Limit content size by character or word in database

1. What is the limit of text data type?
2. What is the maximum size of char columns?
3. Should I use varchar or text?
4. What could be the maximum length of all text type field?
5. What is Number data type?
6. What is the maximum length of long text?
7. What is Max varchar size?
8. Can I use varchar 1000?
9. What does varchar 20 mean?
10. Is text slower than varchar?
11. What is text () in MySQL?
12. What does varchar 255 mean?

What is the limit of text data type?

A TEXT column has a theoretical limit of 2 ³¹ bytes (two gigabytes) and a practical limit that your available disk storage determines. No more than 195 columns of the same table can be declared as TEXT data types.

What is the maximum size of char columns?

The CHAR and VARCHAR types are declared with a length that indicates the maximum number of characters you want to store. For example, CHAR(30) can hold up to 30 characters. The length of a CHAR column is fixed to the length that you declare when you create the table. The length can be any value from 0 to 255.

Should I use varchar or text?

A VARCHAR can be part of an index whereas a TEXT field requires you to specify a prefix length, which can be part of an index. VARCHAR is stored inline with the table (at least for the MyISAM storage engine), making it potentially faster when the size is reasonable.

What could be the maximum length of all text type field?

However, the TEXT types are stored outside the table itself and only contribute 1 to 4 bytes towards that limit.
...
Maximum length for MySQL TEXT field types.

What is Number data type?

Numeric data types are numbers stored in database columns. These data types are typically grouped by: Exact numeric types, values where the precision and scale need to be preserved. The exact numeric types are INTEGER , BIGINT , DECIMAL , NUMERIC , NUMBER , and MONEY .

What is the maximum length of long text?

A TEXT column with a maximum length of 4,294,967,295 or 4GB ( 2³² - 1 ) characters. The effective maximum length is less if the value contains multi-byte characters. The effective maximum length of LONGTEXT columns also depends on the configured maximum packet size in the client/server protocol and available memory.

What is Max varchar size?

The maximum length of a VARCHAR in MySQL is subject to the maximum row size of 65,535 bytes, which is shared among all columns except TEXT/BLOB columns and the character set used. It means the total column should not be more than 65535 bytes.

Can I use varchar 1000?

The maximum key length is 1000 bytes. ... Nevertheless you can have an index on varchar columns bigger than 1000 bytes as you can read in my answer below. Or if you are using InnoDB, then there are some restrictions: Index key prefixes can be up to 767 bytes.

What does varchar 20 mean?

The data type of varchar is Variable-length with non-Unicode character data. The storage size is the actual length of data entered + 2 bytes. • For varchar (20): The max storage size is: 20*1 byte +2 bytes=22 bytes; •

Is text slower than varchar?

Short answer: No practical, performance, or storage, difference. Long answer: There is essentially no difference (in MySQL) between VARCHAR(3000) (or any other large limit) and TEXT .

What is text () in MySQL?

TEXT is the family of column type intended as high-capacity character storage. The actual TEXT column type is of four types-TINYTEXT, TEXT, MEDIUMTEXT and LONGTEXT. The four TEXT types are very similar to each other; the only difference is the maximum amount of data each can store.

What does varchar 255 mean?

Now, how does VARCHAR work? If you specify it as VARCHAR(255), that means that the column will reserve 1 byte + length of the string bytes. That 1 byte indicates how long the string is. 1 byte = you can have from 0 - 255 values stored (2 to the power of 8 = 256).