Re: Caching a huge table's data in memory

As others have pointed out, the need to "cache a large table" should always be questioned carefully.

Having said that, your best bet is probably to create a KEEP pool (parameter db_buffer_pool_keep in 8.1, db_keep_cache_size in 9), and assign the table to the KEEP pool in its STORAGE declaration. If you do this, then I don't think you even need to define the table to be a CACHE table, but you might as well.

You will need to allocate enough buffers in the KEEP pool to hold the entire table, plus a little spare for current clones and CR copies if you expect the table to be subject to updates and concurrent query.

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html

-----Original Message-----
<Ranganath.Krishnaswamy_at_blr.hpsglobal.com> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: 07 January 2003 05:15

>Hi List,
>
> I have a requirement for caching the data of a huge table in memory.
>Is it just running the command Alter table <tablename> cache or
something
>else? What are the pros and cons of caching a table's data? Could
anybody
>advise me in this regard? Any help in this regard is very much
appreciated.
>
>Thanks and Regards,

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Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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