MySQL uses different type of threads for running specific utilities like mysql_install_db, flushes MyISAM tables, Replication, TCP/IP sockets etc. All threads can run with four different priorities like Interrupt, connect, wait and query priorities. Different types of threads are: The main thread : This one is created by MySQL client normally, this will be one … Continue Reading
Category Archives: Mysql
mysqldiskusage – to see database disk usage by MySQL Workbench
As we know, MySQL workbench is excellent GUI tool for managing MySQL DB servers, creating ERDs (Data Modelling) and for sql development. But with this GUI tool, we are getting some command-line utilities too like mysqldiskusage, mysqlindexcheck, mysqlfailover, mysqldiff, mysqldbcompare etc., Here, I’m describing mysqldiskusage utility, which is not only displays mysql db usage but … Continue Reading
mysqlslap – to check client load in MySQL 5.1
mysqlslap is native mysql utility to check client load in MySQL server. It’s introduced in MySQl 5.1. It seems very useful as it has lots of options to check load of your server by running different kind of queries with specific iterations, specific concurrency. Output will give you how much max/min/avg time has been taken … Continue Reading
slow_log and general_log tables in MySQL 5.1
“Server log tables” is one of the finest feature in MySQL 5.1 version but It looks like people are not using this feature regularly or perhaps they are happy with files only. Here, I’m explaining how we can enable that feature, use it and how it will be helpful for filtering the required statements in … Continue Reading
Communication protocols in MySQL
Generally, MySQL supports connections between clients and the server using several networking protocols. Below are the main protocols which are used by client to connect with MySQL server. TCP/IP Unix socket file Named pipe Shared memory TCP/IP connections are supported by any MySQL server unless the server is started with the –skip-networking option. These connections … Continue Reading
Event scheduler in MySQL 5.1
I just recently used Event scheduler which was the major feature in MySQL 5.1 version. Its very much similar to the linux crontab functionality. MySQL Event is nothing but a bunch of statements which we can run on specific schedule. When you will create any event, its just a database object like table, view or … Continue Reading
Some guidelines for MySQL security
Don’t share root user password and mysql.user table acess with anyone till you have full trust on it. Because that encrypted password is real password in MySQL so if anyone knows that than he/she can easily login with any user if he has access to his host. Check with “mysql -uroot ” command, If you … Continue Reading
some facts about MyISAM file handling and .MYI file In MySQL
Some facts about MyISAM File handling: • If a table is never updated, MySQL will never touch the table files, so it would never be marked as closed or corrupted. • If a table is marked readonly by the OS, it will only be opened in readonly mode. Any updates to it will fail. • … Continue Reading