My PG server came to a screeching halt yesterday. Looking at top saw a very
large number of "startup waiting" tasks. A pg_dump was running and one of my
scripts had issued a CREATE DATABASE command. It looks like the CREATE DATABASE
was exclusive but was having to wait for the pg_dump to finish, causing a
massive traffic jam of locks behind it.
Once I killed the pg_dump process, things returned to normal.
Version 8.0.12. Is this a bug? It also concerns me because my workload is
likely to expose this problem again.
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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
