February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Mind the version! PostgreSQL versions below 9.2 do not have the state or query fields and supply only the current_query column. While it might be tempting to use query and current_query interchangeably, older PostgreSQL versions are strictly at a disadvantage.
At the time of this edition, PostgreSQL versions older than 9.4 are no longer supported by the community. We've listed many fields in these older PostgreSQL versions, but if they are relevant to your installation, we strongly recommend upgrading.
Similarly, the way waits are displayed changed drastically in PostgreSQL 9.6. In older versions, the waiting column merely noted whether or not the query was blocked by some other process. The wait_event replacement makes it ...
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