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z/VSE lock file placement
About 5 years ago I had a blog post bout this subject. Just yesterday our Level 2 service team got questions about the placement of the lock file. Therefore I repost the old blog entry with additional information. If you are running multiple z/VSE system,...
from Blog: z/VSE Blog
Modified on by Ingolf24
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z/VSE: Waiting for locked resource (X'8E')
Last Friday Jeff had a question about the z/VSE Lock Manager on VSE-L. The STATUS command showed "M0052 N5 TCS006R 8E WAITING FOR LOCKED RESOURCE USED BY N7". He wanted to know the resource name and got good tips from the VSE community....
from Blog: z/VSE Blog
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How to format the z/VSE lock file
If you want to synchronize a resource between (e.g. a VSAM file - share option 4) multiple z/VSE systems, you can use the z/VSE DASD sharing support. DASD Sharing requires a lock file, where all systems that participate in sharing are registered with their CPU...
from Blog: z/VSE Blog
Modified on by Ingolf24
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AIX: WHO IS LOCKING MY FILE?
File locking is an essential concept for insuring data integrity. It is quite common for programs to 'lock' files to make sure that what they read is accurate or to prevent anyone from reading or writing the file that they are modifying. Because...
from Blog: Thoughts from Support
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Why there are exclusive locks on system tables after changing value of INTRA_PARALLEL
The Problem: After changing INTRA_PARALLEL from YES to NO and restarting the server, execlusive locks are observed, like: lock_mode lock_type schema.table &nbs...
from Blog: Thoughts from Support
Modified on by oxufufei
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What to do in case the number of sharing CPUs are exceeded ?
This week is again a short one for me. We have a public holiday on Thursday and I will not be in the office on Friday. Some of us will have a long weekend too (Memorial Day weekend). This is my 701st blog entry Today I have a technical topic about z/VSE...
from Blog: z/VSE Blog
Modified on by Ingolf24
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OMEGAMON JVM monitoring for z/OS Locking Data Community Blog
pkeargle
Tags:
zos
performance
omegamon
management
enhanced_3270ui
mainframe
jvm
lock
10,944 Views
Locking is one of the most important aspects in Java application programming. When applications are multi-threaded, they must protect data from concurrent updates. Locking protects the...
from Blog: System z Management
Modified on by pkeargle
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Using OMEGAMON to Diagnose Slow JVMs Through Thread Data Community Blog
bgrusky
Tags:
performance
thread
mainframe
jvm
management
enhanced_3270ui
omegamon
zos
lock
1 Comment
12,584 Views
Java is one of the most well-known and used programming languages today, which makes Java Virtual Machines (JVMs) integral in today’s application programming. When working with a JVM, you will undoubtedly encounter performance issues at some...
from Blog: System z Management
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z/VSE: What to do in case of a lock file error (message 0T01E) ?
Just last week we had 2 problems, where z/VSE users got message "0T01E ERROR ON LOCK FILE". As you may remember I discussed this issue in a blog entry in 2014. Because it's a rare situation, I decided to re-post that problem again. If you search...
from Blog: z/VSE Blog
Modified on by Ingolf24
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Solving EC3 timeout abends due to Mbean deadlocks
Chad McDowell
Tags:
was
deadlock
lock
timeout
websphere
ec3
timeouts
wait
server
websphere_application_ser...
application_server
mbean
1 Comment
11,243 Views
With an increasing amount of stack products being available and used with WebSphere Application Server on z/OS, we're starting to see EC3 timeouts of different varieties that are caused by Mbean long waits or deadlocks. An initial review of the dump...
Modified on by SteveWebb
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z/VSE: What to do in case of a lock file error ?
In z/VSE the lock file is used to share resources across multiple z/VSE systems. You define the lock file with the DLF command during IPL. In July I posted a block entry with more details about DASD sharing and the lock file. The block entry is here . Just a...
from Blog: z/VSE Blog
Modified on by Ingolf24
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Do you have multiple z/VSE systems ?
If you are running multiple z/VSE system, you may share data between those systems. z/VSE provides DASD sharing through a lock file for that purpose, which is provided by the lock manager in the Supervisor. That's my topic for today. The beginning of the...
from Blog: z/VSE Blog
Modified on by Ingolf24
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Transactional lock elision (TLE) can produce the effects of fine-grained locking and higher concurrency
KarenLawrence
Tags:
coarse-grained
lock
power8
elision
linux
tm
memory
power
parallel
htm
tle
ibm
fine-graned
aix
programming
optimize
transactional
18,268 Views
Transactional memory (TM) is a feature that was proposed some time ago in academia, but only recently has been implemented in modern, mainstream processors. TM is intended to simplify parallel programming, as an alternative to using locks. For example:...
from Blog: Power Systems IBM Redbooks
Modified on by ScottVetter
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Identifying locks from Updatable Secondary Serversfrom Blog: Informix Experts
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z/OS锁的那些事儿
适宜读者 ： （一年及以上主机经验） 背景知识： （z/OS基本操作，操作系统原理） 在z/OS的多任务多处理器环境中，资源会被多个应用使用，协调资源访问的技术叫做资源的串行化使用(Serializing user of resources)。而加锁技术是串行化使用资源时最常用技术之一。本文将全面介绍z/OS加锁技术的那些事儿。 提个醒儿，如果你已知道以下概念的话，你就可以忽略本文了！ 什么是全局锁，什么是局部锁 什么是旋转锁，什么是挂起锁...
from Blog: IBM System z 中国实验室
Modified on by IBM System z 中国实验室
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Removing CVS locks ( tag: [11:22:33] waiting for <ID>'s lock in <path> Community Blog
From time to time the CVS repositories (yeah right, 2013 and we still use CVS), will lock some files and not by a user. If this is the case let's follow this simple procedure: Error may look like this: cvs tag: [13:06:02] waiting for foo's lock...
from Blog: Systems administrator stuff
Modified on by Emerson Posadas
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What is purpose of the 'deadlock' mutex which can be seen in 'onstat -g spi' output?
The 'deadlock' mutex ensures
that there is never be more than one session checking for a deadlock situation
at any given time. Whenever some lock is requested due to the LOCK MODE set to
WAIT [seconds] statement used by a session, the code for deadlock...
from Blog: Informix Experts
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Recent presentation of “lock-chains and deadlocks in on shot”
On last Friday presented this very short ppt on the db2 2012 contest. Just rather simple query against monitoring views. when copying the PPT, the blue background lost and that's why it looks so ugly now:)
from Blog: Yonghang's DB2 Note
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Troubleshooting Optimistic Lock Exception in WebSphere Commerce
Optimistic Lock Exception is one of the issues that is commonly faced when developing and customizing WebSphere Commerce. Optimistic Lock Exception is not only specific to WebSphere Commerce however. Rather, it is about updating one entry concurrently at the...
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The inode I never knew
File contents and metadata When you change permissions on a file, the file contents aren't affected. The change is made to the i-node. So what's an inode? A quick visit to Wikipedia explains: "An inode stores all the information about a regular file , ...
from Blog: AIX Down Under
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Living without HealthCenter: lock analysis for Java 1.4.2
Chris Bailey - old
Tags:
java
lock
bottleneck
profiling
analysis
performance
healthcenter
monitor
12,824 Views
In the last entry we discussed how the TPROF utility that is part of the Performance Inspector package of tools can be used to carry out performance profiling where HealthCenter is not available. HealthCenter has a number of other capabilities, including: lock...
from Blog: IBM on troubleshooting Java applications
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