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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

The V$ASM_CLIENT view displays a row for the ASM instance if the database has open ASM files. The view displays a row for every database instance using a disk group managed by the ASM instance.

You can use the V$ASM_DISK view to check the performance of disks in an ASM system. The V$ASM_DISK view only displays rows for disks in disk groups that the instance is using. In an ASM instance, the view displays a row for every disk discovered by the ASM instance, including disks that aren t part of any disk group. The V$ASM_DISK_STAT view provides the same information, but without performing a discovery of new disks.

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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.

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 V$ASM_DISKGROUP view shows information regarding ASM disk groups. The view displays a row for every ASM disk group mounted by the local ASM instance. In an ASM instance, the view displays a row for every disk group discovered by the ASM instance. The V$ASM_DISKGROUP_STAT view shows the same information as the V$ASM_DISKGROUP view, but doesn t perform a discovery of new disk groups.

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

The V$ASM_FILE view applies only to an ASM instance, and not a normal database instance. In an ASM instance, the view displays a row for every ASM file in every disk group mounted by the ASM instance. The V$TEMPLATE view shows template information for every template in every disk group in an ASM-based instance.

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.

The V$ASM_OPERATION view applies only to an ASM instance, and shows the progress of a longrunning ASM operation running in an ASM instance.

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