What is DDL transaction?
That is a DDL statement.
In SQL, there’s a lot of DDL operations you can do, such as creating a table, renaming a table, creating or removing a column, converting a column to a new type, etc.
Those DDL statements are commonly used in two cases: When creating your database’ tables for the first time..
Can DDL be rolled back?
Some statements cannot be rolled back. In general, these include data definition language (DDL) statements, such as those that create or drop databases, those that create, drop, or alter tables or stored routines. You should design your transactions not to include such statements.
What are DDL commands in MySQL?
DDL includes commands such as CREATE, ALTER, and DROP statements. DDL are used to CREATE, ALTER, OR DROP the database objects (Table, Views, Users). Data Definition Language (DDL) is used in different statements : CREATE – to create objects in the database.
Is commit required for DDL statements?
No, it will always commit. If you want to rollback, you’ll have to do it before the DDL. If you want to isolate the DDL from your existing transaction, then you will have to execute it in its’ own, separate transaction. Technically DDL does a commit BEFORE it executes and AFTER it executes.
Who uses DDL?
Stands for “Data Definition Language.” A DDL is a language used to define data structures and modify data. For example, DDL commands can be used to add, remove, or modify tables within in a database. DDLs used in database applications are considered a subset of SQL, the Structured Query Language.
Why do we use DDL?
Data definition language. DDL statements are used to build and modify the structure of your tables and other objects in the database. … The alter table statement may be used as you have seen to specify primary and foreign key constraints, as well as to make other modifications to the table structure.