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10 Newer Entries Showing entries 71 to 80 of 33365 10 Older Entries
How to close POODLE SSLv3 security flaw (CVE-2014-3566)
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Padding Oracle On Downgraded Legacy Encryption

First off, the naming “convention” as of late for security issues has been terrible. The newest vulnerability (CVE­-2014-3566) is nicknamed POODLE, which at least is an acronym and as per the header above has some meaning.

The summary of this issue is that it is much the same as the earlier B.E.A.S.T (Browser Exploit Against SSL TLS), however there’s no known mitigation method in this case – other than entirely

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And the Bose Mobile Speaker DrupalCon prize draw winner is...
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Wed, 2014-10-15 17:46robertsilen

DrupalCon Amsterdam was a great event with a lot of energy! It was good to hear so many Drupal developers have already made the switch to MariaDB including the Drupal Association!

We are happy to announce the winner of the free prize draw for the Bose SoundLink Mini:

Matthew Radcliffe at Kosada

Matthew has received his Bose SoundLink Mini and is very happy with the prize!

If you missed Maria-Luisa's talk on Wednesday about the benefits of deploying Drupal on MariaDB check out the slides on slideshare.

Want to know more about MariaDB and Drupal?

  • See our blog series on
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Updates with secondary index maintenance: 5.7 vs previous releases
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My previous results for an update-only workload to a cached and IO-bound database used a table that did not require secondary index maintenance from the update. Prior to that I ran tests using mysqlslap and might have found a regression in InnoDB when the update requires secondary index maintenance (bug 74235). The mysqlslap test did all updates to the same row. The test I describe here chooses the row to update at random and this workload does not reproduce the worst case from bug 74235.

The results are that newer releases tend to do

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Experimenting with the new Data Dictionary Labs Release
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Labs releases are intended to provide early access to new features. As Gopal notes in his recent blog post About the Data Dictionary Labs Release, there is a notable restriction where upgrading from any previous MySQL database version is not supported.

Today, I thought I would demonstrate how to get the data dictionary lab up and running on a fresh Ubuntu 14.04 installation:

# Download from labs.mysql.com
wget http://downloads.mysql.com/snapshots/pb/mysql-5.7.5-labs-dd/mysql-5.7.5-labs-dd-linux-el6-x86_64.tar.gz

# extract it to /usr/local/mysql
# more or less following instructions in INSTALL-BINARY

groupadd mysql
useradd -r -g mysql mysql
 
tar -xzf mysql-5.7.5-labs-dd-linux-el6-x86_64.tar.gz
mv
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Rackspace doubling-down on open-source databases, Percona Server
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Founded in 1998, Rackspace has evolved over the years to address the way customers are using data – and more specifically, databases. The San Antonio-based company is fueling the adoption of cloud computing among organizations large and small.

Today Rackspace is doubling down on open source database technologies. Why? Because that’s where the industry is heading, according to Sean Anderson, Manager of Data Services at Rackspace. The company, he said, created a separate business unit of 100+ employees focused solely on database workloads.

The key technologies under the hood include both relational databases (e.g., MySQL,

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Sysbench IO-bound updates: MySQL 5.7 vs previous releases
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I repeated the sysbench update-only test after reducing the InnoDB buffer pool to 1G. The test database is 16G so the test should be IO-bound. MySQL 5.7.5 is 10% worse than 5.0.85 at 1 thread and much better at 8+ threads.

The previous blog post has more details on the setup. The configuration is not crash safe as the doublewrite buffer and binlog are disabled and innodb_flush_log_at_trx_commit=2. This test continued to use direct IO for InnoDB but this test requires a high rate of reads from storage. The previous test did many writes but no reads. A fast flash device is used for storage.

results at 1-thread

Only 1 table is used so there is a 2G database and 1G buffer pool. This test is less IO-bound than the many threads tests reported in





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Recover orphaned InnoDB partition tablespaces in MySQL
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A few months back, Michael wrote about reconnecting orphaned *.ibd files using MySQL 5.6. I will show you the same procedure, this time for partitioned tables. An InnoDB partition is also a self-contained tablespace in itself so you can use the same method described in the previous post.

To begin with, I have an example table with a few orphaned partitions and we will reconnect each partition one by one to the original table.

mysql [localhost] {msandbox} (recovery) > SHOW CREATE TABLE t1 G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
[...]
KEY `h_date` (`h_date`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY RANGE (year(h_date))
(PARTITION p0 VALUES LESS THAN
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libAttachSQL 0.9.0 RC - Connection Groups
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It has been just over 4 months since I started working on libAttachSQL for HP's Advanced Technology Group. Today marks the first (and hopefully only) RC release of the library.

Connection Groups

The only real new feature that has been added to 0.9.0 is the concept of connection groups which is something I'm pretty excited about. Internally libAttachSQL uses event loops to supply the non-blocking API. Connection Groups join a bunch of connections together into a group that uses a single event loop. This makes things much more efficient internally and makes applications easier to code too.

Here is a simplified example of how to use it (for a more detailed example see our example in the documentation).

First we

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InnoDB General Tablespaces – Preview
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The new InnoDB Labs release contains the ability to create and use independent multi-table general tablespaces.

This feature will provide a way to group tables together into tablespaces at a location and filename of your choosing.  Tables using row formats of Redundant, Compact, and Dynamic can be combined together into the same general tablespace. Compressed tables with the same key_block_size can also be combined together.

The SQL syntax for creating an empty general tablespaces is:

CREATE TABLESPACE `tblspace_name` ADD DATAFILE 'tablespace.ibd' [FILE_BLOCK_SIZE=n];

The filename can contain an


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Sysbench cached updates: MySQL 5.7 vs previous releases
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I used MySQL 5.7.5 to repeat tests I did for MySQL 5.7.2 and 5.6.10 with the sysbench client and a cached database to compare performance for low and high concurrency. My configuration was optimized for throughput rather than crash safety. The performance summary:
  • MySQL 5.7.5 is 1.47X slower than 5.0.85 at 1 thread
  • MySQL 5.7.5 is a bit slower than 5.6.21 at 8 and 16 threads
  • MySQL 5.7.5 is faster than others at 32 threads
setup

I used my sysbench 0.4 fork and set the value of the c column to 0 in the sbtest tables as that column is incremented during the test. The


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10 Newer Entries Showing entries 71 to 80 of 33365 10 Older Entries

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