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SQL refers to Structured Query Language, a kind of language used to access, update and manipulate database. In SQL, ROLLBACK is a command that causes all data changes since the last START TRANSACTION or BEGIN to be discarded by the relational database management systems (RDBMS), so that the state of the data is "rolled back" to the way it was before those changes were made.
A command-line interface is a means of interacting with a computer program where the user issues commands to the program by typing in successive lines of text (command lines). MySQL ships with many command line tools, from which the main interface is the mysql client. [125] [126]
Commonly used to back up MySQL; Archive Backup Client for OpenVMS - A product by STORServer Inc. to back up OpenVMS systems into TSM. With ABC you can back up, archive, restore, query and manage OpenVMS files stored on TSM servers as a logical extension to the on-line OpenVMS ODS-2 or ODS-5 file systems.
In information technology, a backup, or data backup is a copy of computer data taken and stored elsewhere so that it may be used to restore the original after a data loss event. The verb form, referring to the process of doing so, is " back up ", whereas the noun and adjective form is " backup ". [ 1 ]
If a table contains big variable-length columns (BLOB or TEXT) it cannot use the FIXED format. DYNAMIC: Variable-length columns do not have a fixed length size. This format is a bit slower to read but saves some space on disk. COMPRESSED: Compressed tables can be created with a dedicated tool while MySQL is not running, and they are read-only.
Bacula supports Linux, UNIX, Windows, and macOS backup clients, and a range of professional backup devices including tape libraries. Administrators and operators can configure the system via a command line, GUI or web interface; its back-end is a catalog of information stored by MySQL, PostgreSQL, or SQLite.
It can be used as a source of the information that some databases make available through non-standard commands, such as: the SHOW command of MySQL; the DESCRIBE command of Oracle's SQL*Plus; the \d command in psql (PostgreSQL's default command-line program).
Data Control Language is one of the logical group in SQL Commands. SQL [ 1 ] is the standard language for relational database management systems. SQL statements are used to perform tasks such as insert data to a database, delete or update data in a database, or retrieve data from a database.