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https://dev.mysql.com/doc/refman/8.0/en/symbolic-links-to-databases.html
On Unix, symlink a database using this procedure: Create the database using CREATE DATABASE: mysql> CREATE DATABASE mydb1; Using CREATE DATABASE creates the database in the MySQL data directory and permits the server to update the data dictionary ...Stop the server to ensure that no activity occurs in the new database while it is being ...
https://dev.mysql.com/doc/refman/8.0/en/temporary-files.html
For some statements, MySQL creates temporary SQL tables that are not hidden and have names that begin with #sql. Some SELECT queries creates temporary SQL tables to hold intermediate results. DDL operations that rebuild the table and are not ... On ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-background.html
The most common way to create a fault-tolerant system is to resort to making components redundant, in other words the component can be removed and the system should continue to operate as expected. This creates a set of challenges that raise ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-statistics-table.html
SEQ_IN_INDEX The column sequence number in the index, starting with 1. However, prefix lengths for index specifications in CREATE TABLE, ALTER TABLE, and CREATE INDEX statements are interpreted as number of characters for nonbinary string types ...
https://dev.mysql.com/doc/refman/8.0/en/lock-instance-for-backup.html
LOCK INSTANCE FOR BACKUP prevents files from being created, renamed, or removed. LOCK INSTANCE FOR BACKUP permits DDL operations that only affect user-created temporary tables. In effect, files that belong to user-created temporary tables can be ...
https://dev.mysql.com/doc/refman/8.0/en/myisampack.html
(myisampack creates an intermediate file named tbl_name.TMD in the database directory while it compresses the table. --tmpdir=dir_name, -T dir_name Command-Line Format --tmpdir=dir_name Type Directory name Use the named directory as the location ...
https://dev.mysql.com/doc/refman/8.0/en/optimize-table.html
Use OPTIMIZE TABLE in these cases, depending on the type of table: After doing substantial insert, update, or delete operations on an InnoDB table that has its own .ibd file because it was created with the innodb_file_per_table option enabled. To ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-diskio.html
For example, creating a new MySQL instance and its associated data files could cause large surges of disk write activity, impeding the performance of other MySQL instances that use the same storage devices. For more information, refer to the ... If ...
https://dev.mysql.com/doc/refman/8.0/en/show-index.html
Seq_in_index The column sequence number in the index, starting with 1. However, prefix lengths for index specifications in CREATE TABLE, ALTER TABLE, and CREATE INDEX statements are interpreted as number of characters for nonbinary string types ...
https://dev.mysql.com/doc/refman/8.0/en/upgrade-binary-package.html
If not, the server creates them in the data directory, populates them with metadata, and then proceeds with its normal startup sequence. Important If you have tables that contain generated columns, use the mysqldump utility provided with MySQL 5.7.9 ... This section describes how to upgrade MySQL binary and package-based installations on ...