# Quiz

+ 2) The following SQL blocking queries for TiDB databases are incorrect?
  + A. `DEADLOCKS`  The table stores 10 deadlock information by default
  + B. `TIDB_TRX`  Query of tables requires PROCESS privilege
  + C. `DATA_LOCK_WAITS`  Record blocking information only in completed transaction
  + D. `DATA_LOCK_WAITS`  The record is pessimistic lock information

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C