How much Memory should be allocated to SQL Server 2005

Hi,
I have a SQL Server 2005 installation on a server having 64GBof RAM.
SQL server is allocated 57GB of the available RAM.
Could you please tell me what would be the ideal RAM allocation for my scenario. is the one that is set now, fine.
How much RAM should be left for the OS and other processes to run?
I have around 8 databases on the server and the cumulative size of all the databases in about 800GB, these are highly used servers, used for a public domain.

Umesh,
Saeid and Uri has already given you good articles to refer to please read them. Reg SQL Server utilization I am sure you are referring to task manager which is always not correct place to look for memory utilization. Below link has query which will give
you SQL Server memory utilization
http://blogs.msdn.com/b/sqlsakthi/archive/2011/02/28/t-sql-script-to-monitor-memory-usage-by-sql-server-instance.aspx
Article provided by Uri will give you not absolute value but almost correct value, but since you asked absolute value you need to look at performance counter to reach at correct memory utilization. If you refer to section 'Does my SQL server has low memory'
in article which Saeid gave you will find list of counters to monitor for memory utilization use the counters to reah absolute value.
>>OK, Can high RAM utilization by sql server cause the OS to restart by any chance.
IMO its not possible I have never seen SQL server being cause for OS shutdown. SQL Server works in non preemptive mode and will yield memory to OS when required. One possibility is when SQL server has locked pages in memory(LPIM) and some rouge process
or driver starts using memory from OS heavily and since SQL server memory is locked( due to LPIM privilege) it cannot trim heavily resulting in OS to terminate but this is not because of SQL server but because of bad drivers and processes leaking
memory on OS.
SQL server using memory is normal behavior
>>This question seems vague, but I had to ask this, because my server restarts abruptly and I don't get valid reasons in the Logs for that matter.
Does SQL server starts abruptly or windows OS ? Please look at event viewer for more details and SQL server logs. Is your SQL Server 2005 patched to SP4
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it.
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