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Query´s to an older FB1.5-Server causes SQLDA-error [DNET846] #779

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firebird-issue-importer opened this issue Aug 29, 2018 · 12 comments
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@firebird-issue-importer

Submitted by: Andreas Franz (andyfx12)

Sometimes (not reproducible) I get an non-specific "SQLDA"-error, if a simple query is send to an FB1.5 server. On server-side, there´s an error 10054 in logfile.
I can´t update to a newer Firebird-server version because of an older expensive special software with BDE-access.
Older providers (I guess <4.5) didn´t have this problem. I have updated provider to 6.2, because of an additional FB2.5-server I have to connect, too (in same application).
Is FB1.5 incompatible with newer providers? Are there any examples for detailled error-handling?

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@firebird-issue-importer firebird-issue-importer commented Aug 29, 2018

Commented by: @cincuranet

The communication is (or at least should be) backward compatible. But unless you can somewhat reliably reproduce it, I'm afraid I can't do much.

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@firebird-issue-importer firebird-issue-importer commented Aug 29, 2018

Commented by: Andreas Franz (andyfx12)

Thanks for your reply.

At the moment my "error-handling" is:
- closing the connection
- disposing the connection
- clear-all-pools
- opening a new connection
- fire the query again

It works - but it´s not really "clean". Any chance to get more specific error-message?

My query in real application looks like

select * from kunden where kundennr in (select kundennr from anlagen where anlagennr in (select anlagennr from wartauft where erledigt='0')) order by kundennr

I´ve disabled pooling - error occurs less often, but it occurs.

I´ve tested to reproduce with a "dirty" stress-test code:

- open a connection
- fire a query with a random ID from an entry
- read result
- close the connection
- repeat this for 100000 times
- start this program multiple times on server-machine (to prevent any network problems)

Sometimes error occurs nearly at once - sometimes it takes hours and need multiple restarts.

regards, Andy

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@firebird-issue-importer firebird-issue-importer commented Aug 29, 2018

Commented by: @cincuranet

Please share the complete exception (ex.ToString() is enough for start).

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@firebird-issue-importer firebird-issue-importer commented Aug 29, 2018

Commented by: Andreas Franz (andyfx12)

OK - I´ve modified my code from "ex.message" to "ex.tostring"

I´ll post the results.

Thanks a lot for your support!

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@firebird-issue-importer firebird-issue-importer commented Aug 29, 2018

Modified by: @cincuranet

status: Open [ 1 ] => In Progress [ 3 ]

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@firebird-issue-importer firebird-issue-importer commented Sep 2, 2018

Commented by: Andreas Franz (andyfx12)

Hallo Jiri,

after compiling my "Stresstest.exe" with your 6.2.0.0debug-Version I´ve found a bug in my code (because errors in firebird.log exists).
My code had closed "mydatareader" - indepent if my query has a result or not.
Closing a reader without result throws another exeption on FB1.5 server. I´ve fixed my bug - and even after 6000000 random queries with 6 parallel connections no error is occured.

I changed my code in productive tool, too - there´s no error since 3 days.

So I think my problem is gone - but if not, I´ll come back.

Thanks for your amazing work!

regards,

Andy

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@firebird-issue-importer firebird-issue-importer commented Sep 2, 2018

Modified by: @cincuranet

status: In Progress [ 3 ] => Resolved [ 5 ]

resolution: Cannot Reproduce [ 5 ]

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@firebird-issue-importer firebird-issue-importer commented Sep 3, 2018

Commented by: Andreas Franz (andyfx12)

Hallo Jiri,,

now I´ve got an errormessage:

03.09.2018 04:44:43;FirebirdSql.Data.FirebirdClient.FbException (0x80004005): SQLDA error ---> SQLDA error
bei FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteReader(CommandBehavior behavior)
bei Stresstest.Datenbank.query(String mySelectQuery) in C:\Users\andreas.franz.STFRANZ\Documents\SharpDevelop Projects\Stresstest\Stresstest\Datenbank.vb:Zeile 48.;Microsoft.VisualBasic.ErrObject;DB;Stresstest

Line 48 shows:

myreader=myCommand.ExecuteReader(CommandBehavior.CloseConnection)

I´ve removed CommandBehavior.CloseConnection now - another test is in progress ....

regards,

Andy

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@firebird-issue-importer firebird-issue-importer commented Sep 5, 2018

Modified by: @cincuranet

status: Resolved [ 5 ] => Reopened [ 4 ]

resolution: Cannot Reproduce [ 5 ] =>

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@firebird-issue-importer firebird-issue-importer commented Oct 5, 2018

Commented by: @cincuranet

No further communication so far. Will reopen if somebody provides a reproducible test case.

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@firebird-issue-importer firebird-issue-importer commented Oct 5, 2018

Modified by: @cincuranet

status: Reopened [ 4 ] => Closed [ 6 ]

resolution: Cannot Reproduce [ 5 ]

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@firebird-issue-importer firebird-issue-importer commented Oct 28, 2018

Commented by: Andreas Franz (andyfx12)

Hallo Jiri,

since 6.3.0.0 no single error occured. Seems my problem is gone.

Thanks a lot!

regards,

Andy

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