![]() ![]() ![]() With the same set of queries, this graph shows the instantaneous bytes per second transferred with NitroAccelerator. This first chart shows the instantaneous bytes per second transferred for a mix of small and large query results being run without NitroAccelerator: With NitroAccelerator optimizing your SQL Server traffic, you not only speed up your data intensive SQL Server processes, you also free up space on your network as shown in the three graphs below. There’s a visible difference on all networks – For example, increasing to 32K packet size can improve performance by an additional 400% with NitroAccelerator. Multiplying the impact of other performance tuning.Reducing the number of TCP packets sent by up to 90%.Optimizing both the application and transport layers.Transforming TDS into an optimized stream of variable length packets that makes your WAN operate at LAN speeds.While there are a number of things that can be done to marginally improve network performance, bringing NitroAccelerator into the picture changes the equation completely by: Now, change the equation with NitroAccelerator: For connections that manipulate large datasets, request 32k packets.Use asynchronous processing with threads in your applications.Instead use multiple connections with connection pooling. Avoid using the connection string setting “Multiple Active Result Sets” because it is horribly inefficient.Microsoft has greatly improved the performance of its TDS drivers over time therefore using the latest is important. Using the very latest SQL driver available.Other items you can do to impact performance of SQL Server network performance include: As a result, the maximum setting of 32 KB can be the best choice even if your environment only occasionally sends large query results. In fact, setting the SQL Server packet size to such a small value causes more network overhead because each packet must have its own TDS header and requires SQL Server to do the dividing and re-assembly of the data. As it turns out, the TCP protocol, which SQL Server leverages, allows up to 64KB (with IPv4) chunks to be handed to it and it manages the task of dividing that up into smaller pieces for optimal transmission. Ignore the incorrect advice of making this size the same as your network’s Maximum Transmission Unit (MTU) size, typically just 1500 bytes. The first tunable item is the size of the SQL Server network packet. Poorly Implemented Applications: Inefficient use of TCP/IP (or TDS in the case of SQL Server) can contribute to network performance issues.įrom a strictly SQL Server perspective there are a few things that can be done to improve network performance. ![]() Underutilization: Failing to fully utilize high-bandwidth connections with high latency, like many WAN connections do, causes issues of efficiency, resource allocation, and user experience.Spurious retransmission: Slow links can lead to packet loss and result in duplicate packet transmission.Packet loss: Occurs due to congestion or an unreliable connection.With the exception of poorly implemented applications, the transport layer is designed to assist with the following performance issues. When data hits the network, there are a number of problems that can cause poor performance. Identifying Network Performance Bottlenecks When tuning SQL Server’s network performance, it is crucial to consider the transport layer, which handles error and flow control for SQL Server. Each layer communicates with its matching layer on remote systems through one or more protocols. The layers in this model correspond to the numbering of the Open Systems Interconnection (OSI) model, on which TCP/IP is based. SQL Server implements its Tabular Data Stream (TDS) protocol at the application layer of TCP/IP’s layered model. To communicate with a SQL Server database, the widely misunderstood TCP protocol from the TCP/IP suite is used. ADD CONSTRAINT DEFAULT (N'') FOR ĪLTER TABLE. IF EXISTS (SELECT 1 FROM WHERE SET Expires=DATEADD(ss, GETDATE()) WHERE INTO ( It seems to be this bug, but isn't this fixed in R2?Īny ideas how to solve or work around this problem?ĬREATE PROCEDURE NVARCHAR(MAX) = INT = 3600 The data I'm trying to write is Base64 encoded data, so it's just a plain string. I did not have this problem with SQL Server 2008, but The stream ended unexpectedly." while trying to write to a table with SP called from PHP with FreeTDS. I'm getting error "The incoming tabular data stream (TDS) protocol stream is incorrect. I'm running SQL Server 2008 R2 on 圆4 environment.
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