Amazon Redshift
Database Developer Guide (API Version 2012-12-01)


Returns the process ID (PID) of the server process handling the current session.


The PID is not globally unique. It can be reused over time.



Return Type

Returns an integer.


You can correlate PG_BACKEND_PID() with log tables to retrieve information for the current session. For example, the following query returns the query ID and a portion of the query text for queries executed in the current session.

select query, substring(text,1,40) from stl_querytext where pid = PG_BACKEND_PID() order by query desc; query | substring -------+------------------------------------------ 14831 | select query, substring(text,1,40) from 14827 | select query, substring(path,0,80) as pa 14826 | copy category from 's3://dw-tickit/manif 14825 | Count rows in target table 14824 | unload ('select * from category') to 's3 (5 rows)

You can correlate PG_BACKEND_PID() with the pid column in the following log tables (exceptions are noted in parentheses):

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