rowlocking

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When exactly MySQL locks a row on updating InnoDB table?

If I have this multiupdate query UPDATE user u INNER JOIN user_profile up ON up.user_id = u.id SET u.name = \'same_name_i_already_had\', up.profile.age = 25[详细]

2023-03-16 12:18 分类：问答
SELECT FOR UPDATE and WHERE condition on two indexed columns - what's locking strategy?

This question is a logical continuation of this one: How many rows will be locked by SELECT ... ORDER BY xxx LIMIT 1 FOR UPDATE?[详细]

2023-02-27 10:56 分类：问答
How many rows will be locked by SELECT ... ORDER BY xxx LIMIT 1 FOR UPDATE?

I have a query with the following structure: SELECT ..... WHERE status = \'QUEUED\' ORDER BY position ASC LIMIT 1 FOR UPDATE;[详细]

2023-02-25 23:20 分类：问答
MS-SQL Server selecting rows, locking rows. Unique returns

I\'m selecting the available login infos from a DB randomly via the stored procedure below. But when multiple threads want to get the available login infos, duplicate records are returned although I\'[详细]

2023-02-25 19:53 分类：问答
Rowlock and lock escalation

I\'m trying to use rowlock to prevent certain rows being updated while it\'s running but the problem is that I can\'t use the tables at all while running this:[详细]

2023-02-08 07:27 分类：问答
How to use rowlock and readpast with NHibernate?

I have an application which currently reads data from a table using the following stored procedure: CREATE PROCEDURE [dbo].[GetBatchOfEmails][详细]

2023-02-03 10:37 分类：问答
SQL Server ROWLOCK over a SELECT if not exists INSERT transaction

I have upgraded from SQL Server 2005 to 2008. I remember that in 2005, ROWLOCK simply did not work and I had to use PAGELOCK or XLOCK to achieve any type of actual locking. I know a reader of this wil[详细]

2023-01-29 02:22 分类：问答
"Atomic section" in Ruby MongoDB driver?

Is there a way to perform a set of non-atomic actions on MongoDB server (using the Ruby driver) as an single atomic action? What I need is basically a lo开发者_如何学Pythonck on certain object/collect[详细]

2023-01-26 01:54 分类：问答
Long queue times for oracle row locks

I keep r开发者_JAVA百科unning into \"enq: TX - row lock contention\", when I run the Sql command below in a oracle 9 DB.[详细]

2022-12-22 20:05 分类：问答
MySQL InnoDB locking only the affected rows?

I have an InnoDB table containing users, like this: +--------------+-----------------------+ user_id| name|[详细]

2022-12-09 01:46 分类：问答