How many locking systems are there in JDBC?

You can lock a record, a group of records, a database table, a tablespace, etc., and when we do this, we cannot change the locked value. The following are the types of locks in JDBC:

• Row locks and key locks: They are used to lock specific rows. Using these locks you can achieve concurrency.

• Page Lock: These are used to lock pages. If you apply this feature, whenever the contents of a row change, the database locks the entire page that holds the row. You can use this lock if you need to update/change a large number of rows at once.

• Table Locks: You can use these locks. There are two types of table locks. Shared and exclusive.

• Database lock: This will lock the entire database. You can use this lock to prevent transactions from other databases from accessing the current database.

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