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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 ...
https://dev.mysql.com/doc/refman/8.0/en/drop-function-loadable.html
(DROP FUNCTION is also used to drop stored functions; see Section 15.1.29, “DROP PROCEDURE and DROP FUNCTION Statements”.) DROP FUNCTION is the complement of CREATE FUNCTION. During the normal startup sequence, the server loads functions ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-locking.html
For such cases, InnoDB creates a hidden clustered index and uses this index for record locking. Client A creates a table containing two index records (90 and 102) and then starts a transaction that places an exclusive lock on index records with an ...Shared and Exclusive Locks Intention Locks Record Locks Gap Locks Next-Key Locks Insert Intention Locks AUTO-INC Locks Predicate Locks for Spatial Indexes Shared and Exclusive Locks InnoDB implements standard row-level locking where there are two types of locks, shared (S) locks and exclusive (X) ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-migration.html
To move databases in a binary format from Unix to Windows or from Windows to Unix, create all databases and tables using lowercase names. In addition, MySQL Enterprise Backup can create compressed backup files, and back up subsets of tables. The ...