resource/aws_db_instance: Remove indentifier_prefix truncation for sq…

…lserver engine (#9040)

The original limitation is no longer present. Verified SQL Server provisioning with lengthy `identifier_prefix` specified and this code change.

aws/resource_aws_db_instance.go

@@ -512,12 +512,6 @@ func resourceAwsDbInstanceCreate(d *schema.ResourceData, meta interface{}) error
 			identifier = resource.UniqueId()
 		}
 
-		// SQL Server identifier size is max 15 chars, so truncate
-		if engine := d.Get("engine").(string); engine != "" {
-			if strings.Contains(strings.ToLower(engine), "sqlserver") {
-				identifier = identifier[:15]
-			}
-		}
 		d.Set("identifier", identifier)
 	}