PostgreSQL and the OOM Killer: Why You Must Use Strict Memory Overcommit

According to Ubicloud, PostgreSQL running on Linux faces a hidden threat: the kernel's out-of-memory killer. This mechanism terminates processes when memory runs low—indiscriminately. With lenient memory settings, the OOM killer can abruptly terminate your entire database to free up RAM, causing outages and data loss. The fix? Enable strict memory overcommit on Linux. This prevents the kernel from allowing allocations that can't be guaranteed, forcing applications like PostgreSQL to fail gracefully instead of crashing unexpectedly. For production databases on Linux, this configuration change is essential—it's the difference between a managed failure and a surprise disaster.

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