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Hibernate: Deadlock found when trying to obtain lock


Hibernate: Deadlock found when trying to obtain lock

By : Leon Ehrhardt
Date : November 22 2020, 12:01 PM
Does that help Because the deadlocks happen so frequently, it looks like some of the threads of the application are holding locks for an extended period of time.
Each thread in the application will use it's own database connection/connections while accessing the database, so from the point of view of the database two threads are two distinct clients that compete for database locks.
code :
   <!-- spring entity manager and transactions -->
<logger name="org.springframework.orm.jpa" additivity ="false">
    <level value="debug" />
    <appender-ref ref="ConsoleAppender" />
</logger >
<logger name="org.springframework.transaction" additivity ="false">
    <level value="debug" />
    <appender-ref ref="ConsoleAppender" />
</logger >


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MySQL: Deadlock found when trying to get lock

MySQL: Deadlock found when trying to get lock


By : Soon
Date : March 29 2020, 07:55 AM
will help you 1) Yes, a query(SELECT/INSERT/UPDATE/DELETE) can lock the database.
For Example: SELECT Query
code :
SELECT * FROM CUSTOMER 

//Making use of nolock as below will avoid deadlock but there are chances that you may not get the recent records just insert in your DB.

SELECT * FROM (nolock)CUSTOMER 
Mysql: Deadlock found when trying to get lock, need remove key?

Mysql: Deadlock found when trying to get lock, need remove key?


By : neol732
Date : March 29 2020, 07:55 AM
this will help When dealing with deadlocks, the first thing to do, always, is to see whether you have complex transactions deadlocking against eachother. This is the normal case. I assume based on your question that the update statement, however, is in its own transaction and therefore there are no complex interdependencies among writes from a logical database perspective.
Certain multi-threaded databases (including MySQL) can have single statements deadlock against themselves due to write dependencies within threads on the same query. MySQL is not alone here btw. MS SQL Server has been known to have similar problems in some cases and workloads. The problem (as you seem to grasp) is that a thread updating an index can deadlock against another thread that updates an index (and remember, InnoDB tables are indexes with leaf-nodes containing the row data).
Lock obtain timed out error : NativeFSLock@C:\lucene\indexes\com.srccodes.example.hibernate.Contact\write.lock

Lock obtain timed out error : NativeFSLock@C:\lucene\indexes\com.srccodes.example.hibernate.Contact\write.lock


By : Samdanae
Date : March 29 2020, 07:55 AM
should help you out I have a requirement to integrate elastic search Engine for SQLite database. So, am using Hibernate Search for the search engine integration. After i have a new record into the table am getting the error. , There are multiple problems.
Not closing the SessionFactory
MySQL - DBUpdateException ('Deadlock found when trying to get lock; try restarting transaction')

MySQL - DBUpdateException ('Deadlock found when trying to get lock; try restarting transaction')


By : Israel Osiris García
Date : March 29 2020, 07:55 AM
this will help The problem is you are not locking certain record. In mysql you can lock rows like this
code :
SELECT * FROM users WHERE name = 'name' FOR UPDATE;
using (var scope = new TransactionScope(TransactionScopeOption.RequireNew,
new TransactionOptions { 
    IsolationLevel = IsolationLevel.ReadUncommitted 
}))
{
  // your select and increment should go here  
}
spring hibernate obtain lock on the whole db

spring hibernate obtain lock on the whole db


By : Janiel
Date : March 29 2020, 07:55 AM
To fix this issue What people usually do for this is to REVOKE CONNECT ON DATABASE x FROM PUBLIC and then force other connections closed, or modify the pg_hba.conf file and reload the configuration to prevent the unwanted logins.
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