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Displaying posts with tag: synchronization (reset)
MySQL replication in action - Part 4 - star and hybrid topologies

Previous episodes:

MySQL replication in action - Part 1: GTID & CoMySQL replication in action - Part 2 - Fan-in topologyMySQL replication in action - Part 3 - All-masters P2P topology
Introducing star topology.In all-masters P2P topologies, we have seen that we have a way of deploying a topology where all nodes are masters, and achieve better efficiency and stability than ring topologies. That …

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How does the Replication Synchronization Checker Work?

We recently introduced 'mysqlrplsync' in MySQL Utilities release-1.4.2 RC. This new utility allows users to check the data consistency of an active replication system. In this blog we provide more details about how 'mysqlrplsync' works.

In an active replication topology, slaves may be slightly behind the master in processing events. Depending on the workload and capabilities of each slave, transactions may be applied at different times. Should this occur and something untoward happen to one of the slaves (such as a user making a manual change directly on the slave), a synchronization process may be required to ensure that the slaves have the same data - to manually catch up all of the slaves that are behind the master.

The strategy we choose was to build on the top of the replication process and makes use of GTIDs; it works independently of the binary log format (row, statement, or mixed) and does not create any new data …

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New MySQL Utility: Replication Synchronization Checker

We are very happy to introduce an new MySQL utility called 'mysqlrplsync' that can check the data consistency of an active replication system. This utility is one of the new utilities included in MySQL Utilities release-1.4.2 RC. The other utility is the multi-source replication utility, mysqlrplms.

In a nutshell, the mysqlrplsync utility allows you to check the data consistency between servers in an active replication system. The utility reports missing databases and tables as well as data differences (per table) between the servers. A sophisticated synchronization algorithm that utilizes a table checksum is applied on the active replication servers to locate differences in the data.

Main FeaturesBesides permitting the data consistency check of an active replication system, here are the main features of the mysqlrplsync utility:

  • Allows the comparison of a specific set of servers, providing …
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Compare and Synchronize Databases with MySQL Utilities

The mysqldiff and mysqldbcompare utilities were designed to produce a difference report for objects and in the case of mysqldbcompare the data. Thus, you can compare two databases and produce a report of the differences in both object definitions and data rows. 

While that may be very useful, would it not be much more useful to have the ability to produce SQL commands to transform databases? Wait no longer! The latest release of MySQL Utilities has added the ability to generate SQL transformation statements by both the mysqldiff and mysqldbcompare utilities. 

To generate SQL transformations in either utility, simply use the --sql option to tell the utility to produce the statements.

Object Transformations with mysqldiff

If you would like to compare the schema of two databases (the objects and their definitions), mysqldiff can do that for you and produce a difference report …

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MySQL schema maintenance

At CodeBits I had my first session about MySQL schema maintenance. I covered the basic command line possibilities before coming to the recommended tool, MySQL Workbench.
The slides are available at slideshare.

Interesting questions: ([updated] with answers from the development team

  • [Q] Are there plans to administer MySQL Cluster with Workbench?
    [A] Not that we know of.
  • [Q] Can Workbench deal with user permission maintenance across servers? (especially in cases where development and production users can't have …
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Maatkit version 1674 released

This release contains bug fixes and new features. Click through to the full article for the details. I'll also write more about the changes in a separate article.

What is new in Maatkit

My posts lately have been mostly progress reports and release notices. That's because we're in the home stretch on the book, and I don't have much spare time. However, a lot has also been changing with Maatkit, and I wanted to take some time to write about it properly.

Maatkit version 1579 released

This release contains bug fixes and new features. The biggest new feature, in my opinion, is a new sync algorithm for mk-table-sync. Now you can sync any table with an index more efficiently than previously. This is the return of the speed I promised earlier. (Though I haven't yet benchmarked it; I am very short on time these days. Your benchmarks and other contributions are welcome).

I'm finally feeling like the table sync tool is getting in good shape!

Changelog etc is in the full article.

Maatkit version 1417 released

Download Maatkit

Thanks again to all the great sponsors for my week of work on the kit!

This is the long-awaited "Baron worked on table sync" release. Hooray!

Please read the full blog post for important (very important!) information.

Progress on Maatkit bounty, part 3

This is the last day I'm taking off work to hack on mk-table-sync, and I thought it was time for (yet another) progress report. Here's what I have done so far. (Click through to the full article to read the details).

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