![]() ![]() ![]() However, keep in mind that unindexed scans on MySQL are slow. You could try removing an index (key).You could reduce the number of background threads but this will affect both read and write performance, or.If the problem is not severe, then the best option is generally to retry the transaction in case of deadlock. LATEST DETECTED DEADLOCK - 10:36:37 0x7fe606788700 (1) TRANSACTION: TRANSACTION 492758175, ACTIVE 0 sec starting index read mysql tables in use 1, locked 1 LOCK WAIT 3 lock struct (s), heap size 1136, 3 row lock (s) MySQL thread id 2871743, OS thread handle 140625951213312, query id.In these cases there are three things you can look at doing: This might solve the issue by itself, but I think it might require change 2 below as well. Martin at 5:48 How does inserting a single row cause a deadlock for that insert I was expecting that within a transaction, you need to attempt to acquire at least two locks to deadlock. 'Darwin', 'AUS', 'Northern Territory', 146000) ERROR: 1213: Deadlock found when trying to get lock try restarting transaction Connection 2> ROLLBACK. Questions Why does the query in step 3 get blocking Even though the row in step 3 is not involved in connection 2 (which is issuing IX lock). The problem (as you seem to grasp) is that a thread updating an index can deadlock against another thread that updates an index (and remember, InnoDB tables are indexes with leaf-nodes containing the row data). larsmeldgaard commented on edited Change the index IXJobQueueQueueAndFetchedAt to also include the Id as part of the multi-column index which will make the index unique. 17 /doc/refman/5.1/en/innodb-deadlocks.html - Running 'show engine innodb status' would provide useful diagnostics. MS SQL Server has been known to have similar problems in some cases and workloads. I assume based on your question that the update statement, however, is in its own transaction and therefore there are no complex interdependencies among writes from a logical database perspective.Ĭertain multi-threaded databases (including MySQL) can have single statements deadlock against themselves due to write dependencies within threads on the same query. InnoDB automatically detects transaction deadlocks, rollbacks a transaction immediately and returns an error. in jBPM.properties .dialect.MySQL5InnoDBDialect The db schema is created successfully.In a transaction system, deadlocks are a fact of life and not completely avoidable. MySQLTransactionRollbackException: Deadlock found when trying to get lock. The weewx programs are not stopped during these backups. Code: ERROR (.:1526): An error occurred in channel P_NLA_ADT_GW_IN (3df73330-2b02-4af2-bed5-92de82fe54f0) while processing message ID 13080 from the source queueĬom.data.DonkeyDaoException: .jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock try restarting transactionĪt .updateStatus(JdbcDao.java:722)Īt .executeTasks(BufferedDao.java:107)Īt .commit(BufferedDao.java:74)Īt .commit(BufferedDao.java:56)Īt .(Channel.java:1390)Īt .(Channel.java:1524)Īt .(Channel.java:1511)Īt (Thread.java:701)Caused by: .jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock try restarting transactionĪt 0(Native Method)Īt (NativeConstructorAccessorImpl.java:57)Īt (DelegatingConstructorAccessorImpl.java:45)Īt .newInstance(Constructor.java:534)Īt .handleNewInstance(Util.java:411)Īt .getInstance(Util.java:386)Īt .createSQLException(SQLError.java:1066)Īt .checkErrorPacket(MysqlIO.java:4187)Īt .checkErrorPacket(MysqlIO.java:4119)Īt .sendCommand(MysqlIO.java:2570)Īt .sqlQueryDirect(MysqlIO.java:2731)Īt .execSQL(ConnectionImpl.java:2815)Īt .executeInternal(PreparedStatement.java:2155)Īt .executeUpdate(PreparedStatement.java:2458)Īt .executeUpdate(PreparedStatement.java:2375)Īt .executeUpdate(PreparedStatement.java:2359)Īt .updateStatus(JdbcDao.When dealing with deadlocks, the first thing to do, always, is to see whether you have complex transactions deadlocking against eachother. A deadlock in MySQL happens when two or more transactions mutually hold and request for locks, creating a cycle of dependencies. nvert(MySQLDialect.java:411) hibernate-core-4.2.5. Once a day my weewx MySQL databases are backupped, see log of the backup below. ![]()
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