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SingleStoreDB v8.1

Database Level Locks

  • A database level lock is taken on the database that the operation is operating on. While an operation holds a database level lock, no other operation that requires the same lock can operate on that database.

  • A database level lock can be taken concurrently with locks on other databases in the same cluster. For example, two ALTERs can run simultaneously on two different databases.

  • If a database level lock is taken, it will block a cluster lock from being taken.

  • DML operations are not affected by these locks.

  • DDL operations that are affected by these locks are listed in Operations that Take Database Level Locks.

  • Any blocked operations will queue.

Example: Database a takes a shared lock to perform CREATE DATABASE. Database b takes a shared lock to perform BACKUP DATABASE concurrently.

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