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10 Newer Entries Showing entries 91 to 100 of 34198 10 Older Entries
Enabling Global Transaction Identifiers Without Downtime in MySQL 5.7.6
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A much requested feature has made it to MySQL 5.7.6: Global Transaction Identifiers (GTIDs) can now be enabled online, without stopping writes, synchronizing servers, or restarting servers.

We introduced GTIDs in MySQL 5.6.6. GTIDs allow, among other things, seamless fail-over after a master has crashed. This enables highly available applications, since service can continue without interruption even if the master crashes. For new deployments, you could easily enable GTIDs right away – just set gtid-mode=ON in the configuration files. For deployments that accept a certain amount of downtime, you could switch from off to on too. However, …

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More Awesome Replication Features in MySQL 5.7.6
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More Awesome Replication Features in 5.7.6

It is time to celebrate again. The latest MySQL server development milestone (MySQL 5.7.6) was just released, and let me tell you, it is full of great replication enhancements. These new improvements cover many areas, ranging from performance to flexibility and easier deployment. Let me highlight some of them, and give you a brief summary of what they are.

Multi-source Replication

A MySQL 5.7.6 slave/server can now connect to multiple MySQL masters.

After a long development …

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Heads up! MySQL 5.7 DMR6 contains a (small) known bug
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MySQL 5.7 DMR6 was been released today! By my crude measurement, it is a big release with a number of new features and bug fixes:

morgo@Rbook:~$ for V in 1 2 3 4 5 6; do curl --silent http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-$V.html | wc -l; done;
2543
4914 <-- DMR2
2282
2940
4118
4121 <-- DMR6

The release notes have one important known bug to note:










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MySQL Utilities Makes Skipping Transactions on Multiple Servers Easy
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We are very happy to introduce a new MySQL utility named "mysqlslavetrx", which allows users to easily skip multiple transactions on multiple servers in a single step. This utility is one of three new utilities included in MySQL Utilities release-1.6.1 Alpha. The other utilities are "mysqlbinlogpurge" and "mysqlbinlogrotate", which can be used to purge and rotate binary logs.

The mysqlslavetrx utility allows you to skip multiple transactions on several slaves. More precisely, it injects empty transactions for the specified Global Transaction Identifier (GTID) set and list of target slaves. Skipping transactions can be …

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MySQL Utilities Makes Skipping Transactions on Multiple Servers Easy
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We are very happy to introduce a new MySQL utility named “mysqlslavetrx“, which allows users to easily skip multiple transactions on multiple servers in a single step. This utility is one of three new utilities included in MySQL Utilities release-1.6.1 Alpha. The other utilities are “mysqlbinlogpurge” and “mysqlbinlogrotate“, which can be used to purge and rotate binary logs.

The mysqlslavetrx utility allows you to skip multiple transactions on several slaves. More precisely, it injects empty transactions for the specified Global Transaction Identifier …

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Advanced JSON for MySQL
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What is JSON

JSON is an text based, human readable format for transmitting data between systems, for serializing objects and for storing document store data for documents that have different attributes/schema for each document. Popular document store databases use JSON (and the related BSON) for storing and transmitting data.

Problems with JSON in MySQL

It is difficult to inter-operate between MySQL and MongoDB (or other document databases) because JSON has traditionally been very difficult to work with. Up until recently, JSON …

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LCP Pausing module in MySQL Cluster 7.4
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A new feature that assists in making node restart much faster is
the new PAUSE LCP protocol. This is an excerpt from the MySQL
Cluster 7.4 source code. There is also a fair amount of new
comments in the 7.4 source code which are only valid in the code
context.

This module contains code that executes for the purpose of pausing
LCP reporting to our meta data for a short time while we are copying the
meta data to a new starting node.

In order to better understand the handling of the LCP protocol we will
describe the LCP protocol, this includes both the old and the …










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MySQL Performance Schema : setup_actors ENABLED column
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performance_schema.setup_actors is a table in MySQL Performance schema which could be used to specify what users/hosts one wants to have instrumentation on for. By default connection from all users and hosts are enabled to be instrumented for. Here is the default configuration :

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

It is easy to see that one can set for what user/host he/she …









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MySQL 5.7.6 is out. Be prepared for big changes
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Today Oracle released MySQL 5.7.6 milestone 16. With this, MySQL 5.7 has been in development for over 2 years.
Compared to MySQL 5.6, the changes are quite extensive. The main effort of the team has been focused on speed, with performance reportedly improved from 2 to 3 times compared to previous releases.
A full list of what is new would take too much space here, but I would like to mention some key points:


  • Oracle has …





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The MySQL 5.7.6 Milestone Release is Available
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The MySQL Development team is happy to announce our 5.7.6 development milestone release (DMR), now available for download at dev.mysql.com! The source code is available at GitHub. You can find the full list of changes and bug fixes in the 5.7.6 release notes. Here are the highlights. Enjoy!

InnoDB

Refactoring needed for general tablespace (CREATE TABLESPACE) support

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10 Newer Entries Showing entries 91 to 100 of 34198 10 Older Entries

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