marcelo Cortez wrote:
Hi Richard , folks

the query is:

 SELECT c.actuacion_car AS c_actuacion,
 c.comentario1 || ' ' || c.comentario2 || ' ' ||
c.comentario3 AS c_comentario FROM caratult AS c INNER JOIN extractt AS t1 ON
...etc


I'm not seeing anything here that should take locks, although it's late where I am.

without table definition etc, you see are selects
only.
during this query, select * from pg_catalog.pg_locks show many rows with exclusive locks , and other
activities or user's be freezed,

Are you *sure* that it's this query? Could you show some of the rows from pg_locks along with corresponding rows from pg_stat_activity?

--
  Richard Huxton
  Archonet Ltd

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