…” is a long-running transaction. If a transaction remains open for a very long time without committing, and has modified data, then other transactions could block… +%s`-innodbstatus pid=$! sleep 30 kill ${pid} fi If this captures anything, then you can simply run “mk-query-digest –type=tcpdump…
Post: How to Monitor MySQL with Percona's Nagios Plugins
February 22, 2012 By 8 Comments
… directory within its data directory. InnoDB is getting stuck, has long-running transactions, or other problems. The pmp-check-mysql-innodb plugin checks… of serious incidents is application misbehavior, such as opening a transaction but never committing it, which creates a lot of bloat…, and refusing to shut down MySQL so that it is killed forcibly (i.e. crashed) instead of gracefully shutting down for…
Comment: How long is recovery from 8G innodb_log_file
December 22, 2010 By 11 Comments
… of scenario that can cause serious problems: someone decides to kill a long-running transaction after say, 4 hours and it takes days to…
Post: ACTIVE with Locks – Now thats a problem !
June 2, 2011 By 2 Comments
… any transactions spending very long time in ACTIVE state. In the perfect world if you’re running online system you should not see transactions… problem waiting to happen, this is when you have long enough ACTIVE transactions which have some locks, like in this case: MySQL… seconds. In this case even if you get rouge transaction it will be killed quickly instead of stalling for potentially many hours.
Post: 10+ Ways to Crash or Overload MySQL
November 13, 2007 By 20 Comments
…each of them using mysql_stmt_send_long_data call – Server buffers such data until…after oldest transactions needing snapshot commits. You can kind of workaround this issue by killing transactions which…variables for unprivileged user which allows to run queries with uncontrolled resource usage. Host …
Post: A quest for the full InnoDB status
October 31, 2008 By 4 Comments
… to MySQL, which often happens when several transactions kill the database performance resulting in very long execution times for even simplest queries, or… do this. There is not such easy way for the long transaction list, but fortunately there are some alternatives to the limited… for every SHOW ENGINE InnoDB STATUS call, so whenever someone runs the command, InnoDB writes the output to that file first…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…_stmt_resetblogpercona.commanual Com_stmt_send_long_datablogpercona.commanual Com_truncateblogpercona.commanual Com_….commanual tmpdirblogpercona.commanual transaction_alloc_block_sizeblogpercona.commanual transaction_isolationblogpercona.commanual transaction_prealloc_sizeblogpercona.commanual …
Post: Estimating Replication Capacity
July 20, 2010 By 4 Comments
… MySQL Server. set userstat_running=1 and run following query: mysql> select *… 119127 OTHER_COMMANDS: 89557 COMMIT_TRANSACTIONS: 90259 ROLLBACK_TRANSACTIONS: 0 DENIED_CONNECTIONS: 1 LOST….67 0 110.38 0 # Killed 0 0 0 0 0 0 …hot” replication capacity as well as how long replication warmup takes. It is …
Post: MySQL Replication vs DRBD Battles
April 28, 2008 By 12 Comments
…run out of sync and have conflicting updates applied to them. With DRBD you have the choice of killing… different nodes. Transaction log replay, yes. But fsck? These days this amounts to running a journal … pick either long recovery time or further degraded performance. In the large databases I run in…
Post: MySQL 5.5.8 - in search of stability
January 3, 2011 By 11 Comments
…I used 30-minute runs, which may not be long enough to see the long-term trend, but … for each run, I will show different graphs: benchmark throughput – This is New Order Transactions per 10… lowering innodb_max_dirty_pages_pct, you are killing your throughput. When you disable innodb_doublewrite, …
