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How to determine if there are database locks in the current running transaction and if so which transaction ID is it?

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{answer}The following query result indicates whether there is a lock or not:

The following query result indicates whether there is a lock or not:

In case there is at least one lock, the result includes the transaction ID (BLOCKEDBY ), for example:

SQL> select * from system.transactions where blockedby <> -1;
ID STATE NODEID BLOCKEDBY STARTEVENT ENDEVENT SEQUENCE ISOLATIONLEVEL ISUPDATE DEADLOCKVICTIM COMMITPROTOCOL QUEUE SOURCENODE
------------ ------ ------- ------------ ----------- --------- --------- --------------- --------- --------------- --------------- ------ -----------
106531156226 Active 2 106532232324 1483 <null> -1 8 TRUE FALSE local Active 4
106531156226 Active 2 106532232324 1511 <null> -1 8 TRUE FALSE local Active 2

More information and examples can be found here.

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