June 18, 2013

Comment: Connecting orphaned .ibd files

…, Thanks for feedback. > May 16 14:19:30 debian /etc/mysql/debian-start[14967]: Triggering myisam-recover for all MyISAM tables… 3 log sequence number 20 1214354523 > May 16 14:19:30 debian mysqld: InnoDB: is in the future! Current system log sequence number 0 56436… stop mysqld, remove ibdata1 and ib_logfile* files. Then start MySQL, InnoDB will create a new tablespace. At this point the…

Comment: Connecting orphaned .ibd files

… and following messages : May 16 14:19:30 debian /etc/mysql/debian-start[14967]: Triggering myisam-recover for all MyISAM tables… 3 log sequence number 20 1214354523 May 16 14:19:30 debian mysqld: InnoDB: is in the future! Current system log sequence number 0 56436… May 16 14:19:30 debian mysqld: InnoDB: http://dev.mysql.com/doc/refman/5.1/en/forcing-recovery.html May…

Post: Innodb Fuzzy checkpointing woes

… of LSN (Log Sequence Number) for the pages which basically corresponds to age of unflushed pages. In such case current implementation works just… problem Innodb has – too many hard coded numbers.  For example Innodb will count number of IOs done to see how much… it to constant.  However the shared drive at shared MySQL virtual hosting and powerful RAID system may have very different…

Post: Edge-case behavior of INSERT...ODKU

…) ) ENGINE=InnoDB; Now consider the following sequence of events. (root@localhost) [test]> INSERT …that the AUTO_INCREMENT counter is currently set to 2. If we do an…considered as being defined first. So, MySQL checks our INSERT, sees that …again by 86400, which is the number of seconds in a day, and…

Post: Innodb Double Write

…page number for the operation as well as operation data (ie update the row) and log sequence information…which page version it is – it could be “current” version in which case Innodb will skip …buffer. How much does double write buffer affect MySQL Performance ? Even though double write requires each …