypt# Query_time: 0.002200 Lock_time: 0.000052 Rows_sent: 1 Rows_examined: 9006 Rows_affected: 0 Rows_read: 9006SELECT url, owner FROM phurl_urls WHERE BINARY code = 'Z8ze DBv E'; phurl_urls code id , code - .

For example, consider a product catalog table with a column of “product_id.” The application issues select or update queries to retrieve or update data from the table using “product_id.” Scale Arc uses the “product_id” value as the metadata to tag the cache objects internally.

This chapter explains how to optimize My SQL performance and provides examples.

Mechanism forcleaning cache entries deletes them always, when any table from cached queryis modified.

I think, it would be better to clean it only, when relevantcolumns (those, used in the query) are changed ( in case of anydelete/insert of course).

Suggested fix: I've switched to statement based replication now to see if that resolves the issue.

I'm discounting #38551 as this happened more than once since after turning the query cache off.

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First because i dont't see the servers processing anything, and second, because as i mentiomed in update4, the server stops processing and gets stuck on invalidating cache on the old non-Percona servers which caused the replication to halt until the cache was invalidated (Which took a lot of time).In theory, the cache exists to speed up your application by responding to the same query with results directly from memory instead of parsing, optimizing, and re-executing the query against the database.However, the query cache is only useful in certain scenarios.It may seem counterintuitive, but for some types of applications, the query cache, especially if set to be large, can reduce performance.My SQL’s query cache stores the results of previously executed queries.

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