I wrote > Anyway, the problem are the no. of semaphores created by Postgres: > Every backend creates at least 4*<max_connections> semaphores.
Sorry, this must read <max_connections> semaphores, not 4 times.
Rainer
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
