Author: Goutham

SECURING MYSQL SERVER –

mysql_secure_installation is a script useful to

• set root password
• disallowing root login remotely
• removing anonymous user accounts after first installation
• removing test database which can be accessed by any users

Above script would work for default socket location i.e /var/lib/mysql/mysql.sock

If the server is started with a non-default socket location, mysql_secure_installation does not consider any socket options you specify and the script would fail (For example -> mysql_secure_installation –socket=/mysql/socket/mysql.sock)

We should also consider this situation in case if we need to install more than one instance of mysql on a single server. Read More

A simple way for adding future partitions or purging old partitions is through mysql procedures. Later we can use any scheduler or a cronjob to call this procedure daily.

Here I will provide a sample procedure for maintainance of a daily partitioned table based on a datetime column. Please do look at my previous post on mysql range partitioning in the following post. I have taken the example from this post and modified it based on our requirement.

First we will create a sample table along with a partition for our testing purposes.

mysql> create table test_partitions(id int,name varchar(50),tx_date datetime);
mysql> alter table test_partitions PARTITION BY RANGE (to_seconds(tx_date)) (
partition test_partitions_16092015 values less than ( to_seconds('2015-09-17 00:00:00') ));

Now lets create a table for holding list of tables and number of partitions to preserve/drop.

mysql> create table test.part_tables(dbname varchar(50),tabname varchar(50),numpart int,nextpart int);

Lets go ahead and insert a sample row there :

mysql> insert into test.part_tables values('test','test_partitions',30,7);

So, we will be preserving only last 30 days partitions and make sure we have next 7 days partitions for ‘test_partitions’ table.

Mysql Procedure 1 (part_maint) : This procedure takes in table list from our meta-table i.e part_tables and runs partition maintainance for each table :

Read More

Here is a simple example for partitioning a mysql table based on datetime column :

• Creating a test table

mysql> create table test_partitions(id int,name varchar(50),tx_date datetime);
Query OK, 0 rows affected (11.83 sec)

• Creating a initial partition :

alter table test_partitions PARTITION BY RANGE (to_seconds(tx_date)) (
partition test_partitions_16052016 values less than ( to_seconds('2016-05-17 00:00:00') ));

• Adding new partition:

mysql> alter table test_partitions add partition ( partition test_partitions_17052016 values less than ( to_seconds('2016-05-18 00:00:00') ));
Query OK, 0 rows affected (10.87 sec)
Records: 0 Duplicates: 0 Warnings: 0

• Verifying data in specific partition

Read More