Sql lock table while updating

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Unfortunately it’s not that simple, your isolation level plays a large part as well.In this case we know which queries caused the deadlock, but we could’ve gotten the same information using the profiler.

An API website, exposing a series of webservices, had been working fine for months, until I decided to run my client app with a lot more threads than usual.The SQL standard defines three consistency anomalies (phenomena): anomaly and that’s what we are going to discuss in this current article.Most database systems use Read Committed as the default isolation level (My SQL using Repeatable Read instead).Wait behaviour and conflict reporting depend on the transaction parameters specified in the TPB block: If a record is modified by any transaction that was committed since the transaction attempting to get explicit lock started, or an active transaction has performed a modification of this record, an update conflict exception is raised immediately.If the record is modified by any transaction that has committed since the transaction attempting to get explicit lock started, an update conflict exception is raised immediately.

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