On Tue, Nov 27, 2018 at 07:18:39PM -0500, Tom Lane wrote: > * When wal_compression is enabled and a "hole" is removed from a full > * page image, the page image is compressed using PGLZ compression. > > (BTW, is this trying to say that we don't apply compression if the page > contains no hole? If so, why not?)
Compression can be applied on a page with or without a hole. What this sentence means is that the equivalent of a double level of compression can be applied on top of the hole being removed, if the hole can be removed. -- Michael
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