We're getting numerous deadlocks in a multi-user system where users are coming in and updating their own data.
In our troubleshooting/traces, the deadlocks seem to be coming from lock contention on a Primary Key Clustered Index, not on the table itself.
Also, from what we can see, the application is requesting multiple locks on the Primary Key Index as it proceeds to perform the update on the primary table.
Can anybody shed some light on this?
The output from the sp_lock procedure below shows multiple page-level
locks being acquired on the Primary Key Index during a Row update,
(all by the same SPID). Although the output below doesn't show any
WAIT status locks, usually we encounter several, and subsequently
have deadlocks. In addition, usually the lock mode being requested
is IX - for intent exclusive, just before a final 'X' mode lock being acquired -
presumably to update the index?
I'm not sure I understand why the index would even need updating?
spid dbid ObjId IndId Type Resource Mode Status
------ ------ ----------- ------ ---- ---------------- -------- ------
51 7 0 0 DB S GRANT
52 7 0 0 DB S GRANT
52 7 0 0 DB S GRANT
52 7 0 0 DB S GRANT
52 7 0 0 DB S GRANT
52 7 0 0 DB S GRANT
52 7 397244470 1 PAG 1:462530 IX GRANT
52 7 397244470 0 TAB IX GRANT
52 7 397244470 3 KEY (5600524a83f4) X GRANT
52 7 397244470 4 KEY (e7007b1049f1) X GRANT
52 7 397244470 1 PAG 1:460575 IX GRANT
52 7 397244470 1 PAG 1:104507 IX GRANT
52 7 397244470 1 PAG 1:93918 S GRANT
52 7 397244470 1 PAG 1:93919 S GRANT
52 7 397244470 1 PAG 1:93920 S GRANT
52 7 397244470 1 PAG 1:93921 S GRANT
52 7 397244470 1 PAG 1:93922 S GRANT
52 7 397244470 1 PAG 1:93923 S GRANT
52 7 397244470 1 PAG 1:93924 S GRANT
52 7 397244470 1 PAG 1:93925 S GRANT
52 7 397244470 1 PAG 1:93926 S GRANT
52 7 397244470 1 PAG 1:93927 S GRANT
52 7 397244470 1 PAG 1:93936 S GRANT
52 7 397244470 1 PAG 1:93937 S GRANT
52 7 397244470 1 PAG 1:93938 S GRANT
52 7 397244470 1 PAG 1:93939 S GRANT
52 7 397244470 1 PAG 1:93940 S GRANT
52 7 397244470 1 PAG 1:93941 S GRANT
52 7 397244470 1 PAG 1:93942 S GRANT
52 7 397244470 1 PAG 1:93943 S GRANT
52 7 397244470 1 PAG 1:93944 S GRANT
52 7 397244470 1 PAG 1:93945 S GRANT
52 7 397244470 1 PAG 1:93946 S GRANT
52 7 397244470 1 PAG 1:93947 S GRANT
52 7 397244470 1 PAG 1:93948 S GRANT
52 7 397244470 1 PAG 1:93949 S GRANT
52 7 397244470 1 PAG 1:93950 S GRANT
52 7 397244470 1 PAG 1:93951 S GRANT
52 7 397244470 1 PAG 1:93952 S GRANT
52 7 397244470 1 KEY (2b00467cf4a5) X GRANT
53 4 0 0 DB S GRANT
54 7 66099276 0 TAB Sch-S GRANT
54 7 0 0 DB S GRANT
54 7 0 0 DB S GRANT
54 7 0 0 DB S GRANT
54 7 0 0 DB S GRANT
54 7 0 0 DB S GRANT
55 1 85575343 0 TAB IS GRANT
55 7 0 0 DB S GRANT
57 7 0 0 DB S GRANT
58 4 0 0 DB S GRANT
59 7 0 0 DB S GRANT
62 7 0 0 DB S GRANT
78 7 0 0 DB S GRANT
We can provide more detailed traces and code as needed.
- Peter C
0 1796 Sign in to post your reply or Sign up for a free account.
Similar topics |
by: Edward |
last post by:
SQL Server 2000 Enterprise Edition
Access 2000 Front End
One of our clients has recently been experiencing problems with an app
that has run satisfactorily (though slowly) for some time. To
overcome the slowness, they have installed a new server with SQL
Server 2000 Enterprise Edition with 'Log Shipping' enabled (to provide
a subsidiary database on which reports can be run) but although the
speed issue is resolved, there are hitherto...
|
by: David Berman |
last post by:
I'm having a problem with an update operation in a stored procedure. It
runs so slowly that it is unusable, unless I comment a part out in which
case it is very fast. However, I need the whole thing :). I have a
table of email addresses of people who want to get invited to parties.
Each row contains information like email address, city, state, country,
and preferences for what types of events are of interest.
The primary key is an...
|
by: M Wells |
last post by:
Hi All,
I have a database that is serving a web site with reasonably high
traffiic.
We're getting errors at certain points where processes are being
locked. In particular, one of our people has suggested that an update
statement contained within a stored procedure that uses a where
condition that only touches on a column that has a clustered primary
index on it will still cause a table lock.
|
by: Philip Boonzaaier |
last post by:
I want to be able to generate SQL statements that will go through a list of
data, effectively row by row, enquire on the database if this exists in the
selected table- If it exists, then the colums must be UPDATED, if not, they
must be INSERTED.
Logically then, I would like to SELECT * FROM <TABLE>
WHERE ....<Values entered here>, and then IF FOUND
UPDATE <TABLE> SET .... <Values entered here> ELSE
INSERT INTO <TABLE> VALUES <Values...
|
by: robert |
last post by:
i need to update a column which is a member of the PK on this
table. there are some thousands of rows to be updated, many more
thousand already in the table.
so, i get a constraint violation doing a simple
set col1 = 'x' where col1 = 'y'
attempted (in general terms; col1 & col2 are the PK)
| |
by: Steve B. |
last post by:
Does anyone know why the DA Update() would throw an exception?
I moved the database but I updated the Conn and the DA, currently
(trying)removing/replacing DS. Is there a another direction I should be
looking in? Does it matter if I move columns in the grid (everything is a
string anyways)? Does the DS need to be udated from the DT?
***************
int rowNo = dg.CurrentRowIndex;
dt = dt .Rows.BeginEdit();
|
by: Grant McLean |
last post by:
Hi
First a simple question ...
I have a table "access_log" that has foreign keys "app_id" and
"app_user_id" that reference the "application_type" and "app_user"
tables. When I insert into "access_log", the referential integrity
triggers generate these queries:
SELECT 1 FROM ONLY "public"."application_type" x
|
by: Mark Harrison |
last post by:
So I have some data that I want to put into a table. If the
row already exists (as defined by the primary key), I would
like to update the row. Otherwise, I would like to insert
the row.
I've been doing something like
delete from foo where name = 'xx';
insert into foo values('xx',1,2,...);
|
by: jbutler8192 |
last post by:
Hello.
We have a multi-user Java application that can connect to either a
UniVerse database or a DB2 database on an AS400 through JDBC. The
program executes a SELECT ... FOR UPDATE statement. When connected to
the UniVerse database, if a second user runs the program, at the point
where the selection executes, the program waits on the lock until the
first user's updates are committed. However, when connected to the DB2
database, in the...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| |
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| |
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
| |