RECORD LOCKS space id 1558 page no 909823 n bits 120 index PRIMARY of table `ubimo`. It is important to create good indexes so that your queries do not scan more rows than necessary. INSERT INTO hourly_creative_stats (date_hour,creative_id,campaign_id,placement_id,account_id,won) values (date_format(' 06:56:20.0','%Y-%m-%d %H'),123319,164807,42667,3,1) ON DUPLICATE KEY UPDATE won=won+values(won) If you have no indexes suitable for your statement and MySQL must scan the entire table to process the statement, every row of the table becomes locked, which in turn blocks all inserts by other users to the table. MySQL thread id 594879, OS thread handle 140461163738880, query id 1343761256 172.16.11.48 fe update 2 Deadlock - due to Temp Tables SQLHunt SSC-Dedicated Points: 33518 More actions Apat 1:36 pm 259316 Hi, We have a lot of procedures which internally uses the temp tables. TRANSACTION 3770369751, ACTIVE 0 sec insertingĥ lock struct(s), heap size 1136, 7 row lock(s), undo log entries 6 This affects models with multi-table inheritance, as child models primary key is not auto incremented. Record lock, heap no 12 PHYSICAL RECORD: n_fields 22 compact format info bits 0 We start with creating of three tables and three indexes. RECORD LOCKS space id 1558 page no 909823 n bits 120 index PRIMARY of table `ubimo`.`hourly_creative_stats` trx id 3770369752 lock_mode X locks rec but not gap waiting Solution Recreating the SQL Server Deadlock To demonstrate how the deadlock occurs I am going to have two separate active transactions opened in two connection windows. *** (1) WAITING FOR THIS LOCK TO BE GRANTED: INSERT INTO hourly_creative_stats (date_hour, account_id, campaign_id, creative_id,placement_id, bid) VALUES (date_format(utc_timestamp(),'%Y-%m-%d %H'),3,164807,123318,42667,1) ON DUPLICATE KEY UPDATE bid=bid+values(bid) Just looking at those Deletes, I see two issues - Potentially inefficient way to delete rows. One will be automatically killed (by InnoDB) the other will to the task assigned. Database locking Relational database systems use various locks to guarantee transaction ACID properties. 1 Answer Sorted by: 1 Those two DELETEs are each doing a full table scan looking for certain rows to delete. LOCK WAIT 3 lock struct(s), heap size 1136, 4 row lock(s), undo log entries 3 Introduction In this article, we are going to see how a deadlock can occur in a relational database system, and how Oracle, SQL Server, PostgreSQL, or MySQL recover from a deadlock situation. TRANSACTION 3770369752, ACTIVE 0 sec inserting They said the application should retry the. If a process is unable to change its state indefinitely because the resources requested by it are being used by another waiting process, then the system is said. What's the possible cause of this and how you suggest to solve it? LATEST DETECTED DEADLOCK I think the InnoDB has a time limit and if a transaction exceed it, the transaction will be aborted and rollbacked. I got the deadlock below when running insert into statements.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |