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by devit 3932 days ago
In PostgreSQL, you can set the SERIALIZABLE isolation level for the whole database, put a retry loop around all database transactions and completely stop worrying about concurrency issues.

I think all database applications should be written like this at least until performance starts being an issue.
2 comments
anarazel 3932 days ago
Entirely depends on the the type of workload / application architecture. In some cases the rollback ratios will be massive (I've seen 70%). In other cases adding such a retry loop is unattractive because the latency jitter. Or retaining all involved data for a retry is unattrictive.

Yet Another problem is that you need to enforce all sessions potentially involved in a data race need to use serializable; that can be easy or hard, depending on the scenario.

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jpgvm 3932 days ago
Use UPSERT, it's correct -and- fast rather than just correct.

Increasing the transaction isolation level shouldn't be done out of laziness.

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