TIA for your help.
I am using an OleDbTransaction in `ASP.net`, Page Language="vb", the database is SQL Server 2008 R2 Express. I get a "query timeout expired", and the transaction is rolled back, then the webpage user has to try again, and usually it succeeds. Is it a race condition that is causing this?
Inside the transaction there are Inserts on 12+ tables, Updates on 3+ tables, and 7+ Selects. The Selects are generally used to get the IDENTITY ID of the Insert that just happened. The query timeout always happens on one specific Insert in the middle of the transaction. The table is one of our busiest. The time taken up until that Insert is generally 1/100th of a second.
Does an insert inside of an OleDbTransaction place a lock on the last page of the table? So that another user trying to insert will get the timeout? It is possible that two different users are getting the same PublicID (see below code) and trying to use it. There is a UNIQUE index on tblContracts.PublicID.
Is it something to do with my insert being too slow because of my indexes being wrong for that table?
More detail. The series of events looks something like
Sub ConvertAppCall(ByRef udtErrorReport As ErrorReport)
Dim conDB As OleDbConnection
Dim traDB As OleDbTransaction
Dim cmdDB As OleDbCommand
Dim prmDB As OleDbParameter
Dim drdDB As OleDbDataReader
conDB = New OleDbConnection(ConfigurationSettings.AppSettings("MDB"))
conDB.Open()
traDB = conDB.BeginTransaction()
Try
...inserts/selects...
then the statements with a ** are inside a utilities file, having passed the OleDbConnection and OleDbTransaction
**SELECT TOP 1 PublicId FROM tblContracts ORDER BY PublicId DESC
**then use OleDbDataReader to read the PublicID and add 1 to it, then
**UPDATE [tblLasts] SET LastPublicId = " & lngPublicId
then back on the main page, immediately do this
INSERT INTO [tblContracts] (using the lngPublicID)
cmdDB = New OleDbCommand(strSQL, conDB)
prmDB = New OleDbParameter
prmDB.ParameterName = "ContractNotes"
prmDB.Value = IIf(txtContractNotes.Text.Length > 0, txtContractNotes.Text, System.DBNull.Value)
prmDB.DbType = System.Data.DbType.[String]
cmdDB.Parameters.Add(prmDB)
cmdDB.Transaction = traDB
cmdDB.ExecuteNonQuery
and if any query timeout happens, it happens here
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