https://dev.mysql.com/faqs-cjk.html
Why do some LIKE and FULLTEXT searches with CJK characters fail? A.11.12. Sometimes adding or changing a <meta> tag suffices to correct the problem: for example, to insure that the user agent interprets page content as UTF-8, include <meta ... This ...
https://dev.mysql.com/faqs-innodb-change-buffer.html
What types of operations modify secondary indexes and result in change buffering? A.16.2. How much space does InnoDB use for the change buffer? A.16.5. How do I determine the current size of the change buffer? A.16.6. Where can I find additional ...
https://dev.mysql.com/features.html
Data Types Many data types: signed/unsigned integers 1, 2, 3, 4, and 8 bytes long, FLOAT, DOUBLE, CHAR, VARCHAR, BINARY, VARBINARY, TEXT, BLOB, DATE, TIME, DATETIME, TIMESTAMP, YEAR, SET, ENUM, and OpenGIS spatial types. An index may use a prefix of ... This section describes some of the important characteristics of the MySQL Database ...
https://dev.mysql.com/generated-column-index-optimizations.html
For example: CREATE TABLE t1 (f1 INT, gc INT AS (f1 + 1) STORED, INDEX (gc)); The generated column, gc, is defined as the expression f1 + 1. The column is also indexed and the optimizer can take that index into account during execution plan ...
https://dev.mysql.com/gis-wkt-functions.html
These functions take as arguments a Well-Known Text (WKT) representation and, optionally, a spatial reference system identifier (SRID). For a description of WKT format, see Well-Known Text (WKT) Format. ST_GeomFromText() accepts a WKT value of any ...Functions in this section detect arguments in either Cartesian or geographic spatial reference systems (SRSs), and return results appropriate to the ...
https://dev.mysql.com/group-replication-adding-instances.html
At this point, the group has one member in it, server s1, which has some data in it. It is now time to expand the group by adding the other two servers configured previously. In order to add a second instance, server s2, first create the ...
https://dev.mysql.com/group-replication-bootstrap.html
mysql> CREATE DATABASE test; mysql> USE test; mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 TEXT NOT NULL); mysql> INSERT INTO t1 VALUES (1, 'Luis'); Check the content of table t1 and the binary log. The process of starting a group for the first ...
https://dev.mysql.com/innodb-compression-tuning.html
Character strings often compress well, whether defined in CHAR, VARCHAR, TEXT or BLOB columns. Compressing in the Application If you compress data such as text in your application, before it is inserted into the database, You might save overhead for ... Most often, the internal optimizations described in InnoDB Data Storage and Compression ensure that the system runs well with compressed ...
https://dev.mysql.com/innodb-ft-config-table.html
The INNODB_FT_CONFIG table provides metadata about the FULLTEXT index and associated processing for an InnoDB table. Before querying it, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table ...The key names and their meanings include: optimize_checkpoint_limit: The number of seconds after which an OPTIMIZE TABLE run ...
https://dev.mysql.com/innodb-ft-default-stopword-table.html
The INNODB_FT_DEFAULT_STOPWORD table holds a list of stopwords that are used by default when creating a FULLTEXT index on InnoDB tables. For information about the default InnoDB stopword list and how to define your own stopword lists, see Section ...This is not used if you override the default stopword processing with either the innodb_ft_server_stopword_table or the innodb_ft_user_stopword_table system ...
