Message-ID: <cf4966960fa6b5511535d5bc6ff4bf6c405b6d4e.camel@cybertec.at>
Subject: Re: PostgreSQL JDBC Driver ERROR: invalid byte sequence for
 encoding "UTF8": 0x00 on Select stmt
From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Hotmail <crajac66@hotmail.com>, Pgsql-admin
	 <pgsql-admin@lists.postgresql.org>
Date: Tue, 11 Aug 2020 10:33:05 +0200
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References: <33086f4b-dacc-466e-a085-830b62cdd18a@Spark>
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On Sat, 2020-08-08 at 03:59 -0600, Hotmail wrote:
> We migrated data from Oracle to postgres using oracle_fdw without seeing any invalid byte
>  sequence for encoding "UTF8": 0x00 errors. The data transfer from Oracle to Postgres using
>  oracle_fdw completed successfully without any errors.
> 
> After we started our application using Postgres as the new data source we are consistently
>  seeing "invalid byte sequence for encoding "UTF8": 0x00 errors" once or twice a minute on
>  a basic select statement like this:
> 
> Select * from <table> where <col1>=‘foo’ and <col2>=‘foo2’;
> 
> Not all queries fail just some. We can select * from the table in question from psql without
>  any invalid byte sequence errors (A problem with the jdbc client maybe?)

oracle_fdw will complain about zero bytes, so odds are that your PostgreSQL database is fine.
This is confirmed by the face that "SELECT * FROM atable" works in PostgreSQL.

I can see two options:

1. The statement that causes the errors is actually a different statement, for
   example an INSERT.

2. 'foo' and 'foo2' contain zero bytes.

Yours,
Laurenz Albe