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I'm using Postgres 9.1 on Debian Lenny and via a Java server (JBoss AS 6.1) I'm executing a simple "select ... for update" query:
SELECT importing FROM customer WHERE id = :customer_id FOR UPDATE NOWAIT Once every 10 to 20 times Postgres fails to obtain the lock for no apparent reason: 18:22:18,285 WARN [org.hibernate.util. 18:22:18,285 ERROR [org.hibernate.util. I'm "pretty" sure there's really no other process that has the lock, as I'm the only one on a test DB. If I execute the query immediately again, it does succeed in obtaining the lock. I can however not reproduce this via e.g. PGAdmin. Is it possible or perhaps even known that PG has this behavior, or should I look for the cause in the Java code? (I'm using Java EE"s entity manager to execute a native query inside an EJB bean that lets a JDBC connection from a pool join a JTA transaction.) Thanks! |
