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How do I check MySQL database usage?
Analyze the total space used on the DB instance (user-created databases) To find the size of each user-created database, run the following query: mysql> SELECT table_schema, ROUND(SUM(data_length+index_length)/1024/1024/1024,2) “size in GB” FROM information_schema.
What datatype is used in MySQL database?
MySQL numeric data types
| Numeric Types | Description |
|---|---|
| INT | A standard integer |
| BIGINT | A large integer |
| DECIMAL | A fixed-point number |
| FLOAT | A single-precision floating point number |
What are different data types uses in MySQL explain all of them?
MySQL supports all standard SQL numeric data types which include INTEGER, SMALLINT, DECIMAL, and NUMERIC. It also supports the approximate numeric data types (FLOAT, REAL, and DOUBLE PRECISION). The keyword INT is a synonym for INTEGER, and the keywords DEC and FIXED are synonyms for DECIMAL.
What is the data type of image in MySQL?
BLOB
In MySQL, the preferred data type for image storage is BLOB. However, there are actually three flavors of BLOB. The one you choose depends on the size of the images that you will be storing.
What are the 3 categories of MySQL data types?
MySQL Data Types (Version 8.0) In MySQL there are three main data types: string, numeric, and date and time.
How to get the data type of a mySQL table?
You can get the MySQL table columns data type with the help of “information_schema.columns”. SELECT DATA_TYPE from INFORMATION_SCHEMA.COLUMNS where table_schema = ’yourDatabaseName’ and table_name = ’yourTableName’.
How to check where table is used in MySQL?
I want to check where this table is used in my database. For an example: I want to check if this table is used in any store procedure/function/view. How can i check in MySQL. In case, if you want to check only in stored procedure/ function / view, then you can join with INFORMATION_SCHEMA.ROUTINES
When to use double or float in MySQL?
A floating point number. MySQL uses the p value to determine whether to use FLOAT or DOUBLE for the resulting data type. If p is from 0 to 24, the data type becomes FLOAT (). If p is from 25 to 53, the data type becomes DOUBLE () DOUBLE ( size, d) A normal-size floating point number.
What are the date and time data types in MySQL?
The MySQL date and time datatypes are as follows − DATE − A date in YYYY-MM-DD format, between 1000-01-01 and 9999-12-31. For example, December 30 th, 1973 would be stored as 1973-12-30. DATETIME − A date and time combination in YYYY-MM-DD HH:MM:SS format, between 1000-01-01 00:00:00 and 9999-12-31 23:59:59.