2 - Write-Back scheme. This is a combination of previous two
schemes. All changes are made to memory and database
synchronization is done in the timer. The timer deletes all
expired contacts and flushes all modified or new contacts to
database. Use this scheme if you encounter high-load peaks and
want them to process as fast as possible. The mode will not help
at all if the load is high all the time. Also, latency of this
mode is much lower than latency of mode 1, but slightly higher
than latency of mode 0.
source ->
http://kamailio.org/docs/modules/4.1.x/modules/usrloc.html#usrloc.p.db_mode
--
Rainer Piper
Integration engineer
Koeslinstr. 56
53123 BONN
GERMANY
Phone: +49 228 97167161
P2P:
sip:7000@sip.soho-piper.de:5072 (pjsip-test)