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Im migrating an application from oracle to postgresql. In one of the functions that I already migrated I copy data from a different oracle db (db link in oracle, oracle_fdw extension in postgresql) from a few tables into a local table in my postgresql db. However, I`m getting the next error :

invalid byte sequence for encoding "UTF8": 0x00

I saw that some people had this kind of issue in this forum but they didnt try to copy the data directly from a remote database (they loaded data from a dump or from a csv..).

Some kind of idea what can I do ?

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  • What is the Oracle DB encoding? Commented Jul 24, 2017 at 12:06
  • nls_characterset : IW8ISO8859P8 Commented Jul 24, 2017 at 12:13

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PostgreSQL does not allow the “zero” character in character strings.

You'll have to sanitize the Oracle data before you can retrieve them from PostgreSQL.

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What does it mean "Zero" character ? How can I filter the data before it comes to postgresql ? I run in postgresql the query insert into local_table select * from remote_table
With "zero character" I mean the character with ASCII (or UNICODE) code point 0. Ther error is thrown during the select from remote_table - some string column there contains such a character. You'll have to fix the data on the Oracle side.
I think that those just varchar columns that dont have any value - the null of varchar. So what exactly do I need to change ?
No, a NULL value would not be a problem. If you select the offending value like this in Oracle: SELECT dump(badcol, 16) FROM atable WHERE id = 42 you will see a byte 0x00 somewhere in there. That is the problem (replace badcol, atable, id and 42 with relevant values for your situation).
The error I got in postgresql doesnt specify which row has the problem - only the table_name and the column. How can I proceed from here ? for exmaple : insert into MANUIM select * from MANUIM_prod; ERROR: invalid byte sequence for encoding "UTF8": 0x00 CONTEXT: converting column "street" for foreign table scan of "manuim_prod", row 922311
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Now it works with oracle_fdw 2.3.+ Here is code I used

select 'ALTER FOREIGN TABLE "'||table_schema||'"."'||table_name||'" ALTER COLUMN "'||column_name||'"  OPTIONS (ADD strip_zeros ''true'');' 
from information_schema."columns" c 
where table_name ='my_foreign_table_name'
and table_schema ='my_schema_name_where_foreign_table_created'
and udt_name in ('varchar', 'bpchar');
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