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https://dev.mysql.com/doc/refman/5.7/en/column-count-limit.html
The exact column limit depends on several factors: The maximum row size for a table constrains the number (and possibly size) of columns because the total length of all columns cannot exceed this size. If a row containing variable-length columns ...
https://dev.mysql.com/doc/refman/5.7/en/error-log-windows.html
On Windows, mysqld uses the --log-error, --pid-file, and --console options to determine whether mysqld writes the error log to the console or a file, and, if to a file, the file name: If --console is given, mysqld writes the error log to the ...In ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-limitations-error-handling.html
Starting, stopping, or restarting a node may give rise to temporary errors causing some transactions to fail. When first starting a node, it is possible that you may see Error 1204 Temporary failure, distribution changed and similar temporary ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-tc-time-track-stats.html
This is the number of times that this activity occurred with a latency within the range specified by the row (that is, where the latency does not exceed the upper bound). key_op_errors Based on duration of all unsuccessful key read or write ... The ...A set of counters is maintained for each activity, each counter covering a range of latencies less than or equal to an upper ...
https://dev.mysql.com/doc/refman/5.7/en/error-log-unix.html
On Unix and Unix-like systems, mysqld uses the --log-error option to determine whether mysqld writes the error log to the console or a file, and, if to a file, the file name: If --log-error is not given, mysqld writes the error log to the console.
https://dev.mysql.com/doc/refman/5.7/en/error-log.html
The error log contains a record of mysqld startup and shutdown times. This section discusses how to configure the MySQL server for logging of diagnostic messages to the error log. For information about selecting the error message character set and ...
https://dev.mysql.com/doc/refman/5.7/en/error-log-syslog.html
It is possible to have mysqld write the error log to the system log (the Event Log on Windows, and syslog on Unix and Unix-like systems). To do so, use these system variables: log_syslog: Enable this variable to send the error log to the system log. Note Error logging to the system log may require additional system ...(On Windows, log_syslog is enabled by default.) If log_syslog is ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-event-tables.html
After 5 minutes (300 seconds) of execution: A and B have generated 300 and 30,000 events, respectively. After 5 seconds of execution: A and B have generated 5 and 500 events, respectively. events_xxx_history: The “recent history” table stores ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-statement-digests.html
Normalization permits statements that are similar to be grouped and summarized to expose information about the types of statements the server is executing and how often they occur. If the Performance Schema has digest instrumentation enabled, it ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-select-all.html
--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving up. --connect-retry-delay Command-Line Format --connect-retry-delay=# Type ...