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Questions tagged [pessimistic-locking]

Pessimistic locking is a strategy that will lock a database record, that is to be updated, for exclusive use until the update is complete.

Pessimistic locking is a strategy that will lock a database record, that is to be updated, for exclusive use until the update is complete. The database record is locked immediately when the lock is requested and it is then guaranteed that the database record will be updated. Unlike optimistic locking, great care must be taken in the application design to avoid deadlocks.

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How Pessimistic lock works in database,does Isolation level has to do any thing with it?

I was reading about database locking(pessimistic,optimistic) mechanism, session 1: t1: open transaction: t2: sleep(3 sec) t5: updte user set name='x' where id =1 session 2: t2:update user set name='y' where id=1 my doubts are: 1. What will happen…
Nishat
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Optimistic and pessimistic locking in Node/Postgres?

I'm planning to use Node for my next project, because it seems to be a good fit for the problem I'm solving. One thing I need to figure out is optimistic and pessimistic locking.…
randomguy
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does with_lock lock everything inside the block?

Does with_lock lock all models in the block or just the model itself? For example in the following are all the item models inside with_lock locked or is just the entry model locked? class Entry < ApplicationRecord enum state: [:pending, :posted] …
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How does Hibernate do row version check for Optimistic Locking before committing the transaction

When before committing the current transaction hibernate checks the version of the row, it should issue an sql select statement for fetching ithe row. Assume that after issuing that select statement hibernate finds out that the row version is not…
Suren Aznauryan
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sql rowlock on select statement

I have an ASP.Net webpage where the user selects a row for editing. I want to use the row lock on that row and once the user finishes the editing and updates another user can edit that row i.e. How can I use rowlock so that only one user can edit a…
David
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JPA merge() best practice

I implemented a service for entity object and it uses pure jpa, I used spring, so in spring xml config configured hibernate as a jpa impl. I am using spring data for crud operations. But in our system our entity object is being pulled/updated many…
Elbek
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How to handle concurrent transactions from multiple pods in kubernetes

We are accessing shared database from multiple pods in kubernetes. All the pods may writes/updates and reads from the db. How to handle data integrity in this case ? Is JPA isolation levels are enough for handling this or need to go with pessimistic…
LearningBuddy
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Spring Pessimistic locking

i have spring project under java, using hibernate query, i like to use pessimistic locking. How to do Pessimistic locking in Spring + Hibernate? Edit: @Loggable(value = LogLevel.TRACE) @Transactional @Override public void updateBalance(String id,…
user597987
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How to disable locking at all from spring data jpa application

In my project due to my business requirement a lot of tables are continuously updated. Isolation level I have set Read Uncommitted in my MYSQL database but sometimes I get this exception at different different place in the…
Harish Bagora
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LockMode.PESSIMISTIC_WRITE behave different in Hibernate as SELECT FOR UPDATE in native queries

How does Hibernate handle LockMode.PESSIMISTIC_WRITE? Does it handle it in the same way as SELECT FOR UPDATE in native queries? I run 2 experimental transactions (T1 and T2) that execute the same native SQL that selects an entity using SELECT FOR…
ka3ak
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What is a real world example where you would choose to use pessimistic locking?

I have read many articles on when to use Optimistic vs. Pessimistic locking and my basic understanding is : Optimistic locking is more scalable so probably use this if possible Use pessimistic locking when it does not ever make sense to allow…
lmo523
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PHP/MySQL/jQuery Pessimistic Locking of Record

I've been thinking about developing some simple record locking for an application I'm involved in. There are a few users who will take literally hours to complete an edit of a record. This causes issues when someone else wants to make a change to…
jjwdesign
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How do I lock records in Rails 3 for a specific amount of time?

What I want to do is basically have a user obtain the lock on a record and have it for a specific amount of time so they can make changes to it, like wikipedia. So lets say a wikipedia article gives the user an hour to edit it before other users may…
Ben Scheib
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rails pessimistic lock not working

I´m trying to use a pessimistic lock in my app but it just not work... I´m using rails 3 (3.0.9), with activerecord-oracle_enhanced-adapter (1.3.2) and the lock option is now working for me... :( The app just dont use se "for update" clause in the…
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Hibernate JPA - PESSIMISTIC_WRITE, read the locked record

I was reading this article https://www.baeldung.com/jpa-pessimistic-locking, where it's written that PESSIMISTIC_WRITE – allows us to obtain an exclusive lock and prevent the data from being read, updated, or deleted So I tried to confirm this. In…
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