Invalidating query cache entries table replication


01-Aug-2017 18:31

invalidating query cache entries table replication-83

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After it is created, the invalidation ID starts its journey across multiple components, products and servers to ensure that all the cache entries associated to the invalidation ID are removed.With a failed invalidation, you are presented the challenge to understand which exact component is breaking, which can become a very time consuming task, and require the use of relatively expensive logging and tracing.If the cache instance is configured to replicate invalidations, the DRS component creates invalidation messages and relies on the High Availability manager to distribute them to the other servers in the cluster.The process in the Search servers is a bit different.

When the Dyna Cache Invalidation scheduler job runs, it looks for new entries in CACHEIVL and issues the invalidations to Dynacache.My SQL のレプリケーションは、安定稼働やバックアップ、負荷分散などの目的に利用できる優れた機能です。 bin-log (バイナリログ) を利用して Master サーバから Slave サーバに更新を伝播させ、データの複製を行います。Slave サーバでは、2 つのスレッドが動作しています。 IO_THREAD – Master から送られてきたデータを受け取り、relay-log (リレーログ) として書き出す SQL_THREAD – relay-log を読み出し、DB を更新するshow slave status \G *************************** 1.row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.12.2 Master_User: replicator Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000024 Read_Master_Log_Pos: 198822658 Relay_Log_File: relay-bin.000048 Relay_Log_Pos: 198730937 Relay_Master_Log_File: mysql-bin.000024 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 1980774 Relay_Log_Space: 1983035 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 265 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 1 Master_UUID: Master_Info_File: SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: invalidating query cache entries (table) Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 show master status \G" Warning: Using a password on the command line interface can be insecure. There is no scheduler and therefore no Dyna Cache Invalidation job.

invalidating query cache entries table replication-51

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As requests are received, the Search servers look into the CACHEIVL table for updates and processes them.1、子查询或者外层查询; 2、存储过程、存储函数、触发器、event中调用的SQL,或者引用到这些结果的; 3、包含一些特殊函数时,例如:BENCHMARK()、CURDATE()、CURRENT_TIMESTAMP()、NOW()、RAND()、UUID()等等; 4、读取mysql、INFORMATION_SCHEMA、performance_schema 库数据的; 5、类似SELECT…LOCK IN SHARE MODE、SELECT…FOR UPDATE、SELECT..



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