Reasons for MySQL Replication Lag
One common theme in the questions our MySQL Support customers ask is MySQL Replication Lag. The story is typically along the lines everything is same as before and for some unknown reason the slave is...
View ArticleEventual Consistency in MySQL
We’re told that foreign key constraints are the best way to enforce logical referential integrity (RI) in SQL, preventing rows from becoming orphaned. But then we learn that the enforcement of foreign...
View ArticleMySQL opening .frm even when table is in table definition cache
or… “the case of Stewart recognizing parameters to the read() system call in strace output”.Last week, a colleague asked a question:I have an instance of MySQL with 100 tables and the...
View ArticleIdentifying the load with the help of pt-query-digest and Percona Server
OverviewProfiling, analyzing and then fixing queries is likely the most oft-repeated part of a job of a DBA and one that keeps evolving, as new features are added to the application new queries pop up...
View ArticleThe relationship between Innodb Log checkpointing and dirty Buffer pool pages
This is a time-honored topic, and there’s no shortage of articles on the topic on this blog. I wanted to write a post trying to condense and clarify those posts, as it has taken me a while to really...
View ArticleIs Synchronous Replication right for your app?
I talk with lot of people who are really interested in Percona XtraDB Cluster (PXC) and mostly they are interested in PXC as a high-availability solution. But, what they tend not to think too much...
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Implementing SchemaSpy in your MySQL environment
Lately I have been working with a set of customers on a longer term basis which has given me time to explore new tools using their environments. One tool that I am finding very helpful is called...
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Using the new spatial functions in MySQL 5.6 for geo-enabled applications
Geo-enabled (or location enabled) applications are very common nowadays and many of them use MySQL. The common tasks for such applications are:Find all points of interests (i.e. coffee shops) around...
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Innodb redo log archiving
Percona Server 5.6.11-60.3 introduces a new “log archiving” feature. Percona XtraBackup 2.1.5 supports “apply archived logs.” What does it mean and how it can be used?Percona products propose three...
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MySQL performance implications of InnoDB isolation modes
Over the past few months I’ve written a couple of posts about dangerous debt of InnoDB Transactional History and about the fact MVCC can be the cause of severe MySQL performance issues. In this post I...
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