May 2019
Intermediate to advanced
600 pages
20h 46m
English
book
PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
Content preview from PostgreSQL 11 Administration Cookbook
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How it works…
When the data checksum feature is enabled, each page header includes a 16-bit checksum of its contents and block number, which is updated when the page is flushed to disk.
If enabled, data checksums are verified every time a block is read from disk to shared buffers as well as when pg_basebackup is used to perform a backup.
Since the checksum is computed and added to the block when flushing to disk, a failure must be caused by a change inside the block that occurred while the block was not cached in the shared buffers; conversely, a change occurring while the block was buffered would be overwritten at the next flush.
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