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https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndbd.html
--connect-delay=# Command-Line Format --connect-delay=# Deprecated Yes (removed in 5.7.36-ndb-7.6.21) Type Numeric Default Value 5 Minimum Value 0 Maximum Value 3600 Determines the time to wait between attempts to contact a management server when ...
https://dev.mysql.com/doc/refman/5.7/en/can-not-connect-to-server.html
If you get the error message Can't connect to MySQL server on some_host, you can try the following things to find out what the problem is: Check whether the server is running on that host by executing telnet some_host 3306 and pressing the Enter key ...After any port is closed it remains in TIME_WAIT status for 120 ...The error (2003) Can't connect to MySQL server on ... A MySQL client on Unix can connect to the mysqld server in two different ways: By using a Unix socket file to ...
https://dev.mysql.com/doc/refman/5.7/en/update.html
Each matching row is updated once, even if it matches the conditions multiple times. The UPDATE statement supports the following modifiers: With the LOW_PRIORITY modifier, execution of the UPDATE is delayed until no other clients are reading from ...
https://dev.mysql.com/doc/refman/5.7/en/problems.html
This section lists some common problems and error messages that you may encounter. It describes how to determine the causes of the problems and what to do to solve them.
https://dev.mysql.com/doc/refman/5.7/en/storage-requirements.html
DATETIME is packed more efficiently, requiring 5 rather than 8 bytes for the nonfractional part, and all three parts have a fractional part that requires from 0 to 3 bytes, depending on the fractional seconds precision of stored values. Fractional ... InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type Storage Requirements Date and Time Type Storage Requirements String Type Storage Requirements Spatial Type Storage Requirements JSON Storage Requirements The storage requirements for table data on disk depend on several ...
https://dev.mysql.com/doc/refman/5.7/en/char.html
If strict SQL mode is not enabled and you assign a value to a CHAR or VARCHAR column that exceeds the column's maximum length, the value is truncated to fit and a warning is generated. For example, a CHAR(255) column can exceed 768 bytes if the ...
https://dev.mysql.com/doc/refman/5.7/en/error-access-denied.html
Often the problem is related to the MySQL accounts that the server permits client programs to use when connecting. See Section 6.2, “Access Control and Account Management”, and Section 6.2.17, “Troubleshooting Problems Connecting to MySQL”.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-threads-table.html
PROCESSLIST_TIME The time in seconds that the thread has been in its current state. For a replica SQL thread, the value is the number of seconds between the timestamp of the last replicated event and the real time of the replica host. row ... The ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-statement-tables.html
A query that fails to parse differs from a query that parses but fails due to an error during execution. Consequently, there is no parsing at runtime and the type of each statement is known by the time it executes. The setup_timers table contains a ...Statement events occur at a high level of the event ...
https://dev.mysql.com/doc/refman/5.7/en/diagnostics-area.html
Standard SQL also supports GET STACKED DIAGNOSTICS syntax for referring to the second diagnostics area during condition handler execution. Execution of RESIGNAL The RESIGNAL statement passes on the error condition information that is available ...