May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Inspecting the log
If your system smells trouble, it makes sense to inspect the log to see what is going on. The important point is this: not all log entries are created equal. PostgreSQL has a hierarchy of log entries that ranges from DEBUG messages to PANIC.
To the administrator, the following three error levels are of great importance:
- ERROR
- FATAL
- PANIC
ERROR is used for problems such as syntax errors, permission-related problems, and so on. Your log will always contain error messages. The critical factor is: how often does a certain type of error show up? Producing millions of syntax errors is certainly not the ideal strategy to run a database server.
FATAL is more scary than ERROR; you will see messages such as could not allocate memory ...
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