I have a server 2008 with 24gb of RAM. On it, there are 5 separate instances; some SQL2008 and some SQL2012.
In my Oracle databases that are in Windows environment, I normally reserve 30% (about 7gb) of RAM for OS. So this is what I'm doing as well for this server.
I allocated 10% of the remaining (about 1.5gb) to the max server memory to each of the default instance, instance 2, 3 and 4.
I allocated 50% of the remaining RAM (11gb++) to the max server memory to instance1 because it has a numerous databases and one particularly huge database (> 5tb) and about 10-15k rows inserted daily.
Question 1: Is that how you allocate RAM? Based on database size and activity?
Question 2: I have a user reporting that when she has bulk insert (1000++ rows) from an 3rd party application; the application hangs and nothing will get inserted. Her database (DBXYZ) is in instance 4. Could this be related to amount or RAMs allocated to instance 4?
Question 3: I was reading http://www.sqlskills.com/blogs/paul/how-to-examine-io-subsystem-latencies-from-within-sql-server/ and executed the 2nd query. The read/write latency forDBXYZ are 111 and 571 respectively. Is that too high?
Question 4: The article mentioned "read and write hot spots are and then drill into a database to see what’s going on, and if nothing out of the ordinary" - what am I suppose to drill on the database and what's out of the ordinary?
Thanks
Ami