Getting ODBC - System Resources Exceeded (Rutime error 3035) - vba

Question

Need some assistance. I took Gord Thompson's code here How to increase performance for bulk INSERTs to ODBC linked tables in Access? and modified it to fit my case.
I am trying to copy the contents of a query called 'bulk_insert' (which is based on a local table in MS Access DB) into a SQL linked table called dbo_tblCVR_Matching_tmp. The query has no calculated fields or functions or nothing, just 102 columns of plain data. I'm currently testing with files in the range of 6K to 10K records.
The code executes and it copies many records over before I get the error in the title of this thread. I have looked around, but there is nothing that would help me with my particular issue. Not sure if I have to clear or refresh something. Here is the 2 routines I'm using:
'==============================================================
'Gord Thompson Stackoverflow: https://stackoverflow.com/questions/25863473/how-to-increase-performance-for-bulk-inserts-to-odbc-linked-tables-in-access
'==============================================================
Sub bulk_insert()
Dim cdb As DAO.Database
Dim rst As DAO.Recordset
Dim t0 As Single
Dim i As Long
Dim c As Long
Dim valueList As String
Dim separator As String
Dim separator2 As String
t0 = Timer
Set cdb = CurrentDb
Set rst = cdb.OpenRecordset("SELECT * FROM bulk_insert", dbOpenSnapshot)
i = 0
valueList = ""
separator = ""
Do Until rst.EOF
i = i + 1
valueList = valueList & separator & "("
separator2 = ""
For c = 0 To rst.Fields.Count - 1
valueList = valueList & separator2 & "'" & rst.Fields(c) & "'"
If c = 0 Then
separator2 = ","
End If
Next c
valueList = valueList & ")"
If i = 1 Then
separator = ","
End If
If i = 1000 Then
SendInsert valueList
i = 0
valueList = ""
separator = ""
End If
rst.MoveNext
Loop
If i > 0 Then
SendInsert valueList
End If
rst.Close
Set rst = Nothing
Set cdb = Nothing
Debug.Print "Elapsed time " & Format(Timer - t0, "0.0") & " seconds."
End Sub
'==============================================================
Sub SendInsert(valueList As String)
Dim cdb As DAO.Database
Dim qdf As DAO.QueryDef
Set cdb = CurrentDb
Set qdf = cdb.CreateQueryDef("")
qdf.Connect = cdb.TableDefs("dbo_tblCVR_Matching_tmp").Connect
qdf.ReturnsRecords = False
qdf.sql = "INSERT INTO dbo.tblCVR_Matching_tmp (" & _
"Associate_Id , Recd_Date, Price_Sheet_Eff_Date, VenAlpha, Mfg_Name, Mfg_Model_Num, Fei_Alt1_Code, Mfg_Product_Num, Base_Model_Num, Product_Description," & _
"Qty_Base_UOM , Price_Invoice_UOM, Mfr_Pub_Sugg_List_Price, Mfr_Net_Price, IMAP_Pricing, Min_Order_Qty, UPC_GTIN, Each_Weight, Each_Length, Each_Width," & _
"Each_Height, Inner_Pack_GTIN_Num, Inner_Pack_Qty, Inner_Pack_Weight, Inner_Pack_Length, Inner_Pack_Width, Inner_Pack_Height, Case_GTIN_Num, Case_Qty," & _
"Case_Weight, Case_Length, Case_Width, Case_Height, Pallet_GTIN_Num, Pallet_Qty, Pallet_Weight, Pallet_Length, Pallet_Width, Pallet_Height, Pub_Price_Sheet_Eff_Date," & _
"Price_Sheet_Name_Num, Obsolete_YN, Obsolete_Date, Obsolete_Stock_Avail_YN, Direct_Replacement, Substitution, Shelf_Life_YN, Shelf_Life_Time, Shelf_Life_UOM," & _
"Serial_Num_Req_YN, LeadLaw_Compliant_YN, LeadLaw_3rd_Party_Cert_YN, LeadLaw_NonPotable_YN, Compliant_Prod_Sub, Compliant_Prod_Plan_Ship_Date, Green, GPF, GPM," & _
"GPC, Freight_Class, Gasket_Material, Battery_YN, Battery_Type, Battery_Count, MSDS_YN, MSDS_Weblink, Hazmat_YN, UN_NA_Num, Proper_Shipping_Name," & _
"Hazard_Class_Num, Packing_Group, Chemical_Name, ORMD_YN, NFPA_Storage_Class, Kit_YN, Load_Factor, Product_Returnable_YN, Product_Discount_Category," & _
"UNSPSC_Code, Country_Origin, Region_Restrict_YN, Region_Restrict_Regulations, Region_Restrict_States, Prop65_Eligibile_YN, Prop65_Chemical_Birth_Defect," & _
"Prop65_Chemical_Cancer, Prop65_Chemical_Reproductive, Prop65_Warning, CEC_Applicable_YN, CEC_Listed_YN, CEC_Model_Num, CEC_InProcess_YN, CEC_Compliant_Sub," & _
"CEC_Compliant_Sub_Cross_YN, Product_Family_Name, Finish, Kitchen_Bathroom, Avail_Order_Date, FEI_Exclusive_YN, MISC1, MISC2, MISC3" & _
") Values " & valueList
'this is the line that is always highlighted when the error occurs
qdf.Execute dbFailOnError
Set qdf = Nothing
Set cdb = Nothing
End Sub
This is the final version of the code after testing it a million times, just in case someone runs into my same issue. Again thx to Albert Kallal for helping me out on this.
I added some comments in the code as well as additional information to get this thing working on one go.
In my case,
I took care of any duplicates before querying the records (i.e. I created an append query to copy the records to a local table with a primary key)
Created a pass through query 'p'
Used a function to help me escape chars such as the single quote char and deal with nulls and blanks
Integrated a dlookup function to prevent me from going crazy on hard coding the names of every column on my query. Also to allow filtering of empty columns to maximize the use of the chunk size
' =============================================================
' Credit to Albert Kallal Getting ODBC - System Resources Exceeded (Rutime error 3035)
' =============================================================
Sub bulk_insert()
Dim rstLocal As DAO.Recordset
Set rstLocal = CurrentDb.OpenRecordset("bi") 'bi is the name of the query I'm using to list of the records in the bulk
Dim sBASE As String ' base sql insert string
Dim sValues As String ' our values() list built up
Dim t As Single
t = Timer
Dim i As Long
Dim j As Long
Dim c As Long
Dim ChunkSize As Long ' # length size of "text" to send to server
Dim separator2 As String
Dim potentialHeader As String
Dim test
Dim filledArray() As Long
ChunkSize = 48000 'chunk size / or number of chars
'Try to programmatically create the insert, we will also remove anything that doesn't have values
With rstLocal
If Not rstLocal.EOF Then
sBASE = "INSERT INTO dbo.tblCVR_Matching_tmp (" 'this is where I added my SQL table
ReDim filledArray(0 To .Fields.Count - 1)
separator2 = ""
For c = 0 To .Fields.Count - 1 'using loop to get all the headers in my query
potentialHeader = .Fields(c).Name
test = DLookup(potentialHeader, "bi", potentialHeader & " is not null") 'using the dlookup function to isolate headers from my query that have values in its column
If test <> "" Then
filledArray(c) = 1
sBASE = sBASE & separator2 & potentialHeader
separator2 = ","
Else
filledArray(c) = 0
End If
Next c
sBASE = sBASE & ") VALUES "
End If
End With
Dim RowsInChunk As Long ' this will show rows that fit into a chunk
Dim RowCountOut As Long
sValues = ""
Do While rstLocal.EOF = False
RowCountOut = RowCountOut + 1
If sValues <> "" Then sValues = sValues & ","
RowsInChunk = RowsInChunk + 1
sValues = sValues & "("
separator2 = ""
With rstLocal
For c = 0 To .Fields.Count - 1
If filledArray(c) = 1 Then
sValues = sValues & separator2 & sql_escape(.Fields(c)) 'using sql_escape function for cells that have 'null' or single quotes... the function helps escape the characters to avoid getting errors on the insert
separator2 = ","
Else
'SKIP IF ALL NULLS
End If
Next c
End With
sValues = sValues & ")"
If (Len(sBASE) + Len(sValues)) >= ChunkSize Then
'send data to server
With CurrentDb.QueryDefs("p")
.sql = sBASE & sValues
.Execute
End With
Debug.Print "Rows in batch = " & RowsInChunk 'displays the number of rows per batch sent on each bulk insert statement
RowsInChunk = 0
sValues = ""
DoEvents
End If
rstLocal.MoveNext
Loop
' send out last batch (if any)
If sValues <> "" Then
With CurrentDb.QueryDefs("p") 'using pass through query here. I named mine 'p'
.sql = sBASE & sValues
.Execute
End With
sValues = ""
End If
rstLocal.Close
t = Timer - t
Debug.Print "done - time = " & t 'displays information on the immediate window as to the total duration of the sub
End Sub
====this is the sql_escape function========
' detects if a values is string or null and properly escapes it
Public Function sql_escape(val As Variant)
If LCase(val) = "null" Or val = "" Or IsNull(val) Then
sql_escape = "NULL"
Else
' also need to escape "'" for proper sql
val = Replace(val, "'", "''")
sql_escape = "'" & val & "'"
End If
End Function

Answer 1

In your loop, put in a test for the value length.
I would trigger the insert at about 4000 characters, maybe try 8000.
Also, you want to use a pass-though query for this, else it will be slow.
So, the code will be say like you have, but make sure the output format is in t-sql (sql server) format, and not JET/ACE sql format.
Note that sql server DOES have a short hand for inserts, and we WANT to use that fact since this reduces the overhead (the sql syntax) by a large amount (and looking at your code, you DO seem to be doing this).
So, the formart we want is this:
INSERT INTO tblBig (ID, FirstName, LastName, City)
VALUES (134, 'Albert', 'Kallal', 'Edmonton'),
VALUES (134, 'Albert', 'Kallal', 'Edmonton'),
VALUES (134, 'Albert', 'Kallal', 'Edmonton');
Note how we only need ONE insert command for many rows.
So, our code stub will look like this:
Sub TestAppendNeedForSpeed()
' I wanted to allow PK inserts
With CurrentDb.QueryDefs("qryPass1")
.SQL = "SET IDENTITY_INSERT TBLbIG1 ON;"
.Execute
End With
Dim rstLocal As dao.Recordset
Set rstLocal = CurrentDb.OpenRecordset("tblBig")
Dim sBASE As String ' base sql insert string
Dim sValues As String ' our values() list built up
Dim t As Single
t = Timer
Dim i As Long
Dim j As Long
Dim ChunkSize As Long ' # length size of "text" to send to server
ChunkSize = 4000 ' I don't think going higher will help
sBASE = "INSERT INTO tblBig1 (ID,FirstName,LastName,City) VALUES "
Dim RowsInChunk As Long ' this will show rows that fit into a chunk - only FYI
Dim RowCountOut As Long
sValues = ""
Do While rstLocal.EOF = False
RowCountOut = RowCountOut + 1
If sValues <> "" Then sValues = sValues & ","
RowsInChunk = RowsInChunk + 1
With rstLocal
sValues = sValues & "(" & !ID & "," & qu(!FirstName) & "," & qu(!LastName) & "," & qu(!City) & ")"
End With
If (Len(sBASE) + Len(sValues)) >= ChunkSize Then
' send data to server
With CurrentDb.QueryDefs("qryPass1")
.SQL = sBASE & sValues
.Execute
End With
Debug.Print "(" & RowCount & ") -- buffer out - " & RowsInChunk
RowsInChunk = 0
sValues = ""
DoEvents
End If
rstLocal.MoveNext
Loop
' send out last batch (if any)
If sValues <> "" Then
With CurrentDb.QueryDefs("qryPass1")
.SQL = sBASE & sValues
.Execute
End With
sValues = ""
End If
rstLocal.Close
t = Timer - t
Debug.Print "done - time = " & t
End Sub
So, the way we have this laid out, we can set/tweak/test/try the best chunk size.
You not even close and in the same ball part to insert 4000 rows at a time. Try about 4000 characters, maybe 8000. Some systems, I seen about 12000 char chunk size work best.
And as noted, use the above pass-though query idea - it will also run MUCH faster.
You can expect about 15x to 20x speed improvement with above. So, in place of say 120 minutes, you see about 6 minutes of time.
So, use the above template and approach. Of course the ONE row of values could be an external sub (or function) call, but the above approach will get you the best speed.