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https://dev.mysql.com/doc/refman/8.0/en/monitor-mysql-memory-use.html
Instruments can be enabled by updating the ENABLED column of the Performance Schema setup_instruments table. To view available MySQL memory instruments, query the Performance Schema setup_instruments table. After restarting the server, the ENABLED ... The following example demonstrates how to use Performance Schema and sys schema to monitor MySQL memory ...
https://dev.mysql.com/doc/refman/8.0/en/mrr-optimization.html
Reading rows using a range scan on a secondary index can result in many random disk accesses to the base table when the table is large and not stored in the storage engine's cache. Then the keys are sorted and finally the rows are retrieved from ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-enterprise-backup.html
The product is architected for efficient and reliable backups of tables created by the InnoDB storage engine. For completeness, it can also back up tables from MyISAM and other storage engines. MySQL Enterprise Backup does a hot backup of all tables ... MySQL Enterprise Backup performs hot backup operations for MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/optimize-character.html
The GROUP BY and ORDER BY clauses can generate temporary tables, and these temporary tables can use the MEMORY storage engine if the original table does not contain any BLOB columns. If a table contains string columns such as name and address, but ... For character and string columns, follow these guidelines: Use binary collation order for fast comparison and sort operations, when you do not need language-specific collation ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-columns-list.html
See Section 15.1.20, “CREATE TABLE Statement”, for additional information about PARTITION BY LIST COLUMNS() syntax. This is a variant of LIST partitioning that enables the use of multiple columns as partition keys, and for columns of data types ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-timing.html
For example, the standard gettimeofday() function can take hundreds of cycles, which is an unacceptable overhead for data gathering that may occur thousands or millions of times per second. Performance Schema Timer Representation in Events Rows in ... Events are collected by means of instrumentation added to the server source ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-examples.html
Consider these statements: mysql> CREATE TABLE t (i INT, d DECIMAL, f FLOAT); mysql> INSERT INTO t VALUES(1,1,1); mysql> CREATE TABLE y SELECT AVG(i), AVG(d), AVG(f) FROM t; The result is a double only for the floating-point argument. This section ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-partitioning.html
Figure 19.2 Replicating Databases to Separate Replicas You can achieve this separation by configuring the source and replicas as normal, and then limiting the binary log statements that each replica processes by using the --replicate-wild-do-table ... There may be situations where you have a single source server and want to replicate different databases to different ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-unexpected-replica-halt.html
From MySQL 8.0, this repository is created by default as an InnoDB table named mysql.slave_relay_log_info. DML transactions and also atomic DDL update the replication positions in the replica's applier metadata repository in the ... In order for ...
https://dev.mysql.com/doc/refman/8.0/en/secure-client-programming.html
If an application generates a query such as SELECT * FROM table WHERE ID=234 when a user enters the value 234, the user can enter the value 234 OR 1=1 to cause the application to generate the query SELECT * FROM table WHERE ID=234 OR 1=1. As a ...