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https://dev.mysql.com/doc/refman/8.0/en/drop-index.html
algorithm_option: ALGORITHM [=] {DEFAULT | INPLACE | COPY} lock_option: LOCK [=] {DEFAULT | NONE | SHARED | EXCLUSIVE} DROP INDEX drops the index named index_name from the table tbl_name. This statement is mapped to an ALTER TABLE statement to drop ...This is done automatically by the server whenever it determines that it is possible to do so; you do not have to use any special SQL syntax or server options to cause it to ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool-resize.html
Before you change innodb_buffer_pool_chunk_size, calculate the effect on innodb_buffer_pool_size to ensure that the resulting buffer pool size is acceptable. Monitoring Online Buffer Pool Resizing Progress The Innodb_buffer_pool_resize_status ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-change-buffer.html
On disk, the change buffer is part of the system tablespace, where index changes are buffered when the database server is shut down. Configuring Change Buffering When INSERT, UPDATE, and DELETE operations are performed on a table, the values of ...
https://dev.mysql.com/doc/refman/8.0/en/nested-loop-joins.html
MySQL executes joins between tables using a nested-loop algorithm or variations on it. Nested-Loop Join Algorithm Block Nested-Loop Join Algorithm Nested-Loop Join Algorithm A simple nested-loop join (NLJ) algorithm reads rows from the first table ...For example, if 10 rows are read into a buffer and the buffer is passed to the next inner loop, each row read in the inner loop can be compared against all 10 rows in the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema.html
Event collection provides access to information about synchronization calls (such as for mutexes) file and table I/O, table locks, and so forth for the server and for several storage engines. Performance Schema tables are considered local to the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-rbr-safe-unsafe.html
Trigger or stored program updates a table having an AUTO_INCREMENT column. In addition, an INSERT into a table that has a composite primary key containing an AUTO_INCREMENT column that is not the first column of this composite key is unsafe. ON ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-elements.html
Prior to MySQL 8.0.14, the monitoring tables are INFORMATION_SCHEMA tables; see Section 28.5, “INFORMATION_SCHEMA Thread Pool Tables”. The INFORMATION_SCHEMA tables now are deprecated; expect them to be removed in a future version of MySQL. For ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-hashicorp-plugin.html
The following instructions describe how to create the certificate and key files using OpenSSL. (Optional) To check key file content and validity, use the following commands: openssl rsa -in company.key -check openssl rsa -in vault.key -check Create ... Note The keyring_hashicorp plugin is an extension included in MySQL Enterprise Edition, a commercial ...
https://dev.mysql.com/doc/refman/8.0/en/multifactor-authentication.html
Table 8.11 Example authentication_policy Values authentication_policy Value Effective Policy '*' Permit only creating or altering accounts with one factor. Authentication involves one party establishing its identity to the satisfaction of a second ...Multifactor authentication (MFA) is the use of multiple authentication values (or “factors”) during the authentication ...
https://dev.mysql.com/doc/refman/8.0/en/aggregate-functions.html
For a faster count, create a counter table and let your application update it according to the inserts and deletes it does. InnoDB does not keep an internal count of rows in a table because concurrent transactions might “see” different numbers ... This section describes aggregate functions that operate on sets of ...