Database transaction: When a transaction is actively manipulating data in a table, the table will be locked to ensure the consistency and integrity of the data.
Concurrent operations: When multiple users are trying to read or write to the same table at the same time, there may be conflicts with locks, resulting in the table being locked.
Index operations: When maintaining, rebuilding, or reorganizing indexes on a table, the table is locked to ensure the correctness of the index operation.
Data manipulation: When making extensive changes to data in a table, such as inserting, updating, or deleting, the table will be locked to prevent other operations from causing data inconsistency.
Deadlock: When multiple transactions are involved in a deadlock, it results in the table being locked until the deadlock is resolved.