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I presented four different techniques to calculate row numbers server-side. One is available only in SQL Server 2005 (using the ROW_NUMBER function), and three (set-based using subqueries, cursorbased, and IDENTITY-based) are available in both versions. As I mentioned earlier, the other three ranking calculations that I'll describe later in this chapter are technically calculated using very similar access methods. So the performance aspects that I discussed and the following benchmark that I'll present are relevant to all ranking calculations. I ran the benchmark shown in Listing 4-7 on my laptop (single CPU: Intel Centrino 1.7 Mhz; RAM: 1GB, single disk drive). Even though my laptop is not exactly the best model for a production server, you can get a good sense of the performance differences between the techniques. The benchmark populates a table with increasing numbers of rows, starting with 10,000 and progressing up to 100,000 in steps of 10,000 rows. The benchmark calculates row numbers using all four techniques, with the Discard Results option turned on in SQL Server Management Studio (SSMS) to remove the effect of generating the output. The benchmark records the run times in milliseconds in the RNBenchmark table.
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Listing 4-7. Benchmark comparing techniques to calculate row numbers
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-- Change Tool's Options to Discard Query Results SET NOCOUNT ON; USE tempdb; GO IF OBJECT_ID('dbo.RNBenchmark') IS NOT NULL DROP TABLE dbo.RNBenchmark; GO IF OBJECT_ID('dbo.RNTechniques') IS NOT NULL DROP TABLE dbo.RNTechniques;
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GO IF OBJECT_ID('dbo.SalesBM') IS NOT NULL DROP TABLE dbo.SalesBM; GO IF OBJECT_ID('dbo.SalesBMIdentity') IS NOT NULL DROP TABLE dbo.SalesBMIdentity; GO IF OBJECT_ID('dbo.SalesBMCursor') IS NOT NULL DROP TABLE dbo.SalesBMCursor; GO CREATE TABLE dbo.RNTechniques ( tid INT NOT NULL PRIMARY KEY, technique VARCHAR(25) NOT NULL ); INSERT INTO RNTechniques(tid, technique) INSERT INTO RNTechniques(tid, technique) INSERT INTO RNTechniques(tid, technique) INSERT INTO RNTechniques(tid, technique) GO
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VALUES(1, VALUES(2, VALUES(3, VALUES(4,
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'Set-Based 2000'); 'IDENTITY'); 'Cursor'); 'ROW_NUMBER 2005');
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CREATE TABLE dbo.RNBenchmark ( tid INT NOT NULL REFERENCES dbo.RNTechniques(tid), numrows INT NOT NULL, runtimems BIGINT NOT NULL, PRIMARY KEY(tid, numrows) ); GO CREATE TABLE dbo.SalesBM ( empid INT NOT NULL IDENTITY PRIMARY KEY, qty INT NOT NULL ); CREATE INDEX idx_qty_empid ON dbo.SalesBM(qty, empid); GO CREATE TABLE dbo.SalesBMIdentity(empid INT, qty INT, rn INT IDENTITY); GO CREATE TABLE dbo.SalesBMCursor(empid INT, qty INT, rn INT); GO DECLARE @maxnumrows AS INT, @steprows AS INT, @curnumrows AS INT, @dt AS DATETIME; SET @maxnumrows SET @steprows SET @curnumrows = 100000; = 10000; = 10000;
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WHILE @curnumrows <= @maxnumrows BEGIN TRUNCATE TABLE dbo.SalesBM;
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INSERT INTO dbo.SalesBM(qty) SELECT CAST(1+999.9999999999*RAND(CHECKSUM(NEWID())) AS INT) FROM dbo.Nums WHERE n <= @curnumrows; -- 'Set-Based 2000' DBCC FREEPROCCACHE WITH NO_INFOMSGS; DBCC DROPCLEANBUFFERS WITH NO_INFOMSGS; SET @dt = GETDATE(); SELECT empid, qty, (SELECT COUNT(*) FROM dbo.SalesBM AS S2 WHERE S2.qty < S1.qty OR (S2.qty = S1.qty AND S2.empid <= S1.empid)) AS rn FROM dbo.SalesBM AS S1 ORDER BY qty, empid; INSERT INTO dbo.RNBenchmark(tid, numrows, runtimems) VALUES(1, @curnumrows, DATEDIFF(ms, @dt, GETDATE())); -- 'IDENTITY' TRUNCATE TABLE dbo.SalesBMIdentity; DBCC FREEPROCCACHE WITH NO_INFOMSGS; DBCC DROPCLEANBUFFERS WITH NO_INFOMSGS; SET @dt = GETDATE(); INSERT INTO dbo.SalesBMIdentity(empid, qty) SELECT empid, qty FROM dbo.SalesBM ORDER BY qty, empid; SELECT empid, qty, rn FROM dbo.SalesBMIdentity; INSERT INTO dbo.RNBenchmark(tid, numrows, runtimems) VALUES(2, @curnumrows, DATEDIFF(ms, @dt, GETDATE())); -- 'Cursor' TRUNCATE TABLE dbo.SalesBMCursor; DBCC FREEPROCCACHE WITH NO_INFOMSGS; DBCC DROPCLEANBUFFERS WITH NO_INFOMSGS; SET @dt = GETDATE(); DECLARE @empid AS INT, @qty AS INT, @rn AS INT; BEGIN TRAN DECLARE rncursor CURSOR FAST_FORWARD FOR SELECT empid, qty FROM dbo.SalesBM ORDER BY qty, empid; OPEN rncursor;
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SET @rn = 0; FETCH NEXT FROM rncursor INTO @empid, @qty; WHILE @@fetch_status = 0 BEGIN SET @rn = @rn + 1; INSERT INTO dbo.SalesBMCursor(empid, qty, rn) VALUES(@empid, @qty, @rn); FETCH NEXT FROM rncursor INTO @empid, @qty; END CLOSE rncursor; DEALLOCATE rncursor; COMMIT TRAN SELECT empid, qty, rn FROM dbo.SalesBMCursor; INSERT INTO dbo.RNBenchmark(tid, numrows, runtimems) VALUES(3, @curnumrows, DATEDIFF(ms, @dt, GETDATE())); -- 'ROW_NUMBER 2005' DBCC FREEPROCCACHE WITH NO_INFOMSGS; DBCC DROPCLEANBUFFERS WITH NO_INFOMSGS; SET @dt = GETDATE(); SELECT empid, qty, ROW_NUMBER() OVER(ORDER BY qty, empid) AS rn FROM dbo.SalesBM; INSERT INTO dbo.RNBenchmark(tid, numrows, runtimems) VALUES(4, @curnumrows, DATEDIFF(ms, @dt, GETDATE())); SET @curnumrows = @curnumrows + @steprows; END
The following query returns the benchmark's results in a conveniently readable format, which is shown in Table 4-29: SELECT numrows, [Set-Based 2000], [IDENTITY], [Cursor], [ROW_NUMBER 2005] FROM (SELECT technique, numrows, runtimems FROM dbo.RNBenchmark AS B JOIN dbo.RNTechniques AS T ON B.tid = T.tid) AS D PIVOT(MAX(runtimems) FOR technique IN( [Set-Based 2000], [IDENTITY], [Cursor], [ROW_NUMBER 2005])) AS P ORDER BY numrows;
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