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https://dev.mysql.com/doc/refman/8.0/en/extensions-to-ansi.html
The KEY_BLOCK_SIZE clause in the following comment is executed only by servers from MySQL 5.1.10 or higher: CREATE TABLE t1(a INT, KEY (a)) /*!50110 KEY_BLOCK_SIZE=1024 */; The following descriptions list MySQL extensions, organized by category. Be ... MySQL Server supports some extensions that you are not likely to find in other SQL ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlock-example.html
Client A enables innodb_print_all_deadlocks, creates two tables, 'Animals' and 'Birds', and inserts data into each. The following example illustrates how an error can occur when a lock request causes a deadlock. Thererfore, the previous read-only ...
https://dev.mysql.com/doc/refman/8.0/en/plugin-loading.html
For example, if the plugin implements a storage engine, existing tables for the storage engine become inaccessible, and attempts to create new tables for the storage engine result in tables that use the default storage engine unless the ...Built-in ... Server plugins must be loaded into the server before they can be ...
https://dev.mysql.com/doc/refman/8.0/en/compressed-format.html
Compressed tables have the following characteristics: Compressed tables take very little disk space. The header for a row takes up one to three bytes depending on the biggest row in the table. Note While a compressed table is read only, and you ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-delete-all.html
In some cases, this can be much faster than DELETE or even TRUNCATE TABLE. Usage ndb_delete_all -c connection_string tbl_name -d db_name This deletes all rows from the table named tbl_name in the database named db_name. Options that can be used with ...--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving ...
https://dev.mysql.com/doc/refman/8.0/en/ndb-restore-to-different-version.html
Tables created in NDB 8.0 by default use the utf8mb4_ai_ci character set, which is not available in NDB 7.6 and earlier, and so cannot be read by an ndb_restore binary from one of these earlier versions. Due to changes in how the MySQL Server and ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-pruning.html
By limiting the search, it is possible to expend much less time and effort in finding matching rows than by scanning all partitions in the table. When the optimizer can make use of partition pruning in performing this query, execution of the query ... The optimization known as partition pruning is based on a relatively simple concept which can be described as “Do not scan partitions where there can be no matching ...
https://dev.mysql.com/doc/refman/8.0/en/federated-description.html
When you create a table using one of the standard storage engines (such as MyISAM, CSV or InnoDB), the table consists of the table definition and the associated data. When you create a FEDERATED table, the table definition is the same, but the ...A ...The statement is sent to the remote server using the MySQL client ...
https://dev.mysql.com/doc/refman/8.0/en/nested-join-optimization.html
The syntax of table_factor is extended in comparison with the SQL Standard. The latter accepts only table_reference, not a list of them inside a pair of parentheses. This is a conservative extension if we consider each comma in a list of ...The ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ps-tables.html
Thread names are shown in the name column of the threads and setup_threads tables using the format prefix/plugin_name/thread_name. Using the thread ID or OS thread ID for a given thread in the threads or setup_threads table, it is possible to obtain ... NDB 8.0 provides information in the MySQL Performance Schema about threads and transaction memory usage; NDB 8.0.29 adds ndbcluster plugin threads, and NDB 8.0.30 adds instrumenting for transaction batch ...