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Rechercher dans le manuel MySQL
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https://dev.mysql.com/innodb-restrictions.html
For example, you might hit this limit with a column prefix index of more than 191 characters on a TEXT or VARCHAR column, assuming a utf8mb4 character set and the maximum of 4 bytes for each character. ERROR 1070 (42000): Too many key parts ...
https://dev.mysql.com/innodb-row-format.html
Tables that use the REDUNDANT row format store the first 768 bytes of variable-length column values (VARCHAR, VARBINARY, and BLOB and TEXT types) in the index record within the B-tree node, with the remainder stored on overflow pages. Tables that ...
https://dev.mysql.com/json.html
When the server later must read a JSON value stored in this binary format, the value need not be parsed from a text representation. The space required to store a JSON document is roughly the same as for LONGBLOB or LONGTEXT; see Section 11.8, ...The ...
https://dev.mysql.com/loading-tables.html
You could create a text file pet.txt containing one record per line, with values separated by tabs, and given in the order in which the columns were listed in the CREATE TABLE statement. To represent these in your text file, use \N (backslash, ...
https://dev.mysql.com/myisamchk-general-options.html
This is often the case when you have large key values for CHAR, VARCHAR, or TEXT columns, because the sort operation needs to store the complete key values as it proceeds. ft_min_word_len and ft_max_word_len indicate the minimum and maximum word ...
https://dev.mysql.com/mysql-cluster-install-configuration.html
NDB Cluster also provides a GUI installer which can be used to perform the configuration without the need to edit text files in a separate application. The configuration file should be located in the /etc directory and can be edited using any text ... In this section, we discuss manual configuration of an installed NDB Cluster by creating and editing configuration ...
https://dev.mysql.com/performance-schema-statement-digests.html
The statement event tables (events_statements_current, events_statements_history, and events_statements_history_long) have columns for storing normalized statement digests and the corresponding digest SHA-256 hash values: DIGEST_TEXT is the text of ... The MySQL server is capable of maintaining statement digest ...
https://dev.mysql.com/prepared-statements-instances-table.html
C API Function Corresponding Server Command mysql_stmt_prepare() COM_STMT_PREPARE mysql_stmt_execute() COM_STMT_EXECUTE mysql_stmt_close() COM_STMT_CLOSE The text protocol. For the text protocol, this column is the external statement name assigned ... The Performance Schema provides instrumentation for prepared statements, for which there are two protocols: The binary ...
https://dev.mysql.com/programs-overview.html
mysqldump A client that dumps a MySQL database into a file as SQL, text, or XML. mysqlimport A client that imports text files into their respective tables using LOAD DATA. myisam_ftdump A utility that displays information about full-text indexes in ...Later sections provide a more detailed description of each one, with the exception of NDB Cluster ...
https://dev.mysql.com/query-log.html
(This assumes that the general query log itself is enabled.) Passwords in statements written to the general query log are rewritten by the server not to occur literally in plain text. This option may be useful for diagnostic purposes, to see the ...
Document created the 26/06/2006, last modified the 26/10/2018
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