Concurrency erro when deleteing or updating multiple key field totally personals internet dating

Concurrency erro when deleteing or updating multiple key field

For locking performed on My SQL files by other programs, see Section 8.11.5, “External Locking”.

tables to support simultaneous write access by multiple sessions, making them suitable for multi-user, highly concurrent, and OLTP applications.

For every t-shirt, the website shows the current balance of up votes vs down votes.

To illustrate the situation, let's assume we have a website which people use to rate t-shirt design. It lists all designs and allows users to either give a design a thumbs up or vote them down using a thumbs down icon.Deadlocks affect performance rather than representing a serious error, because automatically detects deadlock conditions and rolls back one of the affected transactions.On high concurrency systems, deadlock detection can cause a slowdown when numerous threads wait for the same lock.To avoid deadlocks when performing multiple concurrent write operations on a single statement for each group of rows expected to be modified, even if the data change statements come later in the transaction.If transactions modify or lock more than one table, issue the applicable statements in the same order within each transaction.

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By Tom Dykstra and Rick Anderson The Contoso University sample web application demonstrates how to create ASP.

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