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The CopyState() method takes a snapshot of the object s current data and stores it in a Stack object.

Upon COMMIT, Oracle will process each of these lists of 20 block pointers, and if the block is still available, it will perform a fast cleanout So, as long as the number of blocks we modify does not exceed 10 percent of the number of blocks in the cache and our blocks are still in the cache and available to us, Oracle will clean them out upon COMMIT Otherwise, it just skips them (ie, does not clean them out) With this understanding, we can set up artificial conditions to see how the cleanout works I set my DB_CACHE_SIZE to a low value of 16MB, which is sufficient to hold 2,048 8KB blocks (my blocksize is 8KB) Next I create a table such that a row fits on exactly one block I ll never have two rows per block.

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Some reckoned, quite correctly, that the due dates for their accounts payable were being unfairly accelerated! Without a global computer network to flash instantaneously the pope s decision around the world, it took decades and even centuries of earthly time for some of the countries to switch their timekeeping practices to the new Gregorian calendar And the introduction of the Gregorian calendar did not equate with the elimination of the Julian calendar Thus, with the Julian, Gregorian, and other calendars in operation in varying parts of the world, the growing confusion regarding timekeeping was simply a matter of time! Yet, as Sam accurately noted, while becoming more aware of the need to measure time with greater synchronicity to the earthly seasons, humans still did not understand what time was, even as they incessantly continued to observe its apparent effects based on their planet s journey around its native star.

Then I fill this table up with 10,000 rows and COMMIT We know that 10,000 blocks far exceeds 10% of 2048, so the database will not be able to clean out all of these dirty blocks upon commit most of them will not even be in the buffer cache anymore I ll measure the amount of redo I ve generated so far, run a SELECT that will visit each block, and then measure the amount of redo that SELECT generated..

Since UndoableBase is an implementation of n-level undo capability, each object could end up storing a number of snapshots. As each undo or accept operation occurs, it gets rid of the most recently stored snapshot; this is the classic behavior of a stack data structure. Fortunately, the .NET Framework includes a prebuilt Stack(Of T) class that implements the required functionality. It is declared as follows: <NotUndoable()> _ Private _stateStack As New Stack(Of Byte())() This field is marked as NotUndoable to prevent taking a snapshot of previous snapshots. CopyState() should just record the fields that contain actual business data. Once a snapshot has been taken of the object s data, the snapshot is serialized into a single byte stream. That byte stream is then put on the stack. From there, it can be retrieved and deserialized to perform an undo operation if needed.

Note In order for this example to be reproducible and predictable, you ll need to disable SGA automatic memory

management. If that is enabled, there is a chance that the database will increase the size of your buffer cache defeating the math I ve worked out.

The process of taking a snapshot of each field value in an object is a bit tricky Reflection is used to walk through all the fields in the object During this process, each field is checked to determine whether it has the NotUndoable attribute If so, the field is ignored The big issue is that field names may not be unique within an object To see what I mean, consider the following two classes: Namespace Test Public Class BaseClass Private _id As Integer End Class Public Class SubClass Inherits BaseClass Private _id As Integer End Class End Namespace Here, each class has its own field named _id, and in most circumstances it s not a problem However, when using reflection to walk through all the fields in a SubClass object, it will return two _id fields: one for each of the classes in the inheritance hierarchy.

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