RE: tirggers

Kevin,

In Oracle 8.1.6 you can have a database trigger as:

create database trigger <name> AFTER STARTUP (or something like that)

which fires when the database is opened. So you could fire off a procedure to pin objects, eg it's good for pinning things like sys.standard or other packages at startup.

Ian

-----Original Message-----
Sent: Monday, 9 April 2001 23:01
To: Multiple recipients of list ORACLE-L

That's basically what I am doing at this time. I was just curious whether or not there was a database trigger that could fire off once the instance was started. Thanks for all of the help and input people. Sincerely
Kevin

-----Original Message-----
Sent: Monday, April 09, 2001 6:10 AM
To: Multiple recipients of list ORACLE-L

That's right, Oracle seems to pull in all blocks needed to satisfy the query you send, which makes sense.. So if you do a select * from your_table; it should pull everything in to the buffer. One thing that you do have to consider, is that there is enough space in your KEEP buffer pool to store all of these tables..

Back to the root of your message though Kevin, could you not just write a script, that does a select * from your_tables, and execute this at start-up?

How large are these tables also, AFAIK the KEEP buffer pool should really be used for smaller, lookup or code tables..

HTH Mark

-----Original Message-----
Kostyszyn
Sent: Sunday, April 08, 2001 10:00
To: Multiple recipients of list ORACLE-L

If you fts the tables, won't Oracle just place them into the Keep pool because it will think that it needs them? ----- Original Message -----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Sent: Sunday, April 08, 2001 8:55 AM

> Alex,
>
> Further testing has proved that only the blocks needed to satisfy the
query
> are loaded, and not the entire table.
>
> I can post the details if you wish, but there's your answer:)
>
> Mark
>
> -----Original Message-----
> Alex
> Sent: Friday, April 06, 2001 06:27
> To: Multiple recipients of list ORACLE-L
>
>
> Looks like oracle reads into keep buffer pool only blocks that it needed
but
> then keep it there. Would be intersting to know if let say table has more
> then 1 block and access is using indexes - so oracle needs to read only 1
> block - will be all table loaded into keep buffer pool or only block
needed
> to satisfy query.
>
> Alex Hillman
>
> -----Original Message-----
> From: Mark Leith [SMTP:mark_at_cool-tools.co.uk]
> Sent: Friday, April 06, 2001 11:54 AM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: tirggers
>
> I thought that as well Tim, but wasn't sure whether Oracle loads the
> table
> at startup even if this is specified in the storage clause. The
> following
> test seems to show that it doesn't though:
>
> SQL> create table DUMMY_TABLE (id number(3), dummy varchar2(5))
> 2 storage(BUFFER_POOL KEEP);
>
> Table created.
>
> SQL> select DATA_OBJECT_ID, OBJECT_TYPE
> 2 from USER_OBJECTS
> 3 where OBJECT_NAME = 'DUMMY_TABLE';
>
> DATA_OBJECT_ID OBJECT_TYPE
> -------------- ------------------
> 26408 TABLE
>
> SQL> select count(*) buffers
> 2 from V$BH
> 3 where OBJD = 26408;
>
> BUFFERS
> ----------
> 1
>
> SQL> connect internal/password
> Connected.
> SQL> shutdown immediate;
> Database closed.
> Database dismounted.
> ORACLE instance shut down.
> SQL> startup
> ORACLE instance started.
>
> Total System Global Area 73701404 bytes
> Fixed Size 75804 bytes
> Variable Size 56770560 bytes
> Database Buffers 16777216 bytes
> Redo Buffers 77824 bytes
> Database mounted.
> Database opened.
> SQL> connect mark/password
>
> SQL> select count(*) buffers
> 2 from V$BH
> 3 where OBJD = 26408;
>
> BUFFERS
> ----------
> 0
>
> SQL> select * from DUMMY_TABLE;
>
> no rows selected
>
> SQL> select count(*) buffers
> 2 from V$BH
> 3 where OBJD = 26408;
>
> BUFFERS
> ----------
> 1
>
> Not sure on the trigger though, PL/SQL is not one of my strong
> points :)
>
> Mark
>
> -----Original Message-----
> Sawmiller
> Sent: Friday, April 06, 2001 02:07
> To: Multiple recipients of list ORACLE-L
>
>
> Why not just specify BUFFER POOL KEEP in an alter table statement?
>
> >>> Alex.Hillman_at_usmint.treas.gov 04/05/01 05:56PM >>>
> What is the problem to write something like
> Select * from <table_name> for all tables that you need or if there
> are too
> many such tables - create a new table with names of the tables and
> use
> dynamic SQL .
>
> Alex Hillman
>
> -----Original Message-----
> From: Kevin Kostyszyn [SMTP:kevin_at_dulcian.com]
> Sent: Thursday, April 05, 2001 5:28 PM
> To: Multiple recipients of list ORACLE-L
> Subject: tirggers
>
> Hi Intelligent DBA's
> I was wondering if anyone knows how to create a
> trigger that
> would fire off
> at database startup time and run a script to do full table
> scans on
> several
> tables to get them into the buffer cache keep pool? Right
> now I do
> it
> manually and would like to automate the task.
>
> Sincerely,
> Kevin Kostyszyn
> DBA
> Dulcian, Inc
> www.dulcian.com
> kevin_at_dulcian.com
>
> --
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>
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  INET: kevin_at_dulcian.com

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