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Search Results
https://dev.mysql.com/doc/refman/5.7/en/charset-collation-effect.html
The second column shows the result of the SELECT using the German DIN-1 rule, which says that U-umlaut sorts with U. The third column shows the result of the SELECT using the German DIN-2 rule, which says that U-umlaut sorts with UE.
https://dev.mysql.com/doc/refman/5.7/en/charset-gb18030.html
Searches for ligatures also match uppercase ligatures when using the gb18030_unicode_520_ci collation. Use this collation if you need to ensure that ligatures are sorted correctly. In MySQL, the gb18030 character set corresponds to the “Chinese ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-next-key-locking.html
If the locks set on the index records in the scanned range do not lock out inserts made in the gaps (in this case, the gap between 90 and 102), another session can insert a new row into the table with an id of 101. InnoDB performs row-level locking ... The so-called phantom problem occurs within a transaction when the same query produces different sets of rows at different ...
https://dev.mysql.com/doc/refman/5.7/en/ldml-collation-example.html
Phone numbers can be given in very different formats: +7-12345-67 +7-12-345-67 +7 12 345 67 +7 (12) 345 67 +71234567 The problem raised by dealing with these kinds of values is that the varying permissible formats make searching for a specific phone ... To add a UCA collation for a Unicode character set without recompiling MySQL, use the following ...
https://dev.mysql.com/doc/refman/5.7/en/change-replication-filter.html
Filters set using this statement differ from those set using the server options in two key respects: The statement does not require restarting the server to take effect, only that the replication SQL thread be stopped using STOP SLAVE SQL_THREAD ...
https://dev.mysql.com/doc/refman/5.7/en/channels-startup-options.html
This section describes startup options which are impacted by the addition of replication channels. If this variable is set to FILE, attempting to add more sources to a replica fails with ER_SLAVE_NEW_CHANNEL_WRONG_REPOSITORY. If this variable is ...
https://dev.mysql.com/doc/refman/5.7/en/charset-unicode-conversion.html
This section describes issues that you may face when converting character data between the utf8mb3 and utf8mb4 character sets. Note This discussion focuses primarily on converting between utf8mb3 and utf8mb4, but similar principles apply to ...The ...
https://dev.mysql.com/doc/refman/5.7/en/error-lost-connection.html
Usually it indicates network connectivity trouble and you should check the condition of your network if this error occurs frequently. If the error message includes “during query,” this is probably the case you are experiencing. If you know that ...Sometimes the “during query” form happens when millions of rows are being sent as part of one or more ...
https://dev.mysql.com/doc/refman/5.7/en/error-message-elements.html
This section discusses how error messages originate within MySQL and the elements they contain. Example server-side error messages written to the error log: This message produced during the startup process provides a status or progress indicator: ...Error Message Sources Error Message Elements Error Message Sources Error messages can originate on the server side or the client side: On the server side, error messages may occur during the startup and shutdown processes, as a result of issues that occur during SQL statement execution, and so ...
https://dev.mysql.com/doc/refman/5.7/en/events-configuration.html
Events are executed by a special event scheduler thread; when we refer to the Event Scheduler, we actually refer to this thread. It is also possible to use 0 for OFF, and 1 for ON when setting this variable. For this reason, ON and OFF are usually ...When running, the event scheduler thread and its current state can be seen by users having the PROCESS privilege in the output of SHOW PROCESSLIST, as shown in the discussion that ...