Transaction on FromDual GmbH

Keep your Galera Cluster up and running by all means

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 26 Feb 2021 12:15:14 +0000

We see quite often customers complaining that their Galera Cluster is not stable and “crashes” from time to time. As always one has to investigate before rating.

MariaDB Prepared Statements, Transactions and Multi-Row Inserts

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 15 Apr 2019 18:09:34 +0000

Last week at the MariaDB/MySQL Developer Training we had one participant asking some tricky questions I did not know the answer by heart.

InnoDB Log File size is too small

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 16 Jul 2015 20:15:36 +0000

The InnoDB Log File (innodb_log_file_size) size is possibly too small.
Choosing a too small InnoDB Log File size can have significant write performance impacts.

InnoDB Flush Log at Transaction Commit

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 16 Jul 2015 20:11:36 +0000

InnoDB Flush Log at Transaction Commit is set to a values != 1. This can lead to a loss of committed transactions in case of a power failure or an unclean shutdown of your database.

MySQL Query Cache does not work with Complex Queries in Transactions

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 29 Jun 2011 13:28:27 +0000

We did recently a review of one of our customers systems and we found that the Query Cache was disabled even thought it had significant more read than write queries.
When we asked the customer why he has not enabled the Query Cache he mentioned a review that was done a few years ago and which stated that the Query Cache hit ratio was non optimal.
This was verified on a testing system which had the Query Cache enabled by accident.

Transactional memory resident tables with PBXT

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 21 Nov 2010 21:32:18 +0000

Introduction

In his presentation about PBXT at the DOAG Conference 2010 Paul McCullagh was speaking about memory resident PBXT tables. They will be available in version 1.1 of the PBXT Storage Engine Plugin. Memory resident PBXT tables should have similar characteristics like normal MySQL MEMORY</span> tables</a>. But in addition to the MEMORY tables they are transactional and can handle BLOB</span> and TEXT attributes.

Transaction performance

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 12 Mar 2007 12:06:00 +0000

Transaction performance relates among other things from I/O performance. This means hard disk performance.

What is the quickest way to load data into the database?

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 11 Feb 2026 10:04:00 +0100

We had some really exciting problems to solve for the last customer! Especially because the database wasn’t exactly small.