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10 Newer Entries Showing entries 31 to 40 of 105 10 Older Entries

Displaying posts with tag: 5.6 (reset)

MySQL 5.6 GA one year – What is next?
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MySQL 5.6 has been GA for just over a year now. See MySQL 5.6.10 Release Notes.  Congratulations on your birthday! That is quite a long time. I was using it earlier in production because it worked and could do things that 5.5 could not do, but earlier versions were to use at your own risk, and indeed if prodded incorrectly would fall on the floor. That is fair enough because they were work in progress, yet if you poked them the right way they did a very good job.  Those dev versions have been long since upgraded which is good so they do not need quite as much care …

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Single thread performance regression in 5.6 - Replication
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 At Facebook, we have upgraded most of MySQL database tiers to 5.6, except very few tiers that have a special requirement -- very fast single threaded replication speed.

 As Oli mentioned, single threaded performance is worse in 5.6. The regression is actually not visible in most cases. For remote clients, the performance regression is almost negligible because network latency is longer than 5.1->5.6 overhead. If clients are running locally but MySQL server is disk i/o bound, the overhead is negligible too because disk …

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MySQL RPMS and the new yum repository
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I was really pleased to see the announcement by Oracle MySQL yum repositories that they have now produced a yum repository from where the MySQL RPMs they provide can be downloaded. This makes keeping up to date much easier. Many companies setup internal yum repositories with the software they need as then updating servers is much easier and can be done with a simple command. For many people at home that means you set this up once and don’t need to check for updates and do manual downloads, but can do a quick yum update xxxx and you get the latest …

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How to recover an orphaned .ibd file with MySQL 5.6
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A few years ago Yves Trudeau and Aleksandr Kuzminsky wrote posts about different ways for recovering orphaned .ibd files:

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Persistent statistics and partitions
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Today when I was studying for the MySQL 5.6 exams.

I was studying for these two items:

  • Create and utilize table partitioning
  • Obtain MySQL metadata from INFORMATION_SCHEMA tables


The first step is to create a table, partition it with a hash.

mysql> CREATE TABLE pfoo (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255))
-> PARTITION BY HASH(id) PARTITIONS 4;
Query OK, 0 rows affected (0.04 sec)

mysql> INSERT INTO pfoo(name) VALUES('test01'),('test02'),('test03'),('test04'),
-> …









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Making full table scan 10x faster in InnoDB
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At MySQL Connect 2013, I talked about how we used MySQL 5.6 at Facebook, and explained some of new features we added to our Facebook MySQL 5.6 source tree. In this post, I'm going to talk about how we made full table scan faster in InnoDB.

Faster full table scan in InnoDB In general, almost all queries from applications are using indexes, and reading very few rows (0..1 on primary key lookups and 0..hundreds on range scans). But sometimes we run full table scans. Typical full table scan examples are logical backups (mysqldump) and online schema …

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New MySQL 5.6-Feature host_cache_size does not work
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Today as i was learning for the new MySQL 5.6-certification (more about that in a later post) i stumbled again across the host_cache-Table that was added to MySQL in 5.6.5. Before that you had no chance to check which hosts are already known by the MySQL-server.

So thats a pretty good feature for us. And even better: you could resize the size of the host_cache now! Whoohoo, awesome! As we have a lot of servers that need to connect to one of our MySQL-server and we could not switch to ip-based-authentication we were really happy to tune the host_cache-size without recompiling MySQL.

Unfortunately i noticed that the …

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New Shard-Query features checked into SVN
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I checked some updates to Shard-Query into SVN. Partitioning support has been extended for MySQL 5.6+ to ALL partitioning types.

This includes all previously unsupported types including RANGE LIST/COLUMNS partitioned tables that are partitioned over more than one column, and HASH/KEY/LINEAR variants as well. Shard-Query now exclusively uses the PARTITION hint for partition elimination instead of WHERE clauses in MySQL 5.6. For 5.5 and previous versions, support remains limited to LIST,RANGE, and LIST/RANGE COLUMNS over a single column.

The old mysql interface DAL has been replaced completely by the PDO DAL.

There is no major …

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Fun with Bugs #22 - Some Bug Reports You Should Not Miss
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Yet another user installed MySQL 5.5.32 yesterday and got a system that can not start... It's really easy to help in this case - just downgrade back to 5.5.31 or upgrade to 5.5.33 if you can. Why problem happened during upgrade? Because of a regression bug #69623.

This case that was easily solved during a quick chat reminded me about the problem of bugs in production. Nobody expects any sane DBA to review every new bug report, but some of them should not be missed, at least when upgrading to any newer version. Regression bugs (I see 15 …

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Fun with Bugs #21 - recently verified bugs in MySQL 5.6.13
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Notable contribution of MySQL Community to MySQL 5.6.13 was explicitly recognized recently. But users and contributors still continue their efforts, as well as Oracle engineers. Even though MySQL 5.6.13 has been generally available just for few days, we already have several new bug reports and updates to known bugs at http://bugs.mysql.com. Let me present a short list with some comments.



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10 Newer Entries Showing entries 31 to 40 of 105 10 Older Entries

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