MySQL Statement Digests are a feature originally introduced as part of the MySQL Performance Schema in MySQL 5.6 to aggregate statement statistics based on the normalized statements executed within the server (for additional info, see here).

Digest calculations are done based on the tokens found in the statement text. The length to which these tokens were considered for the digest calculation was previously fixed at 1024 bytes. Which meant that while reading the tokens, once 1024 bytes were read from statement’s token stream, only that many tokens were considered when generating the …

Percona Toolkit is one of our most mature open source applications. Derived from Maatkit and Aspersa, Percona Toolkit has evolved significantly over the years. The software now contains 32 tools, over 4,000 tests, and has been downloaded over 250,000 times. Anyone who manages a database – from DBAs to system administrators to even software developers – benefits from Percona Toolkit’s ability to perform a variety of MySQL server and system tasks that are too difficult or complex to perform manually.

We continue to make Percona Toolkit better each month. Over the last 9 months alone Percona has had 6 releases and resolved nearly 50 issues.

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My former boss, Marten Mickos, has created an excellent new resources for early stage founders, managers and execs called www.Schoolofherring.com. Each post has a short write up and often a 2-3 minute video covering a topic such as giving feedback, Peter Drucker's principles of good management, what it takes to build an effective team, hiring for strength etc. Some of these topics are very practical, like how to send good email, others are more thought-provoking, such as the notion that …

The setup_actors table in MySQL Performance Schema can be used to specify what users and hosts one wants to have instrumentation enabled for. By default, connections from all users and hosts are instrumented:

mysql> select * from performance_schema.setup_actors;
+------+------+------+
| HOST | USER | ROLE |
+------+------+------+
| %    | %    | %    |
+------+------+------+
1 row in set (0.00 sec)

You can then use standard SQL against this setup_actors table in order to specify what users and hosts you want to have instrumentation enabled for.

But what about the case where you want to enable instrumentation for everyone except the …

In developing MySQL Server and MySQL Cluster we use four types of testing.
We use unit testing, we use functional testing, we use system testing and
we use benchmark testing.

For the unit tests and functional tests we use the MTR test framework. This
is dealing with most issues of how to use SQL to query the MySQL database
engine.

For system testing the InnoDB team has a test framework that is used to ensure
that InnoDB will survive crashes of many sorts. In a similar fashion MySQL
Cluster uses the autotest framework that I described in an earlier blog:
Link to earlier blog.

For benchmark testing we have a few frameworks, I am going to describe the one
that I use on a regular basis. This framework can be downloaded from:
…

The performance of a Galera cluster is strongly connected to the performance of MySQL. Galera only supports the InnoDB storage engine, it is therefore important to have an insight into how InnoDB operates – what metrics we can rely on and what kind of issues we might face. In this blog post, we will give you a tour of some of the InnoDB internals. Note that we covered Galera monitoring and host/OS monitoring in previous blogs.

For starters, we’d like to emphasize this is by no means comprehensive guide. Some details will not be mentioned here …

Introduction

MySQL Enterprise Backup 3.12.0 (MEB) introduces a new feature for restoring an InnoDB table from a backup. Now it is possible to rename the table during restore. This is useful when the user wants to restore a table from a backup without overwriting the existing version of the table in the database.

The following example illustrates how the renaming feature could be used.  Suppose that the DBA has deleted three rows from a table T1 by mistake and he now wishes to get them back from a backup. He wants to leave the database online and to restore the 3 deleted rows from a TTS backup (a backup created with the --use-tts option) that contains the table T1.  He can do this with this feature in three steps:

1. He restores with MEB the table T1 from a TTS backup renaming it to T2.
   
   
2. He uses MySQL client to issue SQL statements to …

Your commands use "--backup-image=-" without redirecting standard output (on backup) or input (on restore), so in ordinary Unix/Linux convention the backup image would be written to (read from) your screen.
I strongly doubt this will work at all, you better specify a true file name.
If, however, "mysqlbackup" does not assign the meaning "standard output / input" to the name '-', you have silently shown what I consider a bug.

Explaining and providing solutions of MySQL error 1449: The user specified as a definer does not exist using SQL SECURITY INVOKER and DEFINER.

The post How to fix definer does not exist error 1449 MySQL first appeared on Change Is Inevitable.

This webinar provides a better understanding of how MySQL and its storage engines use indexes, as well as how you can improve performance with basic and advanced index optimizations.

The slide deck from the webinar is embedded below, and you can also register for a recording here.