The following bug has been logged online:

Bug reference: 2206
Logged by: RIMBAUD Christophe
Email address: christophe.rimbaud (AT) bull (DOT) net
PostgreSQL version: 8.1.2
Operating system: Linux Rh3 IA 64
Description: error on declare cursor after a close cursor
Details:

error when i declare a cursor after closing it .
In psql 7.2 it's OK but not in 8.
exemple :

corio=# begin ;
DEBUG: StartTransactionCommand
DEBUG: StartTransaction
DEBUG: name: unnamed; blockState: DEFAULT; state: INPROGR,
xid/subid/cid: 50052/1/0, nestlvl: 1, children: <>
DEBUG: ProcessUtility
DEBUG: CommitTransactionCommand
BEGIN
corio=# close PRUTCURSNOLOCK;
DEBUG: StartTransactionCommand
DEBUG: ProcessUtility
ERROR: cursor "prutcursnolock" does not exist
corio=# declare PRUTCURSNOLOCK cursor for select * from PRUT where
UTILCOD >= 'ADMIN ' and PRUTCOLLCOD >= ' ' and SECUMDP >= '
';
DEBUG: StartTransactionCommand
ERROR: current transaction is aborted, commands ignored until end of
transaction block
corio=#

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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

"RIMBAUD Christophe" <christophe.rimbaud (AT) bull (DOT) net> writes:
This is an intentional change. Sorry; you're going to have to fix your
application to not do that.

regards, tom lane

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TIP 2: Don't 'kill -9' the postmaster