MySQL THE MYSQL DATABASE MYSQL In the vast realm of database management, a hidden treasure trove of information lies beneath the surface - a treasure known as metadata. What is metadata in a database, you might wonder, and why is it considered the backbone of effective data management? In...
Group Replication recovery metadata. Group Replication recovery no longer depends on writing of view change events to the binary log to mark changes in group membership; instead, when all members of a group are MySQL version 8.3.0 or later, members share compressed recovery metadata, and no su...
A table created in NDB 7.6 and earlier contains metadata in the form of a compressed .frm file, which is no longer supported in MySQL 8.0. To facilitate online upgrades to NDB 8.0, NDB performs on-the-fly translation of this metadata and writes it into the MySQL Server's data dictionary...
| memory/performance_schema/metadata_locks | 3 | 1.50 MiB | 512.00 KiB | 3 | 1.50 MiB | 512.00 KiB | | memory/innodb/trx0trx | 4899 | 1.35 MiB | 288 bytes | 4899 | 1.35 MiB | 288 bytes | | memory/performance_schema/table_lock_waits_summary_by_table | 1 | 1.34 MiB | 1.3...
MySQL 8.0 deliversNOWAITandSKIP LOCKEDalternatives in the SQL locking clause. Normally, when a row is locked due to anUPDATEor aSELECT ... FOR UPDATE, any other transaction will have to wait to access that locked row. In some use cases there is a need to either return immediately if a...
Improvements toINFORMATION_SCHEMA.MySQL 5.1 provides much more information in its metadata database than was available in MySQL 5.0. New tables in theINFORMATION_SCHEMAdatabase includeFILES,EVENTS,PARTITIONS,PROCESSLIST,ENGINES, andPLUGINS. XML functions with XPath support.ExtractValue()returns the content...
INFORMATION_SCHEMA is schema with a set of standard views/tables (depending on specific database engine) providing access to the database metadata and data dictionary - list tables, views, columns, stored procedures or functions in a database. This standard is part of SQL-92 and was ...
The non-materialized virtual columns were designed in such way that they are not present in actual InnoDB index records, but their metadata is registered with InnoDB system tables and metadata caches. Virtual columns provide flexibility and space savings for the table, and more importantly, adding/...
Learn more about the GIPK mode: Generated Invisible Primary Keys and Invisible Column Metadata.July 2023Autoscale IOPS in Azure Database for MySQL Flexible Server (General Availability) You can now scale IOPS on demand without having to pre-provision a certain amount of IOPS. With this feature...
MySQL 8.0 deliversNOWAITandSKIP LOCKEDalternatives in the SQL locking clause. Normally, when a row is locked due to anUPDATEor aSELECT ... FOR UPDATE, any other transaction will have to wait to access that locked row. In some use cases there is a need to either return immediately if a...