In this blog, we will familiarize you to some very suitable statements that allow you to uphold database tables in MySQL.
MySQL offers numerous useful statements that allow you to preserve database tables efficiently. Those statements allow you to analyze, optimize, check, and repair database tables.
Analyze table statement
MySQL query optimizer is an significant component of the MySQL server that generates an ideal query performance plan for a query. For a specific query, the query optimizer uses the stored key dispersal and other features to decide the order in which tables should be joined when you performance the join, and which index should be used for a precise table.
Though, the key deliveries can be occasionally imprecise e.g., after you have done a lot of data variations in the table including insert, delete, or update. If the key dispersal is not precise, the query optimizer may pick a bad query execution plan that may reason a severe performance problem.
To solve this tricky, you can run the ANALYZE TABLE statement for the table e.g., the subsequent statement analyzes the payments table in the example database.
If there is no change to the table since the ANALYZE TABLE declaration ran, MySQL will not analyze the table once more. If you run the above statement another time:
It is saying that the table is before now up to date.
Optimize table statement
While at work with the database, you do a lot of changes such as insert, update and delete data in the table that may reason the physical storage of the table fragmented. As a outcome, the performance of database server is tainted.
MySQL delivers you with a statement that allows you to optimize the table to avoid this defragmenting problem. The subsequent demonstrates how to optimize a table:
It is suggested that you execute this statement for the tables that are updated frequently. For instance, if you want to improve the orders table to defragment it, you can perform the subsequent statement:
Check table statement
Somewhat wrong can occur to the database server e.g., the server was halt unexpectedly, error while writing data to the hard disk, etc. These circumstances could make the database operate erroneously and in the worst case, it can be stopped.
MySQL lets you to check the integrity of database tables by using the CHECK TABLE statement. The next illustrates the syntax of the CHECK TABLE statement:
The CHECK TABLE statement drafts both table and its indexes. For example, you can use the CHECK TABLE statement to crisscross the orders table as follows:
The CHECK TABLE statement only notices problems in a database table, but it does not repair them. To repair the table, you use the REPAIR TABLE statement.
Repair table statement
The REPAIR TABLE statement allows you to repair some errors happened in database tables. MySQL does not promise that the REPAIR TABLE statement can repair all errors that the tables may have.
The subsequent is the syntax of the REPAIR TABLE statement:
What if there are some errors in the orders table and you need to fix them, you can use the REPAIR TABLE statement as the subsequent query:
MySQL returns what it has done to the table and shows you whether the table was repaired or not.
In this blog, you have educated some very handy statements to uphold database tables in MySQL.