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    Mysql state invalidating

    =========================================================== ----------- | version() | ----------- | 5.5.17 | ----------- 1 row in set (0.00 sec) -------------------------- ------------------- | Variable_name | Value | -------------------------- ------------------- | binlog_format | STATEMENT | | date_format | %Y-%m-%d | | datetime_format | %Y-%m-%d %H:%i:%s | | default_week_format | 0 | | innodb_file_format | Antelope | | innodb_file_format_check | ON | | innodb_file_format_max | Antelope | | time_format | %H:%i:%s | -------------------------- ------------------- 8 rows in set (0.00 sec) *************************** 1. These statements and the others you show are how replication keeps the slave thread's environment sane as it moves from event to event. Just changing to Barracuda won't make anything different...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. */; # at 444601987 # at 444602072 # at 444603110 # at 444604148 # at 444605186 # at 444606224 # at 444607262 # at 444608300 # at 444609338 # at 444610372 # at 444611410 # at 444612448 # at 444613486 =========== EDIT : 28th March,2013 ======== *************************** 1.

    mysql state invalidating-58

    Try Alon, you seem to be making lots of different accounts, which is making editing your question harder.

    That is, even if the query cache is not enabled, the mutex (slow, by nature) to access the (not existing) query cache is acquired for every binlog event.

    The only way to not acquire the query cache mutex in My SQL pre-5.5 is to compile My SQL without query cache. For My SQL 5.5 , to completely disable the query cache (thus, not acquiring the query cache mutex) is required to set query_cache_type=OFF at startup (not at runtime).

    That is related to a known bug, fixed in My SQL 5.5 :

    id=38551In short, in all My SQL versions before 5.5 , the query cache mutex is acquired even if query_cache_size=0 and query_cache_type=OFF : always!

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