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Is it advisable to clear buffer cache in Production? [message #400613]

Wed, 29 April 2009 02:14

nishantprabhakar
Messages: 28
Registered: April 2009
Location: UAE

Junior Member

Hi

Currently we are restarting the server daily once. else when the users start using the application for a long time (around 24 hours but not more than 36 hours) database is getting down.I think this problem is due to the lack of memory space.

In SAW(server administration work bench) we can see the usage as below.Used memory and Available memory will be changing in each second but I guess database is getting down when the available memory is less/not available.

Details from SAW:

Heap memory allocated by VM: 530,907,136 bytes
Heap used memory in VM: 444,449,624 bytes
Available (free) memory in VM: 86,457,512 bytes

Is there any problem in flushing the buffer cache in production? Will it help anyways?

or Do I need to reduce the PGA?

Please let me know how can I resize SGA and PGA accordingly with in 4GB RAM.

Total SGA : 500 Mb
PGA : 100 Mb
Total users : 175 (but around 100 or less than that will access the application same time)
Total RAM : 4 GB

Thanks

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Re: Is it advisable to clear buffer cache in Production? [message #400615 is a reply to message #400613]

Wed, 29 April 2009 02:19

babuknb
Messages: 1736
Registered: December 2005
Location: NJ

Senior Member

Quote:

database is getting down.I think this problem is due to the lack of memory space.

This is kind of issue; I recomment Don't use "I think " word.

1/ Check/Post alert log details.

2/ Check/Post your windows event viewer log.

3/ Then we can discuss with memory..

Babu

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Re: Is it advisable to clear buffer cache in Production? [message #400620 is a reply to message #400615]

Wed, 29 April 2009 02:29

ThomasG
Messages: 3211
Registered: April 2005
Location: Heilbronn, Germany

Senior Member

Is there any reason why you post basically the same problem over and over and over and over and over, instead of just looking in the alert log of the database what the actual problem is?

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Re: Is it advisable to clear buffer cache in Production? [message #400626 is a reply to message #400613]

Wed, 29 April 2009 02:40

Michel Cadot
Messages: 68665
Registered: March 2007
Location: Nanterre, France, http://...

Senior Member
Account Moderator

Quote:

Is it advisable to clear buffer cache in Production.

Never.

Regards
Michel

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