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The first thing that pops out should be Our trigger fired twice! We had a one-row table with a BEFORE FOR EACH ROW trigger on it. We updated one row, yet the trigger fired two times. Think of the potential implications of this. If you have a trigger that does anything nontransactional, this could be a fairly serious issue. For example, consider a trigger that sends an update where the body of the e-mail is This is what the data used to look like. It has been modified to look like this now. If you sent the e-mail directly from the trigger, using UTL_SMTP in Oracle9i or UTL_MAIL in Oracle 10g and above, then the user would receive two e-mails, with one of them reporting an update that never actually happened. Anything you do in a trigger that is nontransactional will be impacted by a restart. Consider the following implications: Consider a trigger that maintains some PL/SQL global variables, such as for the number of rows processed. When a statement that restarts rolls back, the modifications to PL/SQL variables won t roll back.

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Virtually any function that starts with UTL_ (UTL_FILE, UTL_HTTP, UTL_SMTP, and so on) should be considered susceptible to a statement restart. When the statement restarts, UTL_FILE won t un-write to the file it was writing to. Any trigger that is part of an autonomous transaction must be suspect. When the statement restarts and rolls back, the autonomous transaction can t be rolled back.

Note You can also use wsdl.exe to generate F# code by adding a command-line option that gives an explicit reference to the F# CodeDom dynamic code generator. For example, an option such as /language: "Microsoft.FSharp.Compiler.CodeDom.FSharpCodeProvider, Microsoft.FSharp.Compiler. CodeDom, Version=1.9.2.9, Culture=neutral, PublicKeyToken=a19089b1c74d0809" can be used. Note the similarity with the CodeDom reference used in the web.config file in Listing 14-2. The generated file can then be compiled as normal, though the authors have found that small adjustments sometimes need to be made to the generated code.

All of these consequences must be handled with care in the belief that they may be fired more than once per row or be fired for a row that won t be updated by the statement after all The second reason you should care about potential restarts is performance related We have been using a single-row example, but what happens if you start a large batch update and it is restarted after processing the first 100,000 records It will roll back the 100,000 row changes, restart in SELECT FOR UPDATE mode, and do the 100,000 row changes again after that You might notice, after putting in that simple audit trail trigger (the one that reads the :NEW and :OLD values), that performance is much worse than you can explain, even though nothing else has changed except the new triggers.

It could be that you are restarting queries you never used in the past Or the addition of a tiny program that updates just a single row here and there makes a batch process that used to run in an hour suddenly run in many hours due to restarts that never used to take place This is not a new feature of Oracle it has been in the database since version 40, when read consistency was introduced I myself was not totally aware of how it worked until the summer of 2003 and, after I discovered what it implied, I was able to answer a lot of How could that have happened questions from my own past It has made me swear off using autonomous transactions in triggers almost entirely, and it has made me rethink the way some of my applications have been implemented.

You can reference these two generated DLLs from F# Interactive using the following references: > #r @"C:\fsharp\WeatherForecast.dll";; > #r @"C:\fsharp\TerraService.dll";; You can now use these web services directly from F# Interactive: > open System;; > open WebReferences;; > let ws = new WeatherForecast();; val ws : WeatherForecast

For example, I ll never send e-mail from a trigger directly; rather, I ll always use DBMS_JOB or something similar to send the e-mail after my transaction commits This makes the sending of the e-mail transactional; that is, if the statement that caused the trigger to fire and send the e-mail is restarted, the rollback it performs will roll back the DBMS_JOB request Most everything nontransactional that I did in triggers was modified to be done in a job after the fact, making it all transactionally consistent..

> let weather = ws.GetWeatherByPlaceName("Los Angeles");; val weather : WeatherForecasts > let today = weather.Details.[0];; val today : WeatherData > printf "Temperature: %sF/%sC\n" today.MaxTemperatureF today.MaxTemperatureC;; Temperature: 100F/38C val it : unit = () > let ts = new TerraService();; val ts : TerraService > let place = new Place(City="Los Angeles", State="CA", Country="USA");; val place : Place > let facts = ts.GetPlaceFacts(place);; val facts : PlaceFacts > printfn "Lat/Lon: %f/%f" facts.Center.Lat facts.Center.Lon;; Lat/Lon: 33.833000/-118.217003

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