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https://dev.mysql.com/doc/refman/8.0/en/charset-general.html
Mix strings with different character sets or collations in the same server, the same database, or even the same table. To use these features effectively, you must know what character sets and collations are available, how to change the defaults, and ...Let's make the distinction clear with an example of an imaginary character ...
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-utf16.html
Because MySQL must allow for the worst case (that one character requires four bytes) the maximum length of a utf16 column or index is only half of the maximum length for a ucs2 column or index. The utf16 character set is the ucs2 character set with ...
https://dev.mysql.com/doc/refman/8.0/en/creating-many-tables.html
If you have many MyISAM tables in the same database directory, open, close, and create operations are slow. If you execute SELECT statements on many different tables, there is a little overhead when the table cache is full, because for every table ...You can reduce this overhead by increasing the number of entries permitted in the table ...
https://dev.mysql.com/doc/refman/8.0/en/cursor-restrictions.html
Server-side cursors are implemented in the C API using the mysql_stmt_attr_set() function. A server-side cursor enables a result set to be generated on the server side, but not transferred to the client except for those rows that the client ...In ...
https://dev.mysql.com/doc/refman/8.0/en/derived-condition-pushdown-optimization.html
When a derived table cannot be merged into the outer query (for example, if the derived table uses aggregation), pushing the outer WHERE condition down to the derived table should decrease the number of rows that need to be processed and thus speed ... MySQL 8.0.22 and later supports derived condition pushdown for eligible ...
https://dev.mysql.com/doc/refman/8.0/en/differences-from-ansi.html
We try to make MySQL Server follow the ANSI SQL standard and the ODBC SQL standard, but MySQL Server performs operations differently in some cases: There are several differences between the MySQL and standard SQL privilege systems. You must ...For ...
https://dev.mysql.com/doc/refman/8.0/en/document-store.html
This differs from working with a relational database and storing products in a table, when all columns of the table must be known and defined before adding any products to the database. Traditionally, relational databases such as MySQL have usually ... This chapter introduces an alternative way of working with MySQL as a document store, sometimes referred to as “using ...
https://dev.mysql.com/doc/refman/8.0/en/drop-index.html
To drop a primary key, the index name is always PRIMARY, which must be specified as a quoted identifier because PRIMARY is a reserved word: DROP INDEX `PRIMARY` ON t; Indexes on variable-width columns of NDB tables are dropped online; that is, ...
https://dev.mysql.com/doc/refman/8.0/en/except.html
query_expression_body EXCEPT [ALL | DISTINCT] query_expression_body [EXCEPT [ALL | DISTINCT] query_expression_body] [...] query_expression_body: See Section 15.2.14, “Set Operations with UNION, INTERSECT, and EXCEPT” EXCEPT limits the result ...
https://dev.mysql.com/doc/refman/8.0/en/federated-create.html
Important When you create the local table it must have an identical field definition to the remote table. To create a FEDERATED table you should follow these steps: Create the table on the remote server. Alternatively, make a note of the table ...