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https://dev.mysql.com/doc/refman/5.7/en/mysql.html
This forces mysql to retrieve results from the server a row at a time rather than retrieving the entire result set and buffering it in memory before displaying it. This is done by returning the result set using the mysql_use_result() C API function ... mysql is a simple SQL shell with input line editing ...
https://dev.mysql.com/doc/refman/5.7/en/not-enough-file-handles.html
This may not entirely prevent running out of file descriptors because in some circumstances the server may attempt to extend the cache size temporarily, as described in Section 8.4.3.1, “How MySQL Opens and Closes Tables”. You can remove the # ... If you get ERROR 'file_name' not found (errno: 23), Can't open file: file_name (errno: 24), or any other error with errno 23 or errno 24 from MySQL, it means that you have not allocated enough file descriptors for the MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/numeric-type-attributes.html
This optional display width may be used by applications to display integer values having a width less than the width specified for the column by left-padding them with spaces. (That is, this width is present in the metadata returned with result sets. As with integer types, this attribute prevents negative values from being stored in the ... MySQL supports an extension for optionally specifying ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-myisam-bulk-data-loading.html
This does not update any indexes and therefore is very fast. This creates the index tree in memory before writing it to disk, which is much faster than updating the index during LOAD DATA because it avoids lots of disk seeks. UNLOCK TABLES; This ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-management.html
This clause has the same syntax as that as used with CREATE TABLE for creating a partitioned table, and always begins with the keywords PARTITION BY. MySQL 5.7 provides a number of ways to modify partitioned tables. It is possible to add, drop, ...
https://dev.mysql.com/doc/refman/5.7/en/pattern-matching.html
When you test for a match for this type of pattern, use the REGEXP and NOT REGEXP operators (or RLIKE and NOT RLIKE, which are synonyms). (This differs from a LIKE pattern match, which succeeds only if the pattern matches the entire value.) To ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-accounts-table.html
For a description of how the Performance Schema maintains rows in this table, including the effect of TRUNCATE TABLE, see Section 25.12.8, “Performance Schema Connection Tables”. This is NULL for an internal thread, or for a user session that ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-stages-current-table.html
END_EVENT_ID This column is set to NULL when the event starts and updated to the thread current event number when the event ends. This enables you to check the source to determine exactly what code is involved. NESTING_EVENT_ID The EVENT_ID value of ...The table stores one row per thread showing the current status of the thread's most recent monitored stage event, so there is no system variable for configuring the table ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-instrumentation-checking.html
Changes to this code occur often, which also affects the set of instruments. This information is always up to date for your version of MySQL, also includes instrumentation for instrumented plugins you might have installed that are not part of the ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-memory-model.html
Data collected by the Performance Schema for this buffer is lost, and any corresponding “lost instance” counters are incremented. This query shows the information associated with the memory instruments: SELECT * FROM ...Memory used depends on ...