Session presentation around Azure SQL Databases and insert possibilities from the session https://www.youtube.com/watch?v=mA8FcD6q8wk

1. Morne Blake
Cloud Solution Architect
Microsoft
Azure SQL Database Insert Performance

2. Why are the inserts so slow?
10 DTU SQL Database – 10 000 rows
• ForEach loop 15 minutes
• Throw the whole insert – time out and about 4 000 rows written
100 DTU SQL Database – 100 000 rows
• ForEach loop 10 minutes
• Throw the whole insert – time out and about 7 000 rows written

3. Is Azure SQL database just slow?
No!

4. Let’s have a look at some code!
Written by a SQL guy ;)

5. What about updates?
• Same patterns can be applied
• Use table value parameters in a stored procedure
• Use Bulk Insert

6. Merge
MERGE Employee AS target
USING
(SELECT [FirstName], [LastName], [SocialSecurityNumber] FROM @employees) AS source
([FirstName], [LastName], [SocialSecurityNumber])
ON
(target.[SocialSecurityNumber] = source.[SocialSecurityNumber])
WHEN MATCHED THEN UPDATE SET
target.FirstName = source.FirstName, target.LastName = source.LastName
WHEN NOT MATCHED THEN INSERT
([FirstName], [LastName], [SocialSecurityNumber]) VALUES (source.[FirstName],
source.[LastName], source.[SocialSecurityNumber]);

7. using (var command = new SqlCommand("", sqlConn))
{
command.CommandText =
"CREATE TABLE #TmpDiskPrice (" +
"[Name] [nvarchar] (400) NOT NULL," +
"[Type] [nvarchar] (400) NOT NULL," +
//Some More things go here
);";
command.ExecuteNonQuery();
using (var bc = new SqlBulkCopy(sqlConn))
{
bc.DestinationTableName = "#TmpDiskPrice";
bc.ColumnMappings.Add("Name", "Name");
bc.ColumnMappings.Add("Type", "Type");
//Some More things go here
bc.WriteToServer(dt2);
}
command.CommandTimeout = 300;
command.CommandText = "MERGE dbo.apiManagedDisks AS Target " +
"USING (SELECT [Name], [RegionName],[currency],[Transactions], " +
"[PremiumSnapshot], [StandardSnapshotLrs], [StandardSnapshotZrs], [Size], [Speed], " +
"[Iops], [Price], [Type] FROM dbo.#TmpDiskPrice) AS Source " +
"ON (Target.Name = Source.Name AND Target.regionName = Source.regionName " +
"AND Target.currency = Source.currency AND Target.Type = Source.Type) " +
"WHEN MATCHED THEN " +
"UPDATE SET Target.Transactions = Source.Transactions, " +
"Target.PremiumSnapshot = Source.PremiumSnapshot," +
"Target.StandardSnapshotLrs = Source.StandardSnapshotLrs, " +
"Target.StandardSnapshotZrs = Source.StandardSnapshotZrs, " +
"Target.Size = Source.Size, " +
"Target.Speed = Source.Speed, " +
"Target.Iops = Source.Iops, " +
"Target.Price = Source.Price " +
"WHEN NOT MATCHED BY TARGET THEN " +
"INSERT([Name], [Type], [regionName],[currency],[Transactions], [StandardSnapshotLrs], [StandardSnapshotZrs]" +
", [PremiumSnapshot], [Size], [Speed], [Iops], [Price]) " +
"VALUES(Source.Name, Source.Type, Source.regionName, Source.currency, " +
"Source.Transactions, Source.StandardSnapshotLrs, Source.StandardSnapshotZrs," +
"Source.PremiumSnapshot ,Source.Size,Source.Speed,Source.Iops, Source.Price); " +
"DROP TABLE #TmpDiskPrice; ";
command.ExecuteNonQuery();