Mysql state invalidating mars and venus dating tips

row *************************** Slave_IO_State: Waiting for master to send event Master_Host: dware-master Master_User: replica Master_Port: 3306 Connect_Retry: 60 Master_Log_File: binlog.001620 Read_Master_Log_Pos: 328943038 Relay_Log_File: relay-bin.000109 Relay_Log_Pos: 444602036 Relay_Master_Log_File: binlog.001607 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: 444601893 Relay_Log_Space: 7062540762 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: 32298 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 1 row in set (0.00 sec) === -------------------------------- ------- | Variable_name | Value | -------------------------------- ------- | flush | OFF | | flush_time | 0 | | innodb_adaptive_flushing | ON | | innodb_flush_log_at_trx_commit | 2 | | innodb_flush_method | | -------------------------------- ------- 5 rows in set (0.00 sec) =============== ------------------- ------- | Variable_name | Value | ------------------- ------- | log_slave_updates | OFF | ------------------- ------- 1 row in set (0.00 sec) === [[email protected] binlog]# mysqlbinlog -v --base64-output=DECODE-ROWS --start-position=444601893 binlog.001607 | head -30 /*! */; SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*! They're normal, and there's really nothing to see here... although if your real problem on the slave is a disk I/O bottleneck, and if you have sufficient memory and cpu, then you could on selected Inno DB tables after enabling Barracuda and possibly eliminate some bottleneck because on-disk compression should mean less disk I/O, but means more demand on CPU as well as more demand on the Inno DB Buffer Pool, which will try to store both the compressed and uncompressed versions of some pages.40019 SET @@session.max_insert_delayed_threads=0*/; /*! 50003 SET @[email protected]@COMPLETION_TYPE, COMPLETION_TYPE=0*/; DELIMITER /*! */; # at 444601893 #130323 server id 1 end_log_pos 444601987 Query thread_id=216095 exec_time=1 error_code=0 SET TIMESTAMP=1364099743/*! */; SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*! But the first step is to identify what about is making it slow. You should have it available but it should be all free, or almost all free. Is anything else on the system competing for resources? I'm currently working on a My SQL database where we are seeing a large number of invalidations from the query cache, primarily because of the high number of INSERT, DELETE and UPDATE statements that are being executed on many of the tables.What I'm trying to determine is whether or not there is any benefit at all to allowing the query cache to be used for SELECT statements that are being run against these tables.How to repeat: I believe this might have something to do with row based replication of large tables.Rows: ~49,917,839 Inno DB latin1_swedish_ci Size: 28.7 Gi B I've now yet been able to repeat with 100% accuracy.row *************************** Slave_IO_State: Waiting for master to send event Master_Host: isp-db-mysql-1infra Master_User: slave Master_Port: 3306 Connect_Retry: 60 Master_Log_File: isp-db-mysql-1.052619 Read_Master_Log_Pos: 3138691 Relay_Log_File: isp-db-mysql-1-relay-bin.000002 Relay_Log_Pos: 32861 Relay_Master_Log_File: isp-db-mysql-1.052556 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: 8109731 Relay_Log_Space: 6642282995 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: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: 1 row in set (0.01 sec) mysql show engine innodb status\G *************************** 1.

- Initially, Seconds_behind_master was increasing but after a restart, it shows 0 (zero).Any help as to how best to test my theory would be greatly appreciated.Suggested fix: I've switched to statement based replication now to see if that resolves the issue.Since they get invalidated so quickly, it seems to me the best thing would be to just use SQL_NO_CACHE on SELECT statements with these tables.Is the overhead of frequent invalidation ever worth it? The Query Cache will always butt heads with Inno DB.For more information on how Inno DB interacts with the query cache, please read pages 213-215 of the book "High Performance My SQL (Second Edition)".

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