Re: PQgetlength vs. octet_length() - Mailing list pgsql-hackers

Hello everyone.

Having a weird issue.

I have a value inserted into a bytea column, which is about 137megs in size.

If I use octet_length() to check the size of the column for this specific row I get this:

TestDB=# SELECT octet_length(rawdata) FROM LargeData;

 octet_length 

--------------

    143721188

When fetching the row through the C API, and I use PQgetlength() on the column of the row in question I get:

(gdb) p (int)PQgetlength(result, rowIndex, i)

$3 = 544453159

I am wondering if I am lacking knowledge that explains why these values are different, or if something fishy is going on.

What led me to investigating this is that fetching this row in a C application is causing a failure.  My programs memory usage balloons to 1.3 gigs after executing this:

const char *valC = PQgetvalue(result, rowIndex, i);

Am I doing something wrong, or is there some ideas what I should investigate next?

This seems quite puzzling to me.

Thanks in advance for any help/insight offered,

Michael.