… (in memory) COMMIT–>write (a delta?) to innodb-log-file AND write statements to binary (replication) log AND THEN . . . . do whatever is necessary… all buffered dirty pages were flushed, then InnoDB has to use its log files to synchronize the tablespace files because obviously anything in…
Comment: MySQL Crash Recovery
August 2, 2006 By 30 Comments
In “Binary log corruption”, you say “In MySQL 5.0 XA is taking care of this synchronization“. If you know any document or URL about synchronization between binary log and InnoDB log w/ innodb_support_xa, would you like to tell me? Does MySQL AB Document refer to this synchronization?
Post: Percona XtraDB Cluster reference architecture with HaProxy
June 20, 2012 By 63 Comments
…-112-39-98 log_slave_updates innodb_locks_unsafe_for_binlog=1 innodb_autoinc_lock_mode=2 innodb_buffer_pool_size=400M innodb_log_file_size… disabled. 120619 13:21:17 InnoDB: The InnoDB memory heap is disabled 120619 13:21:17 InnoDB: Mutexes and rw_locks use GCC… JOINED -> SYNCED (TO: 105) 120619 13:21:20 [Note] WSREP: Synchronized with group, ready for connections For debugging information about the…
Post: Adaptive checkpointing
November 13, 2008 By 9 Comments
… “age” — As you know again, because InnoDB write the modifies of datafile to transaction log file synchronously, InnoDB is allowed to treat its buffer pool as write-back cache. The transaction log from the last…
Post: MySQL 5.0, 5.1 and Innodb Plugin CPU Efficiency
December 3, 2008 By 15 Comments
… by older Innodb versions. Note: These are completely CPU bound test conditions, data fits to buffer pool furthermore data and logs are… with 8 cores and has less performance – this usually shows synchronization is the issue. Barracuda format uses more CPU while delivering… can have 2 cases when waiting on mutexes and other synchronization objects – either everything waits so there is not enough runnable…
Post: Beware: ext3 and sync-binlog do not play well together
January 21, 2009 By 19 Comments
… 2 threads it drops to 610 transactions/sec Because of synchronous serialized writes to binlog we’re not expecting significant improvements… to the binary log. Innodb transactional log does not have the same problem on EXT3. I expect this is because Innodb log is pre-allocated so there is not need to modify meta data with each write while binary log is…
Post: Using Flexviews - part two, change data capture
March 25, 2011 By 26 Comments
… identify rows that have changed Triggers to capture changes synchronously Database log reading to capture the changes asynchronously The first method has… *************************** 1. row *************************** server_id: 999 master_log_file: binary_log.000001 master_log_size: 214652 exec_master_log_pos: 214652 If you select from….demo ( > c1 int auto_increment primary key, > c2 int > ) > engine=innodb; Query OK, 0 rows affected (0.00 sec) mysql> insert…
Comment: Product to try: MySQL/MariaDB-Galera 0.8
June 13, 2011 By 34 Comments
… incremental backup is actually doing the same thing, just from innodb log… For performance penalty, it is an interesting question how do… argue that the proper comparison is single node with both innodb_flush_log_at_trx_commit=1 and sync_binlog=1, and… durability may not care (but why then would they want synchronous replication at all?) So comparing performance with Galera against single…
Comment: Using LVM for MySQL Backup and Replication Setup
January 16, 2009 By 53 Comments
Trying to decide if I want to move away from innodb hot backup. 1) I saw that I can skip the… my Innodb tables, but I also noticed the warning: “If you’re using only Innodb tables and do not need to synchronize binary log… the binary log postion sync mentioned above create a problem? 2) I have a mix of MyISAM and Innodb, but mostly Innodb, is…
Comment: Effect from innodb log block size 4096 bytes
January 4, 2011 By 19 Comments
Vadim/Dimtry, If InnoDB doesn’t synchronously write log blocks upon a transaction COMMIT (or hold a number of …
