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TRANSACTION 0 14548939, ACTIVE 31 sec, process no 6728, OS thread id 1187227984 inserting, thread declared inside InnoDB 500ġ8 lock struct(s), heap size 3024, undo log entries 27 Record lock, heap no 1 PHYSICAL RECORD: n_fields 1 compact format info bits 0Ġ: len 7072656d756d asc supremum RECORD LOCKS space id 0 page no 461340 n bits 608 index `UX_IBLOCK_SECTION_ELEMENT2` of table `mkbase/b_iblock_section_element` trx id 0 14541775 lock_mode X insert intention waiting *** (1) WAITING FOR THIS LOCK TO BE GRANTED: INSERT INTO b_iblock_section_element(IBLOCK_SECTION_ID, IBLOCK_ELEMENT_ID) SELECT S.ID, E.ID FROM b_iblock_section S, b_iblock_element E WHERE S.IBLOCK_ID=E.IBLOCK_ID AND S.ID IN (0,39,38) AND E.ID = 236080

LOCK WAIT 19 lock struct(s), heap size 3024, undo log entries 25 How is deadlock on insert in b_iblock_section_element table linked to updates of our statistical tables (b_stat_day.)?

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Periodically the whole web site is hunging with error on update statistical tables.

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In 4.2.42 and above, these status fields are removed from the index and the queries are optimised for better performance The deadlock is caused by the statuses “locked”, “exception”, “deferred”, and “finished” being accessed in a range lookup index and also being attempted to be updated later in the transaction which causes the cross over. ( See also the related document on database maintenance, with some useful scripts for reducing the size of various tables within the database).įinally if deadlocks are still occurring, ask the Database Administrator to set trace flags 12 on the database and send us the error logs, which will tell us which indexes/tables are deadlocking. Left join BPAWorkQueueItemTag it on t.id = it.tagid In addition, the following SQL script can be used to delete any unused Work Queue tags:- delete t For older versions of Blue Prism, you can run a script to add an index for the Work Queue Items tables to the database.

There are a few things that can be tried, depending on version. The steps below talk about methods to reduce the amount of data in the database – a query won’t show up as being inefficient until there is lots of data to trawl through, so generally they occur in large databases where this is lots of contention from a high number of resource PCs – before reducing the data it’s worth getting the info from the database so we can improve the product ( the related article on database timeouts describes how this can be done in more detail). These don’t have to be records in a table necessarily – they can be locking indexes for update or select in different orders.ĭeadlocks are usually exacerbated by slow running queries, so first step is to get the worst query plans from the DBA and start to look for big table or index scans or CPU intensive loops and joins. The trace flags described in the resolution below will give us this information.

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This means the deadlock victim as reported in the error is only one side of the story – to get the full story we need a deadlock graph from the database server, which shows which two transactions were involved and on which objects they were deadlocked. SQL Server normally kills the cheapest query, the one it will have the least effort in rolling back. The only way out is for SQL Server to kill one of the queries. Process Y can’t get record A until Process X releases it, and Process X can’t release it until it gets record B, hence they are deadlocked.

Deadlocks occur when query X locks records A then B and query Y locks B then A.