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Classics Forum

Re: Controlling the cursor buffer in ESQL/C

Posted By: Art Kagel
Date: Friday, 15 July 2016, at 9:14 a.m.

In Response To: Controlling the cursor buffer in ESQL/C (FLORIAN APOLLONER)


The environment variable FET_BUF_SIZE sets the size of the fetch/insert
buffer at runtime. The default buffer size is 4096 bytes the range is 4,096
- 2,147,483,648 since CSDK version 3.50. Prior to that the range was 4,096
- 65,535.

There is also a global variable. FetBufSize, that you can use, however its
range is only the older 4,096 - 65,535 range.

Finally, if you include the login.h header file you have access to the
iNetLogin structure which has a field, FetBuffSize, that supposedly holds
the value set in the FET_BUF_SIZE environment variable. However, it is
defined as char(6) so it seems that this field can only hold values up to

So, for access to the full available range of the buffer sizes you can only
use the runtime environment variable, FET_BUF_SIZE, to set it. Your code
has to be dynamic enough to read that at runtime and allocate sufficiently
large buffers if you are using Array Fetching (ie setting the global
variable FetchArray to the number of rows to fetch in a single operation).
If you are not using array fetching the ESQL/C library will handle sizing
the actual fetch buffer for you using the environment setting (even works
in dbaccess and myexport/myimport BTW).

FYI: due to a bug I reported several years ato that's never been fixed, you
cannot use Array Fetching for any SELECT that returns an LVARCHAR column.
Attempting to do so returns a spurious error about not being able to use
Array Fetching with Delayed Prepare.


Art S. Kagel, President and Principal Consultant
ASK Database Management


Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do
those opinions reflect those of other individuals affiliated with any
entity with which I am affiliated nor those of the entities themselves.

On Fri, Jul 15, 2016 at 8:39 AM, FLORIAN APOLLONER <
> wrote:

> Hi,
> I've been reading
> and the supage about the cursor buffer -- but I cannot find out how to
> control
> the size of the cursor buffer for selects. Do you have any pointers for me?
> Thanks,
> Florian
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.


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