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https://dev.mysql.com/doc/refman/8.0/en/date-and-time-type-syntax.html
(This differs from the standard SQL default of 6, for compatibility with previous MySQL versions.) Any TIMESTAMP or DATETIME column in a table can have automatic initialization and updating properties; see Section 13.2.5, “Automatic Initialization ... The date and time data types for representing temporal values are DATE, TIME, DATETIME, TIMESTAMP, and ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-internals.html
InnoDB API for the InnoDB memcached Plugin The InnoDB memcached engine accesses InnoDB through InnoDB APIs, most of which are directly adopted from embedded InnoDB. InnoDB API functions are passed to the InnoDB memcached engine as callback ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-persistent-stats.html
row *************************** database_name: sakila table_name: actor last_update: 2014-05-28 16:16:44 n_rows: 200 clustered_index_size: 1 sum_of_other_index_sizes: 1 ...mysql> SELECT * FROM innodb_index_stats \G *************************** 1. row ... The persistent optimizer statistics feature improves plan stability by storing statistics to disk and making them persistent across server restarts so that the optimizer is more likely to make consistent choices each time for a given ...
https://dev.mysql.com/doc/refman/8.0/en/linux-installation-native.html
Note Before installing, make sure that you update your apt-get index files to ensure you are downloading the latest available version. Many Linux distributions include a version of the MySQL server, client tools, and development components in their ...
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. After ...OPTIMIZE TABLE reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-json.html
Before MySQL 8.0, an update to a JSON column was always written to the binary log as the complete document. In MySQL 8.0, it is possible to log partial updates to JSON documents (see Partial Updates of JSON Values), which is more efficient. JSON ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-locking.html
An exclusive (X) lock permits the transaction that holds the lock to update or delete a row. Transaction data for an intention lock appears similar to the following in SHOW ENGINE INNODB STATUS and InnoDB monitor output: TABLE LOCK table `test`.`t` ...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/json-modification-functions.html
JSON_ARRAY_INSERT(json_doc, path, val[, path, val] ...) Updates a JSON document, inserting into an array within the document and returning the modified document. In MySQL 8.0.4, the optimizer can perform a partial, in-place update of a JSON column ... The functions in this section modify JSON values and return the ...
https://dev.mysql.com/doc/refman/8.0/en/show-table-status.html
Even with file-per-table mode with each InnoDB table in a separate .ibd file, change buffering can delay the write to the data file, so the file modification time is different from the time of the last insert, update, or delete. Free space means the ... SHOW TABLE STATUS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLE STATUS works likes SHOW TABLES, but provides a lot of information about each non-TEMPORARY ...
https://dev.mysql.com/doc/refman/8.0/en/converting-tables-to-innodb.html
While a transaction is open, the system keeps a snapshot of the data as seen at the beginning of the transaction, which can cause substantial overhead if the system inserts, updates, and deletes millions of rows while a stray transaction keeps ...