What should be the collation in MySQL?

What MySQL collation should I use?

It is best to use character set utf8mb4 with the collation utf8mb4_unicode_ci . The character set, utf8 , only supports a small amount of UTF-8 code points, about 6% of possible characters. utf8 only supports the Basic Multilingual Plane (BMP).

What is the default collation for MySQL?

MySQL uses the latin1 as the default character set. Therefore, the default collation is latin1_swedish_ci . You can change these settings at server startup. If you specify one character set at server startup, MySQL will use the default collation of that character set.

What is the meaning of collation in MySQL?

A collation in MySQL is a set of rules used to compare the characters in a specific character set. It is a sequence of orders to any particular set. MySQL supports various character sets, and each character set always uses one or more collation, at least one default collation.

What is utf8 collation in MySQL?

utf8_general_ci is a legacy collation that does not support expansions, contractions, or ignorable characters. It can make only one-to-one comparisons between characters. MySQL implements utf8 language-specific collations if the ordering with utf8_unicode_ci does not work well for a language.

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What is the difference between utf8 and Latin1?

They are different encodings (with some characters mapped to common byte sequences, e.g. the ASCII characters and many accented letters). UTF-8 is one encoding of Unicode with all its codepoints; Latin1 encodes less than 256 characters.

What is difference between InnoDB and MyISAM?

InnoDB vs MyISAM

InnoDB has row-level locking. MyISAM only has full table-level locking. InnoDB has what is called referential integrity which involves supporting foreign keys (RDBMS) and relationship constraints, MyISAM does not (DMBS). InnoDB supports transactions, which means you can commit and roll back.

How do I convert MySQL to utf8mb4?

Switching from MySQL’s utf8 to utf8mb4

  1. Step 1: Create a backup. …
  2. Step 2: Upgrade the MySQL server. …
  3. Step 3: Modify databases, tables, and columns. …
  4. Step 4: Check the maximum length of columns and index keys. …
  5. Step 5: Modify connection, client, and server character sets. …
  6. Step 6: Repair and optimize all tables.

Why MyISAM gives the best performance?

MyISAM is designed with the idea that your database is queried far more than its updated and as a result it performs very fast read operations. If your read to write(insert|update) ratio is less than 15% its better to use MyISAM.

How do I set MySQL to UTF 8?

To change the character set encoding to UTF-8 for the database itself, type the following command at the mysql> prompt. Replace dbname with the database name: ALTER DATABASE dbname CHARACTER SET utf8 COLLATE utf8_general_ci; To exit the mysql program, type q at the mysql> prompt.

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What is SQL_Latin1_General_CP1_CI_AS?

The SQL_Latin1_General_CP1_CI_AS collation is a SQL collation and the rules around sorting data for unicode and non-unicode data are different. … – The Windows collation can use an index while comparing unicode and non-unicode, such as nvarchar to varchar, with a slight performance cost.

What is character set and collation?

A character set is a set of characters while a collation is the rules for comparing and sorting a particular character set. For example, a subset of a character set could consist of the letters A , B and C . A default collation could define these as appearing in an ascending order of A, B, C .

What is varchar MySQL?

Varchar in MySQL is a data type used for storing text whose length can have a maximum of 65535 characters. The varchar columns in the table are of variable length string that can hold either numeric or character or both.

Is a UTF 8 character?

UTF-8 is a variable-width character encoding used for electronic communication. Defined by the Unicode Standard, the name is derived from Unicode (or Universal Coded Character Set) Transformation Format – 8-bit.


Standard Unicode Standard
Transforms / Encodes ISO 10646 (Unicode)
Preceded by UTF-1
v t e

What is the difference between utf8 and utf8mb4?

The difference between utf8 and utf8mb4 is that the former can only store 3 byte characters, while the latter can store 4 byte characters. In Unicode terms, utf8 can only store characters in the Basic Multilingual Plane, while utf8mb4 can store any Unicode character.