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Improve performance when saving to database (Read 3644 times)

Espen Lodden Guest	Improve performance when saving to database Nov 7^th, 2005 at 12:25pm	Print Post
	Hello, we are evaluating the FlowChart .NET and have trouble when saving to an Oracle database stream. Loading from the stream works fine, and does not take long time (although it's not fast). Saving however, takes ages. Saving a diagram with two nodes took more than one minute. Is there anything we could do to improve this? Excerpt from our code follows: OracleCommand cmd = new OracleCommand("", conn); OracleDataReader reader; OracleLob lob; OracleTransaction txn = conn.BeginTransaction(); cmd.CommandText = "SELECT schema FROM test WHERE id = 1 FOR UPDATE"; cmd.Transaction = txn; reader = cmd.ExecuteReader(); reader.Read(); lob = reader.GetOracleLob(0); //This function is VERY slow _flowChart.SaveToStream(lob); txn.Commit(); dl.disconnect(conn); Best Regards Espen Lodden www.emisoft.com


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Improve performance when saving to database Reply #1 - Nov 7^th, 2005 at 12:51pm	Print Post
	Hello, Thank you for trying FlowChart.NET. Saving speed has been greatly improved in the version 4 of the control, which is now in beta tests: https://mindfusion.org/_beta/FCNetDemo.zip Although if two nodes are saved for a whole minute, that might mean that the OracleLob Stream implementation is slow. Try calling the flowchart's SaveToString method to measure how much time is needed to save the diagram in a memory buffer, and then write the returned string to a Text/Memo field. Or check whether the Oracle stream has some option to preallocate space for the diagram instead of growing the field dynamically several times. I guess writing to the OracleLob can be very slow also if the Oracle stream uses network communications to access the database without buffering. FlowChart.NET will write many small chunks of data to the stream, so calling SaveToString and then sending the whole string to the Oracle server could be the best solution. Best Regards Stoyan


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Espen Lodden Guest	Re: Improve performance when saving to database Reply #2 - Nov 7^th, 2005 at 1:05pm	Print Post
	Thank you very much for the quick reply. We will try your suggestions. Best Regards Espen Lodden


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Espen Lodden Guest	Re: Improve performance when saving to database Reply #3 - Nov 7^th, 2005 at 1:28pm	Print Post
	Thanks a lot, saving to a string and using byte array to the database worked like a charm. Less than a second. This is very promising! Espen Lodden


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Improve performance when saving to database Reply #4 - Nov 7^th, 2005 at 1:38pm	Print Post
	That's great! But then SaveToString uses 4 times more space than a byte stream would need, because every byte is represented with 2 Unicode characters in the string. So in order to save some space, it will be even better to create a .NET MemoryStream, pass it to the SaveToStream method, and pass the memoryStream's bytes to the Oracle stream. Stoyan


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