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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-queries.html
If the event tables contain both file and nonfile information, post-filtering is another way to see information only for file events. Pre-filtering limits which event information is collected and is independent of any particular user. By contrast, ...
https://dev.mysql.com/doc/refman/5.7/en/perror.html
perror prints a description for a system error code or for a storage engine (table handler) error code. For most system errors, MySQL displays, in addition to an internal text message, the system error code in one of the following styles: message ...
https://dev.mysql.com/doc/refman/5.7/en/pluggable-storage-common-layer.html
Physical Storage: This involves everything from the overall page size for tables and indexes as well as the format used for storing data to physical disk. A MySQL pluggable storage engine is the component in the MySQL database server that is ...
https://dev.mysql.com/doc/refman/5.7/en/precision-math-decimal-characteristics.html
The storage required for remaining digits is given by the following table. This section discusses the characteristics of the DECIMAL data type (and its synonyms), with particular regard to the following topics: Maximum number of digits Storage ...
https://dev.mysql.com/doc/refman/5.7/en/precision-math-rounding.html
This section discusses precision math rounding for the ROUND() function and for inserts into columns with exact-value types (DECIMAL and integer). The ROUND() function rounds differently depending on whether its argument is exact or approximate: ...
https://dev.mysql.com/doc/refman/5.7/en/problems-with-null.html
For example, the following statements are completely different: mysql> INSERT INTO my_table (phone) VALUES (NULL); mysql> INSERT INTO my_table (phone) VALUES (''); Both statements insert a value into the phone column, but the first inserts a NULL ...
https://dev.mysql.com/doc/refman/5.7/en/program-variables.html
Many MySQL programs have internal variables that can be set at runtime using the SET statement. See Section 13.7.4.1, “SET Syntax for Variable Assignment”, and Section 5.1.8, “Using System Variables”. Most of these program variables also ...
https://dev.mysql.com/doc/refman/5.7/en/query-cache-thread-states.html
invalidating query cache entries Query cache entries are being marked invalid because the underlying tables have changed. These thread states are associated with the query cache (see Section 8.10.3, “The MySQL Query Cache”). checking privileges ...
https://dev.mysql.com/doc/refman/5.7/en/replace-third-party-yum.html
mysql_upgrade also performs other functions; see Section 4.4.7, “mysql_upgrade — Check and Upgrade MySQL Tables” for details. For supported Yum-based platforms (see Section 2.5.1, “Installing MySQL on Linux Using the MySQL Yum ...
https://dev.mysql.com/doc/refman/5.7/en/replication-bugs.html
When you have determined that there is no user error involved, and replication still either does not work at all or is unstable, it is time to send us a bug report. If you have a repeatable test case that demonstrates the bug, please enter it into ...We need to obtain as much information as possible from you to be able to track down the ...