On 01.12.2010 13:27, aaliya zarrin wrote:
I want to know how frequently postgres search for trigger file to switch
In 9.0, every 100ms while streaming replication is active and connected.
5 seconds otherwise. In current git master branch, it's always 5 s.
Can this switch over time be reduced?
Not without hacking the sources and compiling.
Although, on many platforms, Linux included I believe, sending a signal
to the startup process should wake it up from the sleep and make it
check the trigger file immediately. "pg_ctl reload" for example should
do it. So if ýou send a signal to the startup process immediately after
creating the trigger file, it should take notice sooner.
Plz let me know where postgres poll for trigger file. I could find it out in
"backend/access/trans/xlog.c" ? am i right?
Yes. search for callers of CheckForStandbyTrigger() function.