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10 Newer Entries Showing entries 121 to 130 of 1150 10 Older Entries

Displaying posts with tag: Databases (reset)

The Curious Case of the Missing Binlogs
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When you enable binlogs in the my.cnf file you can either set the log-bin flag to true, or you can set it to a path and file name prefix such as this:

[mysqld]
log-bin=/path/to/binlogs/mysql-binlog

This changes the default location where binlogs are stored.  The problem is that when you connect to mysql there is currently no way to query the server to find out if that path has been changed, and what it currently is.  This means you can't be sure where any server's binlogs are actually stored.
Ok, so they're not really missing, but it's a known issue that mysql doesn't make them easy to find. …



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Percona Repo Conflicts With Itself
+3 Vote Up -2Vote Down

On a RHEL 6.3 server, we are running MySQL 5.1 (not MariaDB, not the Percona patched version, plain old regular MySQL):

$ rpm -qa | egrep -i "percona|maria|mysql" | sort
mysql-5.1.61-4.el6.x86_64
mysql-libs-5.1.61-4.el6.x86_64
mysql-server-5.1.61-4.el6.x86_64
percona-toolkit-2.1.8-1.noarch
percona-xtrabackup-2.0.5-499.rhel6.x86_64
perl-DBD-MySQL-4.013-3.el6.x86_64
$

We went to do a system update today, and had a problem with dependencies, because the Percona repository wants to replace mysql-libs with Percona’s shared libraries. How rude!

# yum update …








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What OS do you use for MySQL?
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In looking at operating systems in use for last year I found a very high concentration of RedHat/CentOS 5, and Ubuntu LTS operating systems. I would like to get a better picture of what is really used for MySQL production systems.
Please take a moment to help me out. This survey only has one question.

Thanks

Poor programming practices
+3 Vote Up -2Vote Down

When will it stop. These amateur programmers that simply cut/paste code really affect those good programmers in the ecosystem trying to make a decent living. I was reviewing a developed (but incomplete) PHP/MySQL system using a common framework (which in itself is irrelevant for this post).

In one source file there were 12 repetitions of the following code:

   //permissions
    $this->security_model->setUserPermissions($id);
    if (!array_key_exists($id,$this->session->userdata['permissions']) OR
        !array_key_exists('id', $this->session->userdata['permissions'][$id]) OR
        !array_key_exists('scope', …
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IN Subqueries in MySQL 5.6 Are Optimized Away
+9 Vote Up -12Vote Down

In MySQL 5.6, it looks like IN() subqueries are optimized even better than they are in MariaDB 5.5. Here’s a typical IN() subquery, using the sakila sample database (query taken from slide 6 of the presentation about new MySQL 5.6 optimizer statistics):

SELECT title FROM film WHERE film_id IN (SELECT film_id FROM film_actor)

Before there were any subquery optimizations, say if you are using MySQL 5.1, you would have to rewrite this query as a JOIN, to avoid the dreaded DEPENDENT SUBQUERY that shows up in …

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Do we need a MySQL Cookbook?
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The blog title says it all: Do we need a MySQL Cookbook? I tend to think so.

This seems to be something that is missing with current MySQL documentation. There is lots of information available but finding the appropriate bit can be quite tedious and it often requires looking in multiple places.

A lot of other software has such books, but for some reason MySQL seems to be missing one.

A recent example comes from a “documentation feature request” I posted today: http://bugs.mysql.com/bug.php?id=68171. MySQL 5.6 provides a way to “move InnoDB tables” from one …

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New EXPLAIN Features in MySQL 5.6 – FORMAT=JSON actually adds more information!
+8 Vote Up -0Vote Down

When I heard that MySQL 5.6 was implementing EXPLAIN for writes (INSERT,UPDATE,DELETE,REPLACE), I was pretty excited. Then I heard that MySQL 5.6 also was implementing a JSON format for EXPLAIN and my thought was “I do not care about that!”

Boy, was I wrong. The JSON format does not just put the output into JSON format, it also gives extra information that’s actually pretty useful! It can tell you when you are doing an implicit cast, which parts of a composite index are being used, and when index condition pushdown are being used. None of these are shown in regular EXPLAIN (which seems odd, why could …

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Upgrading to MySQL 5.5 on Ubuntu 10.04 LTS
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Ubuntu does not provide an apt-get repository package for MySQL 5.5 on this older OS, however this is still a widely used long term support version. The following steps will upgrade an existing MySQL 5.1 apt-get version to a standard MySQL 5.5 binary.

Step 1. Remove existing MySQL 5.1 retaining data and configuration

sudo su -
service mysql stop
cp -r /etc/mysql /etc/mysql.51
cp -r /var/lib/mysql /var/lib/mysql.51
which mysqld
dpkg -P mysql-server mysql-server-5.1 mysql-server-core-5.1
which mysqld
which mysql
dpkg -P mysql-client-5.1 mysql-client-core-5.1
which mysql
dpkg -P libdbd-mysql-perl libmysqlclient16 mysql-common
# This …
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MySQL 5.1 vs. MySQL 5.5: Floats, Doubles, and Scientific Notation
+8 Vote Up -0Vote Down

For the past few days, I have been upgrading a few servers. We are going from Percona’s patched MySQL 5.1 to MariaDB 5.5 (the subquery optimization is excellent, and we have lots of subqueries). Our process involves upgrading a slave first, and letting it replicate for a while, and if everything’s good, update more slaves, then the master.

This has served us well in the past. And now that we are checking data integrity between masters and slaves with pt-table-checksum, the process involves checking before we start that …

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On MySQL Memory Usage and Configuration
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I saw a post on profiling memory usage today and this reminds me of several discussions I have had with different people.

Why would you want to profile the memory usage? Usually to see where memory is allocated and for what purposes, and usually you only care when memory usage is higher than expected. That is a DBA normally wants to use all available memory on a server for mysqld, whatever that size may be.

Configuration parameters may be inappropriate and need adjusting, so having a way to …

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10 Newer Entries Showing entries 121 to 130 of 1150 10 Older Entries

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