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Timeout MSSqlServer 2005 from VB6 during Open Table

Posted on 2008-06-13
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Last Modified: 2011-09-20
Hallo Experts,
My Vb6 Application tries to open a Table to add new records to this table.
Mostly during system backup time i get this message:
"Abfragetimeout abgelaufen (-2147217871)" (meaning something like "retrieval timeou") after 30 s.
I did not found a means to change this timeout (oconn.CommandTimeout = 120 did not work)
Any suggestion?
Josef
Dim oConn As ADODB.Connection

  Dim rst1 As ADODB.Recordset
 

  Set oConn = New ADODB.Connection

  With oConn

    .Provider = sProvider

    .Properties("Data Source") = sDataSource

    .Properties("User ID") = sUserID

    .Properties("Password") = sPassword

    .Properties("Initial Catalog") = sInitialCatalog

    .CursorLocation = adUseClient

'    .ConnectionTimeout = 120 'no difference

'    .CommandTimeout = 120    'no difference

    .Open

  End With 'oConn
 

  Set rst1 = New ADODB.Recordset

  rst1.CursorType = adOpenKeyset

  rst1.LockType = adLockBatchOptimistic
 

  rst1.Open "Messwerte", oConn.ConnectionString, , , adCmdTable
 

'here the timeout occurs

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Question by:joschramm
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Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
Comment Utility
change:
  rst1.Open "Messwerte", oConn.ConnectionString, , , adCmdTable

into:
  rst1.Open "select * from Messwerte where 1=0 ", oConn.ConnectionString

this will return 0 records, be very fast, and still allow you to add new records.

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Author Comment

by:joschramm
Comment Utility
Many thanks, Angelllll.
i tested your solution  "at home" - seems to work fine (but   h e r e  i get no timeouts at all, of course). Now i sent the application "into the field" and tomorrow i will know more.

You will hear from me,
hpefully josef
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Author Closing Comment

by:joschramm
Comment Utility
responsetime is down from 15 s to 2 s (mean time during duty hours) respectively from far more then 30 s to 10 s (during backup time). But what magic is here at work? Due to the textbook you have to open the table then add a record.
How comes that your solution "still allow you to add new records"?
sincerly,
Josef
0
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
Comment Utility
<Grading Comments>
responsetime is down from 15 s to 2 s (mean time during duty hours) respectively from far more then 30 s to 10 s (during backup time).
But what magic is here at work? Due to the textbook you have to open the table then add a record.
How comes that your solution "still allow you to add new records"?
sincerly,
Josef
</Grading Comments>

as explained, using the select to return 0 records will avoid that the opentable will have to return ALL (yes, all) the records from the table to the client computer.
so, imagine for a table with 1 Million records, and 10 clients try to add 1 record with the original code :)

this side effect is what the text books do not explain, as it would go much too far in details for just getting the kick off how to work in general... (and maybe to give the experts the way to look good, afterwards :) )

glad it worked for you.
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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
Comment Utility
ps:
>"Abfragetimeout abgelaufen (-2147217871)" (meaning something like "retrieval timeou") after 30 s.
means command timeout has expired...

indeed, the command timeout is at default 30 seconds. you could change the command timeout from 30 to another value (ie 0 for infinite timeout), but as you might want to agree: better make the query short than the wait time long :)
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Author Comment

by:joschramm
Comment Utility
> you could change the command timeout from 30 to another value (ie 0 for infinite timeout)
but how? (If it will be necessary in other circumstances...)

nevertheless:
> but as you might want to agree: better make the query short than the wait time long :)
I do agree indeed, severe.
Thanks again for your help
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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
Comment Utility
re: command timeout:

the main problem why the "command timeout" did not work in your original code was this line:
  rst1.Open "Messwerte", oConn.ConnectionString, , , adCmdTable

you passed the connection string instead of the connection object.
  rst1.Open "Messwerte", oConn, , , adCmdTable

that differences solves:
* the connection was already open, so your original code reopened it again with the recordset
* the commandtimeout set on the connection object was not incorporated in the connectionstring returned, hence "ignored"

another way to do it is using the Command Object:
  Dim oConn As ADODB.Connection

  dim oCmd as ADODB.Command

  Dim rst1 As ADODB.Recordset

 

  Set oConn = New ADODB.Connection

  With oConn

    .Provider = sProvider

    .Properties("Data Source") = sDataSource

    .Properties("User ID") = sUserID

    .Properties("Password") = sPassword

    .Properties("Initial Catalog") = sInitialCatalog

    .CursorLocation = adUseClient

'    .ConnectionTimeout = 120 'no difference

'    .CommandTimeout = 120    'no difference

    .Open

  End With 'oConn
 

  Dim oCmd as ADODB.Command

  Set oCmd = New ADODB.Command

  Set oCmd.ActiveConnection = oConn

  oCmd.CommandTimeout = 120

  oCmd.CommandText = "select * from Messwerte where 1=0 "
 

  Set rst1 = New ADODB.Recordset

  rst1.CursorType = adOpenKeyset

  rst1.LockType = adLockBatchOptimistic

 

  rst1.Open oCmd

 

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Author Comment

by:joschramm
Comment Utility
ah, now I understand it!
very good
Josef
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