Rechercher dans le manuel MySQL
Search Results
https://dev.mysql.com/charset-applications.html
Specify character settings at configuration time, if you build MySQL from source. If most or all applications use the same character set, specifying character settings at server startup or configuration time may be most convenient. Applications that ... For applications that store data using the default MySQL character set and collation (utf8mb4, utf8mb4_0900_ai_ci), no special configuration should be ...
https://dev.mysql.com/check-table.html
Otherwise, if there is a possible incompatibility, the server runs a full check on the table (which might take some time). Changes are sometimes made to character sets or collations that require table indexes to be rebuilt. A table is reported as ...
https://dev.mysql.com/clone-plugin-monitoring.html
Monitoring Cloning Operations using Performance Schema Clone Tables Monitoring Cloning Operations Using Performance Schema Stage Events Monitoring Cloning Operations Using Performance Schema Clone Instrumentation The Com_clone Status Variable A ...
https://dev.mysql.com/create-view.html
The view definition is “frozen” at creation time and is not affected by subsequent changes to the definitions of the underlying tables. The DEFINER and SQL SECURITY clauses specify the security context to be used when checking access privileges ...If the view does not exist, CREATE OR REPLACE VIEW is the same as CREATE ...
https://dev.mysql.com/data-type-defaults.html
See Section 11.2.5, “Automatic Initialization and Updating for TIMESTAMP and DATETIME”. The exception is that, for TIMESTAMP and DATETIME columns, you can specify CURRENT_TIMESTAMP as the default. See Section 11.2.5, “Automatic Initialization ... Data type specifications can have explicit or implicit default ...
https://dev.mysql.com/disk-issues.html
This makes both the seek and read times better, assuming that the disk is not used for other purposes as well. RAID N can be a problem if you have many writes, due to the time required to update the parity bits. You can also set the parameters for ... This section describes ways to configure storage devices when you can devote more and faster storage hardware to the database ...
https://dev.mysql.com/error-log-rule-based-filtering.html
The count value indicates the permitted number of events to log per time window. The window_size value is the time window in seconds; if omitted, the default window is 60 seconds. The log_filter_dragnet log filter component enables log filtering ...
https://dev.mysql.com/expressions.html
For the - operator, INTERVAL expr unit is permitted only on the right side, because it makes no sense to subtract a date or datetime value from an interval. This is analogous to the way that MySQL interprets TIME values as representing elapsed time ... This section lists the grammar rules that expressions must follow in MySQL and provides additional information about the types of terms that may appear in ...
https://dev.mysql.com/fulltext-boolean.html
| +----+-----------------------+-------------------------------------+ Note In implementing this feature, MySQL uses what is sometimes referred to as implied Boolean logic, in which + stands for AND - stands for NOT [no operator] implies OR Boolean ... MySQL can perform boolean full-text searches using the IN BOOLEAN MODE ...
https://dev.mysql.com/fulltext-fine-tuning.html
Most full-text variables described in this section must be set at server startup time. The innodb_ft_num_word_optimize option defines the number of words that are optimized each time OPTIMIZE TABLE is run. The default setting is 2000, which means ...
Document created the 26/06/2006, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/mysql-rf-fct-time-p-22.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
