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https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-perror.html
ndb_perror shows information about an NDB error, given its error code. This includes the error message, the type of error, and whether the error is permanent or temporary. Added to the MySQL NDB Cluster distribution in NDB 7.6, it is intended as a ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-failover.html
You can use the following query to obtain the needed records from the ndb_binlog_index table on the source: mysqlS'> SELECT -> @file:=SUBSTRING_INDEX(next_file, '/', -1), -> @pos:=next_position -> FROM mysql.ndb_binlog_index -> WHERE epoch = ... In ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-config-editor.html
To see a command-specific help message, invoke mysql_config_editor as follows, where command is a command other than help: mysql_config_editor command --help --debug[=debug_options], -# debug_options Command-Line Format --debug[=debug_options] Type ... The mysql_config_editor utility enables you to store authentication credentials in an obfuscated login path file named ...
https://dev.mysql.com/doc/refman/5.7/en/mysqldump-delimited-text.html
INTO OUTFILE.) To enable data files to be written using a different format, mysqldump supports these options: --fields-terminated-by=str The string for separating column values (default: tab). This section describes how to use mysqldump to create ...
https://dev.mysql.com/doc/refman/5.7/en/null-values.html
Be aware that the NULL value is different from values such as 0 for numeric types or the empty string for string types. The NULL value means “no data.” NULL can be written in any lettercase. Treatment of \N as a synonym for NULL in SQL ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-storage-layout.html
Use the VARCHAR data type instead of CHAR to store variable-length strings or for columns with many NULL values. A CHAR(N) column always takes N characters to store data, even if the string is shorter or its value is NULL. Once your data reaches a ...
https://dev.mysql.com/doc/refman/5.7/en/option-files.html
The rules for escape sequences in option files differ slightly from the rules for escape sequences in string literals in SQL statements. Most MySQL programs can read startup options from option files (sometimes called configuration files). Option ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-columns-range.html
RANGE COLUMNS partitioning columns are not restricted to integer columns; string, DATE and DATETIME columns can also be used as partitioning columns. Range columns partitioning is similar to range partitioning, but enables you to define partitions ...
https://dev.mysql.com/doc/refman/5.7/en/pattern-matching.html
MySQL provides standard SQL pattern matching as well as a form of pattern matching based on extended regular expressions similar to those used by Unix utilities such as vi, grep, and sed. SQL pattern matching enables you to use _ to match any ...
https://dev.mysql.com/doc/refman/5.7/en/range-optimization.html
Additionally, for BTREE indexes, comparison of a key part with a constant value is a range condition when using the >, <, >=, <=, BETWEEN, !=, or <> operators, or LIKE comparisons if the argument to LIKE is a constant string that does not start with ... The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index value ...