Hi, AFAIK ASM Background timer wait event is an idle wait event like PMON timer and SMON timer and is set when the ASMB background process is waiting on messages from the ASM instance. Regards, Fairlie Grant Allen <gxallen@xxxxxxxxx> wrote: A new consultant on site (and I) are curious about the "ASM Background Timer" wait, as it's being reported in the top 5 waits. I'm more interested in confirming if this is just an idle event used by ASM to indicate that it has nothing to do. The system (10gR2, Solaris 64-bit, EMC SAN, db of about 40GB) is running relatively well, but we're curious nonetheless. Nothing comes back from [technet | www | tahiti | docs].oracle.com, nor much from Google (just a few appendix listings classing it as an idle event). Anyone have any background on it? Ciao Fuzzy :-) -- http://www.freelists.org/webpage/oracle-l Fairlie Rego Senior Oracle Consultant http://www.linkedin.com/in/fairlierego http://el-caro.blogspot.com/ M: +61 402 792 405 --------------------------------- Sponsored Link Get an Online or Campus degree - Associate's, Bachelor's, or Master's - in less than one year.