File tree 1 file changed +5
-2
lines changed
1 file changed +5
-2
lines changed Original file line number Diff line number Diff line change @@ -2146,8 +2146,11 @@ include_dir 'conf.d'
2146
2146
There is a separate server
2147
2147
process called the <firstterm>background writer</firstterm>, whose function
2148
2148
is to issue writes of <quote>dirty</quote> (new or modified) shared
2149
- buffers. It writes shared buffers so server processes handling
2150
- user queries seldom or never need to wait for a write to occur.
2149
+ buffers. When the number of clean shared buffers appears to be
2150
+ insufficient, the background writer writes some dirty buffers to the
2151
+ file system and marks them as clean. This reduces the likelihood
2152
+ that server processes handling user queries will be unable to find
2153
+ clean buffers and have to write dirty buffers themselves.
2151
2154
However, the background writer does cause a net overall
2152
2155
increase in I/O load, because while a repeatedly-dirtied page might
2153
2156
otherwise be written only once per checkpoint interval, the
You can’t perform that action at this time.
0 commit comments