CODEWITHSUNDEEP
c#vb.netsql-server-celocal-database
Frank_Vr
Frank_Vr

Reputation: 659

SQL Server CE slow at reading (36 seconds for 1000 rows?)

I have a table PartNumbers with 10 columns with mixed data types and just over 100,000 rows.

Here is my test:

I've put an index on the ID column:

CREATE UNIQUE INDEX IndexName ON [PartNumbers] (ID)

I get a list of 1000 randomly selected ID's (Random_ID_List) and loop through each ID to fetch the description from the table:

 Dim Stop_Watch As New Stopwatch
  Stop_Watch.Start()

  Dim Results As New List(Of String)
  LocalDB.SQLCe_Connection.Open()
  For Each ID As Integer In Random_ID_List
   Dim sqlcmd = LocalDB.SQLCe_Connection.CreateCommand()
   sqlcmd.CommandText = "SELECT Description FROM PartNumbers WHERE ID = " & ID
   Results.Add(sqlcmd.ExecuteScalar)
  Next
  LocalDB.SQLCe_Connection.Close()

  Stop_Watch.Stop()
  Dim Result_Time As Long = Stop_Watch.ElapsedMilliseconds

My result is:

Is this normal?

Upvotes: 1

Views: 248

Answers (1)

Jonathan Allen
Jonathan Allen

Reputation: 70327

Use a parameterized query.

sqlcmd.CommandText = "SELECT Description FROM PartNumbers WHERE ID = @Param";
sqlcmd.Parameters.AddWithValue("@Param", ID);

I don't know the details for this database, but for other databases you can spend more time parsing the SQL and generating the execution plan than actually running the query.

Upvotes: 3

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