Hi Edward
I'm also coming from a delphi background (using FIB) and we have ported/are
already porting for 5 years our applications to .net. I have noticed indeed
that Delphi/fib is faster then .net provider. But never in the magnitude of
500%. It looked acceptable slower.
Your "write" code seems to be correct and pretty optimal. Usually people
recreate a command each time. I've also done some profiling in the past and
I've noticed that keeping a reference to the parameter doesn't help much. A
slightly slower method, but way less code is to "clear" the parameters and
recreate them. Once again, It is slightly slower, neglectible, but in your
scenario 170 lines of code less.
using (command = new command){ var par = command.Parameters while (! Eof){
par.Clear(); par.Add(Id); par.Add(Value); ... }}
On the other hand Firebird is an open source database and also the .net
provider. Jiri (the guy supporting this) is getting a few bucks per month to
support this. We, as a company, sometimes sponsor these things by testing,
benchmarking or lazy picking up the bill. Since you have a testing environment
up and running, you might walk the extra mile and help everybody by profiling a
bit deeper? This would benefit you, me and everybody.
Two more things...
1. Your transaction parameters please. How do you create them, what
settings?2. Did you check your "source-read" logic. Cound you maybe fake
data, so we know if it is the "insert" that is slow. Maybe the materializing
of the source record is slow or fetching it?
Looking forward for tackling this thing.
thanks
a
From: emendez...@nc.rr.com
To: firebird-net-provider@lists.sourceforge.net
Date: Thu, 7 Aug 2014 18:14:43 -0400
Subject: Re: [Firebird-net-provider] Questions with performance metrics doing
large inserts into DB
Hello All, I have to develop an application that will move "old/stale" data
from certain tables to another FB DB. We already have an existing application
that did something similar to this, but his application is written using Delphi
5 and we are a .NET shop and wanted to develop newer applications using .NET
technologies so we can reuse our developer resources. Little by Little we have
been migrating off from Delphi5 to .NET. In our shop we are running various
instances of FB on 2.14 Classic on CentOS 5.6. Our Database is larger than
250GB. In past .NET projects I have used Dapper dot Net and thought that this
might fit the requirements. We developed a working prototype of what we wanted
I had our testers run the application to see what they thought. To my dismay,
they informed me that the performance was terrible. In some cases we need to
archive millions of rows to the other Database. And it seemed using dapper was
not giving us acceptable results. The users said that using the old Delphi
applications was quicker when archiving data ( that Delphi application has
functionality that also archives different data to other Databases). I wanted
to have a baseline test so we can compare apples to apples. I trimmed down the
prototype to eliminate Dapper dot net and use straight ADO.NET for the Inserts
using the latest Firebird.NET provider on .NET 4.5.1. In the
application once the data was retrieved I read it one row at a time, because
trying to read in over a million rows into memory would cause Out of Memory
issues. A sample of the code I am using is shown below. As I looped over the
results, I reported on every 1000 rows and calculated elapsed times every 5000
rows. Running this application from various computers in our infrastructure to
various target DBs the best performance I got was 19 seconds for 5000 rows. I
then put on my Delphi Hat On and created a small app that did similar to what
the .NET app is doing and the Delphi app’s performance blew away the .NET
performance with a consistent 5000 rows @ 4 seconds. This is Delphi5! >From the
year 1999. I also have to add that I am using the FIBPlus data components from
devrace. Below is an edited version of my .NET code. query = @"Select *** Here
is my Select Query from the Source DB *** "; // This is using dapper.net to
retrieve the rows I need.var en = db_source.Query<TABLE_A_DTO>(query, new {
ARCHIVE_SET_ID = m_archiveSetId, ARCHIVE_DATA_TYPE = _tableName },
srcTransaction, buffered: false);int totalUpdated = 0;JobStartTime =
DateTime.Now;try { using (FbConnection db_target =
((FbConnection)GetConnection(targetDB))) {
FbTransaction transaction = db_target.BeginTransaction();
m_isInTransaction = true; using (FbCommand command = new
FbCommand(_updateSQL, db_target, transaction)) {
command.Parameters.Add("TABLE_A_ID",
FbDbType.Integer); //
There are 86 fields in the result set so i do this 85 more times
command.Prepare();
StepStartTime = DateTime.Now; _logger.Write("ARCHIVING
of " + _tableName + " Started", 2); // I get the
Enumerator of the results so I can iterate over them
_iEnumerator = en.GetEnumerator(); while
(_iEnumerator.MoveNext()) {
rowsRead++; var rec =
((TABLE_A_DTO)_iEnumerator.Current);
command.Parameters[0].Value = rec.TABLE_A_ID;
// I do this 85 more times for each
parameter rowsAffected =
command.ExecuteNonQuery(); totalUpdated =
rowsAffected + totalUpdated; if (rowsRead % 1000
== 0) Console.Write(totalUpdated.ToString()
+ "\r"); if (rowsRead % m_recordBufferCount == 0)
{
_logger.Write(string.Format("Archived... Rows Archived = {0}, Elasped Time
{1}", totalUpdated.ToString("N0"), Utils.GetElapsedTime(DateTime.Now -
StepStartTime)), 3); StepStartTime =
DateTime.Now; } } Is the
.NET Provider that slow? I am sure that the Database Configuration has
something to do with the performance, but If that is true I expected that the
Delphi Application show performance results on par with the .NET performance.
Am I doing something blatantly wrong code? I would hate to go back to my Boss
and tell them that if performance is a factor we need to continue with Delphi.
If this open source .NET Provider is not the “fastest on the Block”, are there
any other 3rd party Libraries that I can use with .NET that you would
recommend? Even if it a commercial product? Thanks, Edward Mendez
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