So, recently we had a runaway query eat up all sorts of temporary table space on our machines. Several machines had several terabytes in their ibtmp1 file after this happened. So I set out to find out more about why the InnoDB temporary tablespace is used, why it is better than using regular files, which was what was used prior to MySQL 5.7, and how to make sure that runaway queries do not end up filling up disk space.

Unfortunately, the manual does not go into why ibtmp1 is better than one file per temporary query, which disappears once the query ends. There are a few sections to look into:

Temporary Table Undo Logs – has one paragraph that states that these are the undo logs for temporary tablespaces. Given that these are undo logs, my guess is that this makes MySQL more crash-safe. But that is just a …

Monyog MySQL Monitor v8.3.0 is a feature-rich release which adds a large number of user requests for quick access to relevant monitoring information, for ‘cross-plotting’ multiple servers in a unified chart and more.  Additionally, it adds a number of non-critical bug fixes.

Changes as compared to Monyog MySQL Monitor v8.2.0 include: Features:

Added option to set a distinct email distribution list for warning alerts and critical alerts. Trend Graph Analysis: Added option to group a single metric (which one you find most important) from different servers into one unified chart. This allows you to visually analyse a metric across servers at various points in time.

Choose the monitor group >> Click on the trend graph icon next to the metric as shown below.

Select the trend graph corresponding to the required metric

Monitor single metric across …

Percona announces the release of Percona XtraDB Cluster 5.7.19-29.22-3 on October 27, 2017. Binaries are available from the downloads section or our software repositories.

NOTE: You can also run Docker containers from the images in the Docker Hub repository.

Percona XtraDB Cluster 5.7.19-29.22-3 is now the current release, based on the following:

• …

Percona announces the release of Percona XtraDB Cluster 5.6.37-26.21-3 on October 27, 2017. Binaries are available from the downloads section or our software repositories.

Percona XtraDB Cluster 5.6.37-26.21-3 is now the current release, based on the following:

• Percona Server for MySQL 5.6.37-82.2
• Galera Replication library 3.21
• wsrep API version 26

All Percona software is open-source and free.

…

Codership is pleased to announce a new release of Galera Cluster for MySQL consisting of MySQL-wsrep 5.5.58, 5.6.38, 5.7.20 and new Galera 3.22 library, wsrep API version 25.

NEW FEATURES AND NOTABLE FIXES IN THE GALERA REPLICATION LIBRARY SINCE LAST BINARY RELEASE BY CODERSHIP (3.21):

New features and notable fixes in Galera replication since last binary release

* Reporting last committed write set fixed to respect commit ordering (MW-341)

* GComm socket level error handling improved to avoid backend thread exit
in case of unexpected input from ASIO IO service (GAL-518)

* Race condition fixed in GComm message sending codepath (GAL-520)

* Fix for EVS protocol stall due to exhausted send window setting. This
bug could stall cluster messaging until the next keepalive was sent by
some node, causing …

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

This week was exciting from a Percona exposure standpoint. We were at Open Source Summit Europe. I gave two talks and participated in a panel, as the co-located event for the Open Source Entrepreneur Network happened on the last day as well. We had a booth, and it was great to hang out and talk with my colleagues Dorothée Wuest and Dimitri Vanoverbeke as well as all the attendees that popped by.

Releases

• …

Notes/errata/updates for Chapter 8:
See the official book errata at http://tahaghoghi.com/LearningMySQL/errata.php – Chapter 8 includes pages 277 – 296.

Note: if trying to load the “academics.csv” file on Linux, you may want to set the owner and group to mysql first:
sudo chown mysql:mysql /tmp/academics.csv

In the section on “Creating Tables with Queries”, p. 286, it says “The LIKE syntax allows you to create a new table with exactly the same structure as another, including keys.” However, it only preserves UNIQUE, PRIMARY and regular indexes. It does not preserve FOREIGN keys.

In the section on “Replacing Data”, p 292 – 293, it mentions the REPLACE command, but not the INSERT…ON DUPLICATE KEY UPDATE syntax. You can read about that at the …

MySQL 8.0.3 release candidate is out with amazing new replication features, along with changes in couple of replication default options. Thanks to our users for their constant feedback and valuable inputs, MySQL is changing defaults whenever possible to remove configuration overhead for practical deployment of MySQL server.…

MySQL is not only a relational database, but can also be used as a schemaless/NOSQL document store, or a mix of both. This is realized by the JSON datatype, and is useful for any data that is hard to fit in the ”tabular” format of a traditional table.…

In MySQL 8.0, we have now a new way of storing tables definitions: the Data Dictionary  !

Thanks to the Data Dictionary, DDLs in MySQL 8.0 are now Atomic. This means tat we have some changes in the behavior of the following DDLs for engines supporting  atomic DDL:

1. DROP TABLES <tables> – All tables will be dropped, or none are dropped
2. DROP SCHEMA – All entities in the schema will be dropped, or none are dropped
3. DROP VIEW – All views are dropped, or none are dropped
4. CREATE USER – All users are created, or none are created
5. DROP USER – All users are dropped, or none are dropped
6. GRANT – All users/roles in list are granted privileges, or none

This was detailed in …