| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> RE: tirggers
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
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Kevin Kostyszyn
INET: kevin_at_dulcian.com
Fat City Network Services -- (858) 538-5051 FAX: (858)
538-5051
San Diego, California -- Public Internet access /
Mailing
Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail
message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru')
and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).
You may
also send the HELP command for other information (like
subscribing).
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Hillman, Alex
INET: Alex.Hillman_at_usmint.treas.gov
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing
Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Tim Sawmiller
INET: sawmillert_at_state.mi.us
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing
Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Mark Leith
INET: mark_at_cool-tools.co.uk
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing
Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Hillman, Alex INET: Alex.Hillman_at_usmint.treas.gov Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mark Leith INET: mark_at_cool-tools.co.uk Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Sun Apr 08 2001 - 07:31:51 CDT
 |
 |