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Effectively, Oracle takes a detour around the modified data it reads around it, reconstructing it from the undo (also known as a rollback) segment (discussed in detail in 9) A consistent and correct answer comes back without waiting for the transaction to commit Now, a database that allowed a dirty read would simply return the value it saw in account 987 at the time it read it, in this case $50000 The query would count the transferred $400 twice Therefore, it not only returns the wrong answer, but also returns a total that never existed in the table at any point in time In a multiuser database, a dirty read can be a dangerous feature and, personally, I have never seen the usefulness of it Say that, rather than transferring, the transaction was actually just depositing $40000 in account 987 The dirty read would count the $400.

When lengthy or complex operations can be carried out by the repeated application of simpler ones, the interaction consists of an iteration: The caller issues a command, and the callee acknowledges it. The caller continues to repeat the command (possibly with different data) until the overall operation is complete, or until one of the two parties stops the process. I ll call this type of interaction a handshaking interaction, because of its similarity with hardware handshaking, used frequently in data communications, where the receiver tells the sender when it is ready for the next command or message. Figure 9-19 shows the pattern.

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00 and get the right answer, wouldn t it Well, suppose the uncommitted transaction was rolled back We have just counted $40000 that was never actually in the database The point here is that dirty read is not a feature; rather, it is a liability In Oracle, it is just not needed You get all of the advantages of a dirty read (no blocking) without any of the incorrect results..

Figure 9-19. The basic handshaking interaction pattern Each handshake tells the caller to send more information, if available. The callee can return a handshake immediately upon receipt of each command, or after each command has been processed. An important decision to make when using a handshaking interaction is this: Who has control over termination of the iteration the caller or the callee The answer depends on which party knows when enough is enough. If the caller knows there are no further commands available, the caller will control termination. If the callee can arbitrarily decide when to bail out of the interaction, the callee will control termination. It s also possible for both parties to control termination. When the callee controls termination, the handshake might contain a reserved field or value to indicate a termination request to make the caller stop issuing commands or sending data.

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The READ COMMITTED isolation level states that a transaction may only read data that has been committed in the database. There are no dirty reads. There may be nonrepeatable reads (i.e., rereads of the same row may return a different answer in the same transaction) and phantom reads (i.e., newly inserted and committed rows become visible to a query that were not visible earlier in the transaction). READ COMMITTED is perhaps the most commonly used isolation level in database applications everywhere, and it is the default mode for Oracle databases. It is rare to see a different isolation level used.

up the saltshaker and shakes it over the pasta repeatedly until the desired amount of salt has been added. In this example, the command is add salt to spaghetti. The caller is the person; the callee is the saltshaker. The handshake is the image of the salt falling on the spaghetti. The interaction is a caller-controlled handshake, because it is the person who decides when to stop adding salt.

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