2019年5月8日 · To help developers investigate the update conflicts, Firebird puts into error messages the reference to the concurrent transaction – i.e., the transaction where the concurrent update is not yet committed. Together with Trace API, it gives us the ability to track both conflicting operations.

2012年10月9日 · When users leave another client application opened it leaves deadlock on some records (opened by users). The problem is with my application that must complete the query above. Is it possible to implement some kind of solution to forcebly remove deadlocks? For example an SQL query? Firebird version is 2.1.2.18118 running on Windows 7

If you designed your system in such way that deadlocks happen often, consider using NO WAIT transactions, so that you get the error instantly instead of waiting for deadlock timeout. If you perceive deadlock as a problem you cannot solve, look into selecting a different isolation modes for transactions in your application.

2019年5月8日 · Update conflicts (often called «deadlocks») occur in Firebird applications which perform intensive concurrent updates of data. As you can see from the article « Transactions in Firebird », there are 3 types of errors which contain the keyword «deadlock»:

2019年5月28日 · A "deadlock update conflicts with concurrent update" happens when multiple transaction want to modify the same row. Only one updater can really change the row and commit. As long as the first transaction hasn't committed, the update in the second transaction will wait (indefinitely or until the configured timeout).

2014年7月31日 · The term deadlock is a bit of a misnomer here, it is actually an update conflict. You might want to specify the exact transaction options you use, because in Firebird this error is more common when you use the no_rec_version option in combination with read committed (as opposed to rec_version ).

2008年9月14日 · 开发人员正在寻找最好的方法来识别特定线程中特定事务的死锁。 我们正在收到死锁错误，但这些错误在FB2.0中非常普遍. 死锁发生，它们导致客户端和DB之间的DB连接崩溃。 我们向DB发送实时 (每秒一次)数据。 我们打开大约30个线程的线程池，并使用它们摄取数据 (大约每秒1-2 kB )。 有时DB只能占用这么多，所以我们使用池中的下一个线程来尽可能地保持流的电流。 有时，除了达到最大线程数和断开连接之外，这还会产生死锁。 所以我们真的需要关于这 …

2019年4月8日 · Pay attention to the word "deadlock" in the error message – now there is actually no deadlock according to its classic definition. Instead, there is an update conflict, but Firebird developers do not change the error message because it has been used for more than 35 years.

Firebird Conference 2011, Luxembourg 2 Synchronization in Firebird Internal vs external locks Mutexes, spinlocks, RW locks, latches Lock manager Features of the global locks Multiple states (SR, PR, SW, PW, EX) Blocking notifications Deadlock detection Monitoring abilities

The WITH LOCK feature, added in Firebird 1.5, provides a limited explicit pessimistic locking capability for cautious use in conditions where the affected row set is: extremely small (ideally, a singleton), and