Does Start transaction lock table?
If you were to add BEGIN TRANSACTION (or BEGIN TRAN) before the statement it automatically makes the transaction explicit and holds a lock on the table until the transaction is either committed or rolled back..
Does SQL update lock table?
If a SQL Server process begins a search operation with the intention of eventually modifying data, it acquires UPDATE locks until it finds the data to modify. UPDATE locks are compatible with SHARED locks, but are not compatible with EXCLUSIVE locks or other UPDATE locks.
What is table lock in SQL?
The LOCK TABLE statement allows you to explicitly acquire a shared or exclusive table lock on the specified table. The table lock lasts until the end of the current transaction. To lock a table, you must either be the database owner or the table owner.
What Cannot be done on a view?
What cannot be done on a view? Explanation: In MySQL, ‘Views’ act as virtual tables. It is not possible to create indexes on a view. However, they can be used for the views that are processed using the merge algorithm.
Can we rollback after commit?
A transaction is a sequence of SQL statements that Oracle Database treats as a single unit. … After you commit the transaction, the changes are visible to other users’ statements that execute after the commit. You can roll back (undo) any changes made during the transaction with the ROLLBACK statement (see ROLLBACK.