One can influence the locking of data via the "lock table" command and "for
update of" portions of a SQL cursor. As a general rule of thumb I totally
discourage anyone from ever using the lock table command. Certainly the process
within the server is complicated as needs be, but it is one of the best I've
seen in terms of concurrency and consistency. If your having a problem with
clients being able to access data that is locked by another client then the
problem is either in their application and/or their use of the application.
I've seen problems where a user updated a number of records in SQL*Plus and then
decided to go to lunch while the statement completed. A second user then tried
to update a different column in a number of the same records only to get "locked
out". The answer was to have a few words with the first users manager, who BTW
was the second user's manager as well. From then on this individual never left
a statement just to run by itself & the problem has not re-occurred. In general
locking issues are VERY infrequently a server side problem though that is where
it is implemented. Instead they are almost always a client side issue. Also,
there is no way that I can think of for a client to manage their locks without
involving the server.
Dick Goulet
____________________Reply Separator____________________
Author: [EMAIL PROTECTED]
Date: 6/29/2001 2:01 AM
Hi,
To find out more about the locking mechanism you can try the oracle
concepts manual
Jack
Helen rwulfjeq
<lannyue@yahoo To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
.com> cc: (bcc: Jack van
Zanen/nlzanen1/External/MEY/NL)
Sent by: Subject: Re: What's lock/unlock
mechnism
[EMAIL PROTECTED]
om
28-06-2001
21:40
Please respond
to ORACLE-L
Thank you very much for your response. But how oracle design let server to
handle locks. There are lots of overheads because lots of clients can
access server at a same time. If client handles individually, They will
release lots of overburden for server. And server just make sure that only
owner of lock can unlock CS. Anywhere we can find those information.
Thanks.
HL
[EMAIL PROTECTED] wrote:
Hi,
All locking is handled by the server, not client
Jack
Helen rwulfjeq
.com> cc: (bcc: Jack van Zanen/nlzanen1/External/MEY/NL)
Sent by: Subject: What's lock/unlock mechnism
[EMAIL PROTECTED]
om
28-06-2001
00:09
Please respond
to ORACLE-L
Hi ,
Oracle database system uses very complicated lock/unlock design for
readlock,writelock and row/recordlock etc..... Does anyone know
lock/unlock
is implemented both client like sqlplus and server side or just on server
side or just client side. For instance, one user using sqlplus access
database to update one record of table XX. So should be sqlplus's
responsibility to lock this record based on row level of XX table? or
serve! ! ! r is also involved in? Thanks.
H.
Do You Yahoo!?
Get personalized email addresses from Yahoo! Mail - only $35 a year!
http://personal.mail.yahoo.com/
=====================================================================
De informatie verzonden in dit e-mailbericht is vertrouwelijk en is
uitsluitend bestemd voor de geadresseerde. Openbaarmaking,
vermenigvuldiging, verspreiding en/of verstrekking van deze informatie aan
derden is, behoudens voorafgaande schriftelijke toestemming van Ernst &
Young, niet toegestaan. Ernst & Young staat niet in voor de juiste en
volledige overbrenging van de inhoud van een verzonden e-mailbericht, noch
voor tijdige ontvangst daarvan. Ernst & Young kan niet garanderen dat een
verzonden e-mailbericht vrij is van virussen, noch dat e-mailberichten
worden overgebracht zonder inbreuk of tussenkomst van onbevoegde derden.
Indien bovenstaand e-mail! ! ! bericht niet aan u is gericht, verzoeken
wij u
vriendelijk doch dringend het e-mailbericht te retourneren aan de
verzender
en het origineel en eventuele kopieën te verwijderen en te vernietigen.
Ernst & Young hanteert bij de uitoefening van haar werkzaamheden algemene
voorwaarden, waarin een beperking van aansprakelijkheid is opgenomen. De
algemene voorwaarden worden u op verzoek kosteloos toegezonden.
=====================================================================
The information contained in this communication is confidential and is
intended solely for the use of the individual or entity to whom it is
addressed. You should not copy, disclose or distribute this communication
without the authority of Ernst & Young. Ernst & Young is neither liable
for
the proper and complete transmission of the information contained in this
communication nor for any delay in its receipt. Ernst & Young does not
guarantee that the i! ! ! ntegrity of this communication has been
maintained nor
that the communication is free of viruses, interceptions or interference.
If you are not the intended recipient of this communication please return
the communication to the sender and delete and destroy all copies.
In carrying out its engagements, Ernst & Young applies general terms and
conditions, which contain a clause that limits its liability. A copy of
these terms and conditions is available on request free of charge.
=====================================================================
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author:
INET: [EMAIL PROTECTED]
Fat City Nettwork 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 messa! ! ! ge
to: [EMAIL PROTECTED] (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).
Do You Yahoo!?
Get personalized email addresses from Yahoo! Mail - only $35 a year!
http://personal.mail.yahoo.com/
=====================================================================
De informatie verzonden in dit e-mailbericht is vertrouwelijk en is
uitsluitend bestemd voor de geadresseerde. Openbaarmaking,
vermenigvuldiging, verspreiding en/of verstrekking van deze informatie aan
derden is, behoudens voorafgaande schriftelijke toestemming van Ernst &
Young, niet toegestaan. Ernst & Young staat niet in voor de juiste en
volledige overbrenging van de inhoud van een verzonden e-mailbericht, noch
voor tijdige ontvangst daarvan. Ernst & Young kan niet garanderen dat een
verzonden e-mailbericht vrij is van virussen, noch dat e-mailberichten
worden overgebracht zonder inbreuk of tussenkomst van onbevoegde derden.
Indien bovenstaand e-mailbericht niet aan u is gericht, verzoeken wij u
vriendelijk doch dringend het e-mailbericht te retourneren aan de verzender
en het origineel en eventuele kopieën te verwijderen en te vernietigen.
Ernst & Young hanteert bij de uitoefening van haar werkzaamheden algemene
voorwaarden, waarin een beperking van aansprakelijkheid is opgenomen. De
algemene voorwaarden worden u op verzoek kosteloos toegezonden.
=====================================================================
The information contained in this communication is confidential and is
intended solely for the use of the individual or entity to whom it is
addressed. You should not copy, disclose or distribute this communication
without the authority of Ernst & Young. Ernst & Young is neither liable for
the proper and complete transmission of the information contained in this
communication nor for any delay in its receipt. Ernst & Young does not
guarantee that the integrity of this communication has been maintained nor
that the communication is free of viruses, interceptions or interference.
If you are not the intended recipient of this communication please return
the communication to the sender and delete and destroy all copies.
In carrying out its engagements, Ernst & Young applies general terms and
conditions, which contain a clause that limits its liability. A copy of
these terms and conditions is available on request free of charge.
=====================================================================
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author:
INET: [EMAIL PROTECTED]
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: [EMAIL PROTECTED] (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:
INET: [EMAIL PROTECTED]
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: [EMAIL PROTECTED] (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).
