Calling an SP takes over 200% more time over the select statement
As part of my POC converting a SQL Server application over to SAP HANA, I'm find that CALL is taking over 200% more time than calling the SELECT statement directly. The result is that the application that uses ODBC against HANA with CALL statements is taking much more time than SQL Server. I'm finding this for all stored procedure calls in the application. Here is an example:
CREATE PROCEDURE dbo.usp_GetOrdersByCustomerID
(IN C_ID bigint)
LANGUAGE SQLSCRIPT DEFAULT SCHEMA "DBO" READS SQL DATA
AS BEGIN
SELECT TOP 20
C_F_NAME,
C_L_NAME,
C_EMAIL,
O_ID,
O_TOTAL,
O_DTS,
O_FM_DTS
FROM dbo.Customer JOIN dbo.Orders ON C_ID = O_C_ID
WHERE C_ID = :C_ID
ORDER BY O_ID DESC;
END;
When using the following CALL statement in SAP HANA Studio
CALL dbo.usp_GetOrdersByCustomerID(3429);
I get execution times that look like this:
Statement 'CALL dbo.usp_GetOrdersByCustomerID(3429)'
successfully executed in 9 ms 663 µs (server processing time: 8 ms 115 µs)
Fetched 5 row(s) in 0 ms 69 µs (server processing time: 0 ms 0 µs)
Statement 'CALL dbo.usp_GetOrdersByCustomerID(3429)'
successfully executed in 11 ms 851 µs (server processing time: 8 ms 238 µs)
Fetched 5 row(s) in 0 ms 62 µs (server processing time: 0 ms 0 µs)
Statement 'CALL dbo.usp_GetOrdersByCustomerID(3429)'
successfully executed in 8 ms 522 µs (server processing time: 6 ms 892 µs)
Fetched 5 row(s) in 0 ms 93 µs (server processing time: 0 ms 0 µs)
When I execute the select statement with the hard coded parameter value, I get much faster results:
Statement 'SELECT TOP 20 C_F_NAME, C_L_NAME, C_EMAIL, O_ID, O_TOTAL, O_DTS, O_FM_DTS FROM dbo.Customer JOIN ...'
successfully executed in 4 ms 430 µs (server processing time: 2 ms 424 µs)
Fetched 5 row(s) in 0 ms 73 µs (server processing time: 0 ms 0 µs)
Statement 'SELECT TOP 20 C_F_NAME, C_L_NAME, C_EMAIL, O_ID, O_TOTAL, O_DTS, O_FM_DTS FROM dbo.Customer JOIN ...'
successfully executed in 4 ms 105 µs (server processing time: 2 ms 210 µs)
Fetched 5 row(s) in 0 ms 69 µs (server processing time: 0 ms 0 µs)
Statement 'SELECT TOP 20 C_F_NAME, C_L_NAME, C_EMAIL, O_ID, O_TOTAL, O_DTS, O_FM_DTS FROM dbo.Customer JOIN ...'
successfully executed in 4 ms 694 µs (server processing time: 2 ms 810 µs)
Fetched 5 row(s) in 0 ms 60 µs (server processing time: 0 ms 0 µs)
I have 500,000 rows in the Customers table and 2,500,000 rows in the Orders table. The tables are COLUMN tables.
Is there an optimization that I'm missing?
Regards,
Bill
Hi Bill,
Can you please try something:
tab_cust =
SELECT
C_F_NAME,
C_L_NAME,
C_EMAIL
FROM dbo.Customer
WHERE C_ID = :C_ID;
tab_orders =
SELECT
O_ID,
O_TOTAL,
O_DTS,
O_FM_DTS
FROM dbo.Orders ON C_ID = O_C_ID
WHERE O_C_ID = :C_ID
SELECT TOP 20
C_F_NAME,
C_L_NAME,
C_EMAIL,
O_ID,
O_TOTAL,
O_DTS,
O_FM_DTS
FROM :tab_cust JOIN :tab_orders ON C_ID = O_C_ID
ORDER BY O_ID DESC;
END;
Expected behavior: The data set for each of the tables is filtered out and then joined. Although the filter is expected to be pushed to each of the joined tables even in your case, but this is worth the try.
Regards,
Ravi
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