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10 Newer Entries Showing entries 31 to 40 of 898 10 Older Entries

Displaying posts with tag: Uncategorized (reset)

The Latest and Greatest MySQL Replication Features in MySQL 5.7.5
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The latest and greatest MySQL 5.7 development milestone release (DMR) is out (changelog). It is great to see such a strong and steady cadence of development releases.  The latest one, 5.7.5, is packed with awesome features. Let me highlight a few ones related to replication.

Storing Global Transaction Identifiers History in a system table.

MySQL 5.7.5 introduces a new replication system table that is used by the server to save global transaction identifiers (GTIDs) execution history. This means …

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MySQL Security: Encrypting within MySQL. The new Enterprise Encryption plugin.
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Keeping things safe and within MySQL now:

http://mysqlchat.blogspot.co.uk/2014/09/enterprise-encryption-plugin.html


10 common replication problems
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Below are 10 common replication problems :

1)Session binlog :

Setting sql_log_bin = 0 will disable binary logging for the session. So any DML/DDL query executed within that session on the master will not be replicated to slave

Example:

Turn off binary logging on master :

mysql> set sql_log_bin = 0 ;
Query OK, 0 rows affected (0.00 sec)

Create table in reptest database ( on master )

mysql> create table reptest(ID int) ;
Query OK, 0 rows affected (0.01 sec)

mysql> show tables ;
+-------------------+
| Tables_in_reptest |
+-------------------+
| reptest           |
+-------------------+
1 …
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Using information_schema tables – Part 1
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Below are some of the common scenarios where information_schema is useful :

Tables table

How to check the database size using information_schema ?

SELECT table_schema "Data Base Name", SUM( data_length + index_length) / 1024 / 1024 
"Data Base Size in MB" FROM information_schema.TABLES GROUP BY table_schema ;

How to list the tables created before 4 days ?

 select * from information_schema.tables where CREATE_TIME < NOW() - INTERVAL 4 DAY ;

Columns table :

List all the tables that have a column called birth_date

select table_name from …
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Tracing down a problem, finding sloppy code
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Daniel was tracking down what appeared to be a networking problem….

  • server reported 113 (No route to host)
  • However, an strace did not reveal the networking stack ever returning that.
  • On the other side, IP packets were actually received.
  • When confronted with mysteries like this, I get suspicious – mainly of (fellow) programmers.
  • I suggested a grep through the source code, which revealed  return -EHOSTUNREACH;
  • Mystery solved, which allowed us to find what was actually going on.

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MySQL process list – Customized connection counts
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You got a production support call related to connection usage. Max_connections is set to 400 and  connection usage has reached the maximum limit.

Below are some of the customized reports that can be used to trace the problem

Count by host :

mysql> select count(*),host from information_schema.processlist group by HOST;
+----------+-----------+
| count(*) | host |
+----------+-----------+
| 1 | localhost |
+----------+-----------+
1 row in set (0.03 sec)


Count by database:

mysql> select count(*),host from information_schema.processlist group by DB; …
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MySQL Workbench 6.2.1 BETA has been released
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Dear MySQL Users,

The MySQL Workbench team is announcing availability of the first beta
release of its upcoming major product update, MySQL Workbench 6.2.

MySQL Workbench 6.2 focuses on support for innovations released in MySQL
5.6 and MySQL 5.7 DMR (Development Release) as well as MySQL Fabric 1.5,
with features such as:

* A new spatial data viewer, allowing graphical views of result sets
containing GEOMETRY data and taking advantage of the new GIS
capabilities in MySQL 5.7.
* Support for new MySQL 5.7.4 SQL syntax and configuration options.
* Metadata Locks View shows …






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Upgrade MySQL to a new version with a fresh installation & use shell scripts and mysqldump to reload your data
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There are several ways to upgrade MySQL. In this post, we will use a combination of shell scripts and the mysqldump application to export our MySQL data, and then re-import it back into the upgraded version of MySQL.

In this example, we will be doing a minor version upgrade. We will be going from 5.6.17 to 5.6.19. This method may not work if you …

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New! MySQL Utilities release-1.4.4 GA
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The MySQL Utilities Team is pleased to announce the latest GA release of MySQL Utilities, release-1.4.4. This release includes improvements in terms of usability, stability, security and an overall improvement regarding the comprehensibility of the provided error messages.

Improvements

The following highlights a few of the more significant improvements.

  • mysqlrpladmin errant transactions for switchover have been improved. Note : The errant transactions check requires all servers in the topology to have GTID’s enabled.
  • Failed MySQL server connection error messages now display the actual error returned from the …
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New! MySQL Utilities Now Supports SSL and Configuration Files
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The MySQL Utilities Team is pleased to announce a new release that contains our newest features – SSL and configuration file support. These were added to release-1.5.0-alpha.

How can I make a secure connection to my server via Utilities?

Use the new SSL command-line options that are available for all utilities:

–ssl-ca : The path to a file that contains a list of trusted SSL certificate authorities.
–ssl-cert : The name of the SSL certificate file to use for establishing a secure connection.
–ssl-key : The name of the SSL key file to use for establishing a secure connection.



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10 Newer Entries Showing entries 31 to 40 of 898 10 Older Entries

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