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However, achieving READ COMMITTED isolation is not as cut-and-dried as it sounds. If you look at Table 7-1, it appears straightforward. Obviously, given the earlier rules, a query executed in any database using the READ COMMITTED isolation will behave in the same way, will it not It will not. If you query multiple rows in a single statement then, in almost every other database, READ COMMITTED isolation can be as bad as a dirty read, depending on the implementation. In Oracle, using multi-versioning and read-consistent queries, the answer we get from the ACCOUNTS query is the same in READ COMMITTED as it was in the READ UNCOMMITTED example. Oracle will reconstruct the modified data as it appeared when the query began, returning the answer that was in the database when the query started. Let s now take a look at how our previous example might work in READ COMMITTED mode in other databases you might find the answer surprising. We ll pick up our example at the point described in the previous table: We are in the middle of the table. We have read and summed the first N rows. The other transaction has moved $400.00 from account 123 to account 987. The transaction has not yet committed, so rows containing the information for accounts 123 and 987 are locked. We know what happens in Oracle when it gets to account 987 it will read around the modified data, find out it should be $100.00, and complete. Table 7-4 shows how another database, running in some default READ COMMITTED mode, might arrive at the answer. Table 7-4. Timeline in a Non-Oracle Database Using READ COMMITTED Isolation

Updates row 1 and puts an exclusive lock on row 1, preventing other updates and reads. Row 1 now has $100.00. Reads row N. Sum = . . . Updates row 342,023 and puts an exclusive lock on this row. Row 342,023 now has $500.00. Tries to read row 342,023 and discovers that it is locked. This session will block and wait for this block to become available. All processing on this query stops. Commits transaction. Reads row 342,023, sees $500.00, and presents a final answer that includes the $400.00 double-counted.

4. Click OK to close the Colors dialog box. 5. Modify the remaining colors, if desired, then click OK to close the Options dialog box.

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channel uses packets to carry information, and each packet can hold 2 KB. Typical images are more than 50 MB in size, so you must break them down into blocks that fit into channel packets. Figure 9-20 shows the interactions between the transmitter and receiver components.

The first thing to notice is that this other database, upon getting to account 987, will block our query. This session must wait on that row until the transaction holding the exclusive lock

Figure 9-20. Handshaking in an image transmission system The transmitter acts as the caller, the receiver as the callee. To signal the end of an image, a last packet is sent with zero bytes. During the interaction, the receiver doesn t know how much data will arrive. Only the caller does, and it uses a special signal to tell the receiver when the interaction is complete.

commits. This is one reason why many people have a bad habit of committing every statement, instead of processing well-formed transactions consisting of all of the statements needed to take the database from one consistent state to the next. Updates interfere with reads in most other databases. The really bad news in this scenario is that we are making the end user wait for the wrong answer. We still receive an answer that never existed in the database at any point in time, as with the dirty read, but this time we made the user wait for the wrong answer. In the next section, we ll look at what these other databases need to do to achieve read-consistent, correct results. The important lesson here is that various databases executing in the same, apparently safe isolation level can and will return very different answers under the exact same circumstances. It is important to understand that, in Oracle, non-blocking reads are not had at the expense of correct answers. You can have your cake and eat it too, sometimes.

On the Color tab of the Options dialog box, you can copy the colors from another open workbook by Tip

Summary

The goal of REPEATABLE READ is to provide an isolation level that gives consistent, correct answers and prevents lost updates. We ll take a look at examples of both, see what we have to do in Oracle to achieve these goals, and examine what happens in other systems.

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