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Increase max_wal_size's default from 128MB to 1GB.

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The introduction of min_wal_size & max_wal_size in 88e9823026 makes it
feasible to increase the default upper bound in checkpoint
size. Previously raising the default would lead to a increased disk
footprint, even if more segments weren't beneficial.  The low default of
checkpoint size is one of common performance problem users have thus
increasing the default makes sense.  Setups where the increase in
maximum disk usage is a problem will very likely have to run with a
modified configuration anyway.

Discussion: 54F4EFB8.40202@agliodbs.com,
    CA+TgmoZEAgX5oMGJOHVj8L7XOkAe05Gnf45rP40m-K3FhZRVKg@mail.gmail.com

Author: Josh Berkus, after a discussion involving lots of people.
This commit is contained in:
Andres Freund
2015-03-15 17:37:07 +01:00
parent 241f088f36
commit a0f5954af1
5 changed files with 5 additions and 5 deletions
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2
src/backend/access/transam/xlog.c
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@ -79,7 +79,7 @@ extern uint32 bootstrap_data_checksum_version;
/* User-settable parameters */
int max_wal_size = 8; /* 128 MB */
int max_wal_size = 64; /* 1 GB */
int min_wal_size = 5; /* 80 MB */
int wal_keep_segments = 0;
int XLOGbuffers = -1;