Re: max_wal_size

David,

> For 0.5 you get 2/3rds consumption: ( n / ( 1 + 0.5  ) ) = n * 2/3

Exactly, for checkpoint_completion_target=0.5 the distance between 
checkpoints is 2/3 of max_wal_size.

But back to the documentation of max_wal_size.
"Maximum size to let the WAL grow to between automatic WAL checkpoints."

For me it looks like the distance between checkpoints is equal to 
max_wal_size.

English is not my native language, so I admit that I misunderstand the 
exact meaning of this phrase.

P.S. Sorry to post this topic twice.
https://www.postgresql.org/message-id/97af9ef7-d7d9-cfd0-a280-d400cf05c68a%40postgrespro.ru
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Pavel Luzanov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company