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Displaying posts with tag: Percona (reset)
Fulfilled Tablespace Encryption (TDE) in Percona Cluster

Encryption is a very important form of security and It’s becoming a standard from a compliance perspective to ensure PCI, PII and HIPPA compliances. Encryption needs to be performed for Data at Rest, Data over Wire.

Data At Rest:

  • Until 5.6, To encrypt the MySQL data files, Only disk level encryption possible (Gazzang, Luks)
  • From 5.7.11 MySQL added a feature for tablespace encryption. Which encrypts only the …
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Fun with Bugs #67 - On Some Public Bugs Fixed in MySQL 8.0.11 GA

I stopped reviewing MySQL Release Notes for quite a some time, but major GA releases of MySQL do not happen often, so I decided to make an exception and write about some bugs from Community users fixed in MySQL 8.0.11 GA.

I'll start with good news about MySQL 8.0.11 GA! You can get sources at GitHub, and I had no problems to build on Fedora 27 on my good old QuadCore box, using the following cmake command line:
[openxs@fc23 mysql-server]$ cmake . -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_CONFIG=mysql_release -DFEATURE_SET=community -DWITH_EMBEDDED_SERVER=OFF -DDOWNLOAD_BOOST=1 -DWITH_BOOST=/home/openxs/boost …

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Fun with Bugs #65 - On MySQL Bug Reports I am Subscribed to, Part V

I think it's time to review some bugs I've subscribed to several months ago, those older than in the first post from this series. There are several really serious bugs in the list of 15 below:

  • Bug #87560 - "XA PREPARE log order error in replication and binlog recovery". This bug was reported by Wei Zhao, who also provided patches.
  • Bug #87526 - "The output of 'XA recover convert xid' is not useful". This bug reported by Sveta Smirnova is well known and is a real pain for DBAs who have to deal with incomplete XA transactions after some crash or unexpected restart. Check  …
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Ansible Best Practices

Managing Heterogeneous environment without automation can be tricky. We are using Ansible as an automation tool for install, configure and manage DB infra for Mydbops. Using Ansible, we overcome a lot of obstacle’s and we would like to share our learning with the community ( Our Presentation on Ansible )

 

Best Practices to write Ansible Plays

Use Native YAML Syntax

Ansible Tasks and Playbook are written in YAML. We can format YAML in different ways

  1. shorthand/one-line (=)
  2. structured map (:)
  3. folded scalars (>)

Shorthand/one-line (=)

e.g.:
- name: …
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Fun with Bugs #64 - On MySQL Bug Reports I am Subscribed to, Part IV

I've subscribed to more than 15 new MySQL bug reports since the previous post in this series, so it's time for a new one. I am trying to follow important, funny or hard to process bug reports every day. Here is the list of the most interesting recent ones starting from the latest (with several still not processed properly):

  • Bug #90211 - "Various warnings and errors when compiling MySQL 8 with Clang".  Roel Van de Paar and Percona in general continue their QA efforts in a hope to make MySQL 8 better. Current opinion of Oracle …
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Fun with Bugs #63 - On Bugs Detected by ASan

Among other things Geir Hoydalsvik stated in his nice post yesterday:
 "We’ve fixed a number of bugs detected by UBsan and Asan." This is indeed true, I already noted many related bugs fixed in recent MySQL 8.0.4. But I think that a couple of details are missing in the blog post. First of all, there still a notable number of bugs detected by ASan or noted in builds with ASan that remain "Verified". Second, who actually found and reported these bugs?

I decided to do a quick search and present my summary to clarify these details. Let me start with the list of "Verified" or "Open" bugs in public MySQL bugs database, starting from the oldest one:

  • Bug #69715 - "UBSAN: Item_func_mul::int_op() mishandles …
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Handling long duration SST(timeout) in PXC with systemd

In this blog post, We will be explaining about the timeouts in SST on systemd implementation which we faced recently in Percona XtraDB Cluster  during our Consulting with a client. State Snapshot Transfers (SST) refers to complete data sync from one of the nodes from the cluster to the joining node.

SST will happen for one or more reasons listed below.

  1. Initial sync to join a node to cluster.
  2. Node is out of cluster and lost its ability to join back due to data corruption or inconsistencies and also when the node went far behind the node, …
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Fun With Bugs #62 - On Bugs Related to JSON Support in MySQL

Comparing to "online ALTER" or FULLTEXT indexes in InnoDB, I am not that much exposed to using JSON in MySQL. OK, there is EXPLAIN ... FORMAT=JSON statement that is quite useful, optimizer trace in MySQL is also in JSON format, but otherwise I rarely have to even read this kind of data since my lame attempt to pass one introductory MongoDB training couse back in 2015 (when I mostly enjoyed mongo shell). Even less I care about storing JSON in MySQL.

But it …

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Online Schema Change for Tables with Triggers.

In this post, We will learn how to handle online schema change if the table has triggers.

In PXC, an alter can be made directly ( TOI ) on tables with less than a 1G ( by default) , but on a 20GB or 200GB table we need some downtime to do ( RSU ).

Pt-osc is a good choice for Percona Cluster/Galera. By default percona toolkit’s pt-online-schema-change will create After “insert / update / delete” triggers for maintaining the sync between the shadow and the original table.

pt-online-schema-change process flow:

Check out the complete slides for effective MySQL administration here

If the tables has triggers already then pt-osc wont work well in …

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On InnoDB's FULLTEXT Indexes

I had recently written about InnoDB features that I try to avoid by all means if not hate: "online" DDL and persistent optimizer statistics. Time to add one more to the list - FULLTEXT indexes.

This feature had a lot of problems when initially introduced in MySQL 5.6. There was a nice series of blog posts about the initial experience with it by my colleague from Percona (at that times) Ernie Souhrada: part I, …

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