Re: Pinning Tables

From: Marin Dimitrov <marin_at_sirma.bg>
Date: Tue, 06 Feb 2001 03:51:26 -0800
Message-ID: <F001.002ABC6C.20010206031025@fatcity.com>

• Original Message ----- To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Monday, February 05, 2001 17:36

> Hi all,
> I have been trying to find some reference on pinning tables in the SGA. I
> haven't found anything, all that I am finding is table caching and the
keep
> buffer pool. Is this all that there is, can I "pin" a table in the
memory?
> Thanks in advance.

try ALTER TABLE xxx STORAGE(BUFFER_POOL KEEP);

when the table blocks are first accessed they should go to the KEEP buffer and if it is big enough they should never be flushed out (take a look at the BUFFER_POOL_KEEP init.ora parameter).

several people mentioned ALTER TABLE xxx CACHE; but this is different from "pinning" because it will just instruct the server to place the table blocks on the "most recently used" end of the buffer pool (instead on the "least recently used" one) if full table scan is performed and sooner or later they would probably be flushed out.

hth,

    Marin

---

"When someone is seeking, it happens quite easily that he only sees the thing that he is seeking; that he is unable to find anything, unable to absorb anything, because he is only thinking of the thing he is seeking, because he is obsessed with his goal. Seeking means: to have a goal; but finding means: to be free, to be receptive, to have no goal. ..."

                                Herman Hesse, "Siddhartha"

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-- 
Author: Marin Dimitrov
  INET: marin_at_sirma.bg

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Received on Tue Feb 06 2001 - 05:51:26 CST