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This section helps you get started with MySQL quickly if you have never worked with MySQL before. Textual 7 0 8 – lightweight irc client login.
- Introduction to MySQL
- Give a quick introduction to databases and MySQL as a Relational Database Management System (RDBMS)
- Install MySQL
- Show you step by step how to install MySQL Server on your computer for practicing with the tutorials.
- Connect to MySQL Server
- Walk you through the steps of connecting to the MySQL Server using mysql client program.
- Download a MySQL Sample Database
- Introduce you to a sample database called classicmodels and provide you with the link to download it
- Load the Sample Database
- show you how to load the classicmodels sample database to the MySQL Server.
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Like most relational databases, MySQL provides useful metadata about the database itself. While most other databases refer to this information as a
catalog
, the official MySQL documentation refers to the INFORMATION_SCHEMA
metadata as tables
. Toast titanium 17 3 – the ultimate media toolkit.Regardless of the name, what matters is the information provided by these
INFORMATION_SCHEMA
tables. Everything from views
and user_privilieges
to columns
and tables
can be found in the INFORMATION_SCHEMA
. For our purposes we’re particularly interested in the tables
metadata, which we can query to actually extract the size of various tables in the system.List Table Sizes From a Single Database
As can seen in the official documentation, the
INFORMATION_SCHEMA.TABLES
table contains around 20 columns, but for the purpose of determining the amount of disk space used by tables, we’ll focus on two columns in particular: DATA_LENGTH
and INDEX_LENGTH
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DATA_LENGTH
is the length (or size) of all data in the table (inbytes
).INDEX_LENGTH
is the length (or size) of the index file for the table (also inbytes
).
Armed with this information, we can execute a query that will list all tables in a specific database along with the disk space (size) of each. We can even get a bit fancier and convert the normal size values from
bytes
into something more useful and understandable to most people like megabytes
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In this example using the
bookstore
database, we’re combining the DATA_LENGTH
and INDEX_LENGTH
as bytes
, then dividing it by 1024
twice to convert into kilobytes
and then megabytes
. Our result set will look something like this:If you don’t care about all tables in the database and only want the size of a particular table, you can simply add
AND TABLE_NAME = 'your_table_name'
to the WHERE
clause. Here we only want information about the book
table:Get Mysql Server Version
The results, as expected, are now:
List All Table Sizes From ALL Databases
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If you’re running into an issue where your database is growing in size but you don’t know which table is the culprit, it may be useful to query for the size of all tables within all databases in the entire system. This can be accomplished easily with the following query:
Get Mysql Logs
This will return not only the size of the table, but also the table name and parent database it is associated with.