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https://dev.mysql.com/doc/refman/5.7/en/cannot-roll-back.html
In general, these include data definition language (DDL) statements, such as those that create or drop databases, those that create, drop, or alter tables or stored routines. If you issue a statement early in a transaction that cannot be rolled ...
https://dev.mysql.com/doc/refman/5.7/en/charset-configuration.html
However, when character_set_system differs from character_set_server or character_set_client, and you input characters manually (as database object identifiers, column values, or both), these may be displayed incorrectly in output from the client or ... The MySQL server has a compiled-in default character set and ...
https://dev.mysql.com/doc/refman/5.7/en/charset-general.html
Mix strings with different character sets or collations in the same server, the same database, or even the same table. A character set is a set of symbols and encodings. A collation is a set of rules for comparing characters in a character set.
https://dev.mysql.com/doc/refman/5.7/en/charset-restrictions.html
Identifiers are stored in mysql database tables (user, db, and so forth) using utf8, but identifiers can contain only characters in the Basic Multilingual Plane (BMP). The ucs2, utf16, utf16le, and utf32 character sets have the following ...
https://dev.mysql.com/doc/refman/5.7/en/charset-syntax.html
There are default settings for character sets and collations at four levels: server, database, table, and column. The description in the following sections may appear complex, but it has been found in practice that multiple-level defaulting leads ...
https://dev.mysql.com/doc/refman/5.7/en/charset-table.html
Otherwise (neither CHARACTER SET nor COLLATE is specified), the database character set and collation are used. Every table has a table character set and a table collation. The CREATE TABLE and ALTER TABLE statements have optional clauses for ...
https://dev.mysql.com/doc/refman/5.7/en/charset.html
The default MySQL server character set and collation are latin1 and latin1_swedish_ci, but you can specify character sets at the server, database, table, column, and string literal levels. MySQL includes character set support that enables you to ...
https://dev.mysql.com/doc/refman/5.7/en/concurrent-inserts.html
However, this cannot be used if you are going to manipulate the database using processes external to the server while you hold the lock. If there are multiple INSERT statements, they are queued and performed in sequence, concurrently with the SELECT ...
https://dev.mysql.com/doc/refman/5.7/en/connection-access.html
In particular, do not give nonadministrative users read access to tables in the mysql system database. When you attempt to connect to a MySQL server, the server accepts or rejects the connection based on these conditions: Your identity and whether ...
https://dev.mysql.com/doc/refman/5.7/en/constraint-foreign-key.html
Foreign keys let you cross-reference related data across tables, and foreign key constraints help keep this spread-out data consistent. MySQL supports ON UPDATE and ON DELETE foreign key references in CREATE TABLE and ALTER TABLE statements. The ...