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Temporary tables are still considered a relatively new feature of Oracle, having been introduced only in Oracle8i version 8.1.5. As such, there is some confusion surrounding them, in particular in the area of logging. In 10 Database Tables, we will cover how and why you might use temporary tables. In this section, we ll explore only the question How do temporary tables work with respect to logging of changes Temporary tables generate no redo for their blocks. Therefore, an operation on a temporary table is not recoverable. When you modify a block in a temporary table, no record of this change will be made in the redo log files. However, temporary tables do generate undo, and the undo is logged. Hence, temporary tables will generate some redo. At first glance, this doesn t seem to make total sense: why would they need to generate undo This is because you can roll back to a SAVEPOINT within a transaction. You might erase the last 50 INSERTs into a temporary table, leaving the first 50. Temporary tables can have constraints and everything else a normal table can have. They might fail a statement on the fivehundredth row of a 500-row INSERT, necessitating a rollback of that statement. Since temporary tables

If you re in the process of updating a row that you fetched into a cursor, you can rest assured that no one else is updating the same row simultaneously. However, if you re executing queries, you may get different values each time if other transactions have updated data successfully in between your queries. Remember that Oracle only guarantees statement-level isolation here, not transaction-level isolation.

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time), your buffer cache efficiency goes down (you need to buffer two blocks instead of just the one you would if the rows were not migrated), and your table grows in size and complexity. For these reasons, you do not want migrated rows. It is interesting to note what Oracle will do if the row that was migrated from the block on the left to the block on the right, in Figure 10-5, has to migrate again at some future point in time. This would be due to other rows being added to the block it was migrated to and then updating this row to make it even larger. Oracle will actually migrate the row back to the original block and, if there is sufficient space, leave it there (the row might become unmigrated ). If there isn t sufficient space, Oracle will migrate the row to another block altogether and change the forwarding address on the original block. As such, row migrations will always involve one level of indirection. So, now we are back to PCTFREE and what it is used for: it is the setting that will help you to minimize row chaining when set properly.

behave in general just like normal tables, temporary tables must generate undo Since undo data must be logged, temporary tables will generate some redo log for the undo they generate This is not nearly as ominous as it seems The primary SQL statements used against temporary tables are INSERTs and SELECTs Fortunately, INSERTs generate very little undo (you need to restore the block to nothing, and it doesn t take very much room to store nothing ), and SELECTs generate no undo Hence, if you use temporary tables for INSERTs and SELECTs exclusively, this section means nothing to you It is only if you UPDATE or DELETE that you might be concerned about this.

Practical real-world databases need a compromise between concurrency access and serializable modes of operation. The key issue here is that by specifying a high degree of isolation, you can keep one transaction from affecting another, but at the cost of significant deterioration in database

performance. On the other hand, a low level of transaction isolation will introduce the data problems outlined earlier in the chapter, but it leads to better performance. A transaction running at a serializable isolation level will appear as if it s running in isolation it s as if all the other concurrent transactions run either before or after this transaction. Three of the four main ISO isolation levels allow for some deviation from the theoretical concept of serializable transactions. Table 8-1 shows the extent to which each of the four main levels of isolation suffers from the concurrency problems listed earlier. Note that a value of Yes in the table means that the particular problem is possible under that isolation level, and a value of No means that the problem isn t possible for that isolation level.

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