MySQL: Using SKIP LOCK For Queue Processing (no replies)
https://www.percona.com/blog/2020/08/03/using-skip-lock-for-queue-processing-in-mysql/
View ArticleMySQL: Foreign Key Constraints and Locking (no replies)
https://blog.koehntopp.info/2020/08/04/mysql-foreign-key-constraints-and-locking.html
View ArticleMySQL 8.0.21: New Consistency for Datafile Locations (no replies)
MySQL 8.0.21: New Consistency for Datafile Locations — https://mysqlserverteam.com/new-consistency-for-datafile-locations-in-mysql-8-0-21/
View ArticleMySQL 8.0.21: Improvements to InnoDB Undo Truncation (no replies)
MySQL 8.0.21: Improvements to InnoDB Undo Truncation — https://mysqlserverteam.com/improvements-to-undo-truncation-in-mysql-8-0-21/
View ArticleError message on OS freebsd (7 replies)
I am using InnoDB. The mysql is of the latest version for OS Freebsd12.1 The error complains about tablespace id being the same for two tables. How do I fix this? Someone on the internet said to move...
View ArticleMySQL 8.0.20+: insert speed drop (no replies)
Hi, After upgrading from MySQL 8.0.19 to 8.0.20 I noticed a significant speed drop with large inserts. For example inserting 1 million records takes twice as long now. Then I upgraded to 8.0.21 but it...
View ArticleMySQL Performance : Understanding InnoDB IO Internals &"Checkpointing" (no...
MySQL Performance : Understanding InnoDB IO Internals & "Checkpointing" - http://dimitrik.free.fr/blog/posts/mysql-80-innodb-checkpointing.html
View ArticleAUTO_INCREMENT when column maximum is reached (1 reply)
I think I'm not doing anything wrong, but I'm seeing what looks like a problem when an AUTO_INCREMENT column reaches its max, only when using the InnoDB engine (with MyISAM engine it behaves...
View ArticleMySQL: InnoDB Locking - Deep Dive (no replies)
https://mysqlserverteam.com/innodb-data-locking-part-1-introduction/
View ArticleMySQL Server 8.0.22 Missing sys folder database upgrade fails (2 replies)
Hi there, I am hoping that someone out there knows more than me about the InnoDB database upgrade procedure for MySQL and can help me. I don't know that much to be honest. I am running Ubuntu Server...
View ArticleSetting innodb_flush_method to O_DIRECT on Centos 7.8 (no replies)
I have read that you should set innodb_flush_method to O_DIRECT in MySQL to avoid double buffering. I have also read that you should not use tmpfs for the tmpdir, because that will disable AIO. While...
View Articleerror 1146 (5 replies)
i am using mysql control center everythign works but when i click on tables i get error 1146: TABLE " " DOES NOT EXIST.. please someone help
View Articledeadlock of gap lock upgrade to insert attention lock (no replies)
how can i insert a absolute new data in concurrent trx. my idea like this example: ##trx1 and trx2 begin; ##trx1 select max(id) from `test_lock` where (`aid` = 10) limit 1 for update; ##trx2(have...
View ArticleWhy is there a GB discrepancy between innodb_file_per_table=ON vs...
Hi just a little context. We had a database server that was configured with the default innodb_file_per_table=ON. It was unnoticed but as the server schemas grew to over 1000, Backups were really so...
View ArticleInnoDB Data Locking – Part 2.5 “Locks” (Deeper dive) (no replies)
InnoDB Data Locking – Part 2.5 “Locks” (Deeper dive) https://mysqlserverteam.com/innodb-data-locking-part-2-5-locks-deeper-dive/
View ArticleMysql8 clone plugin and innodb_file_per_table (no replies)
Is it possible to use the my SQL 8 clone plugin to fix an implementation error. Initially when the server was set up it Had innodb_file_per_table=On enabled. I would like to use the Clone plugin to...
View ArticleMySQL full text index doesn't show up in query plan when use with multiple...
explain select distinct o.id, o1.id, order_items.order_id from orders o left join orders o1 on MATCH(o1.po_number) AGAINST('+test*' IN BOOLEAN MODE) and o1.id=o.id left join order_items on...
View ArticleAdding new virtual column with instant algorithm (no replies)
Hi, I'm trying to add a generated column using the instant algorithm on an InnoDB table on MySQL 8.0.22 on Windows Server 2012. Whatever I try however it gives me the same error: "Error Code: 1846....
View ArticleThread 140699996440320 has waited at trx0rseg.ic line 50 for 946 seconds (3...
I'm seeing this repeatedly in my log: --Thread 140699996440320 has waited at trx0rseg.ic line 50 for 946 seconds the semaphore: X-lock on RW-latch at 0x7ff74ff50408 created in file buf0buf.cc line 778...
View ArticleTable Stuck and MYSQL Hang when run table optimize table (no replies)
Hello We have a table with almost 100000 records and have 36 fields in table When i run OPTIMIZE TABLE MYTABLE then process just going on and after few seconds mysql also hang. Even in WHM when i try...
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