Exclusive locks (X locks) are a common cause of stalled transactions, SQL timeouts, and blocked writes in GBase 8s. When a session holds an X lock on a table, no other session can insert, update, or delete rows. Here's a step‑by‑step workflow to identify and resolve the blockage. 1. Symptoms DML operations hang and eventually time out. The monitoring layer shows heavy lock contention on a particular table. One or more sessions hold unreleased X locks, blocking business tables from being written to. 2. Locate the X‑Lock Session via System Table The syslocks table records every lock in the database. Query it to find who is holding an exclusive lock on a given table. SELECT s . owner , -- session ID holding the lock s . hex ( rowidlk ) rowid -- row ID locked FROM syslocks s WHERE dbsname = 'car3gdb' -- database name AND tabname = 'prpcmain' -- table name AND type = 'X' ; -- X = exclusive lock Enter fullscreen mode Exit fullscreen mode owner is the key piece needed to release the lock.…