PostGresSQL-6.4 backend killed connection to PSQL

Your name        :    Torsten Knodt
Your email address    :    torstenknodt@memoryalpha.rhein-main.de


System Configuration
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  Architecture (example: Intel Pentium)      : P54C-200, 128MB

  Operating System (example: Linux 2.0.26 ELF)     : Linux 2.0.36 ELF

  PostgreSQL version (example: PostgreSQL-6.4)  :   PostgreSQL-6.4

  Compiler used (example:  gcc 2.8.0)        : gcc 2.7.2.3


Please enter a FULL description of your problem:
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PSQL looses backend connection with select in pqReadData.

Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible:
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I've appended a party dump of the database without data.
The table "Adressen" had 7000 entries.
I've used the following command:
SELECT A.* FROM "Adressen" A, Doppelt_Name_Strase D WHERE
(A."Name"=D."Name") AND (A."Strasse"=D."Strasse");

If you know how this problem might be fixed, list the solution below:
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Sorry, no solution.