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The V$BGPROCESS view shows you all the background processes available, even if some of them aren t currently running in your instance.

123 456 ... 987

The new V$OSSTAT view comes in handy when you wish to check system usage statistics. 22 shows how to use this view to gather system usage statistics.

You can ask Oracle to monitor the usage of an index to determine if you need the index after all. The V$OBJECT_USAGE dynamic view holds the results of the index usage monitoring. The following code shows the structure of the V$OBJECT_USAGE view. You need to watch the key column USED to see if a certain index is being used or not during the monitoring period. SQL> DESC V$OBJECT_USAGE Name ----------------------INDEX_NAME TABLE_NAME MONITORING USED START_MONITORING END_MONITORING SQL>

Perhaps the P1 caller gains access to this information one piece at a time, from a third party, or perhaps the communication channel between P1 and P2 can only handle messages of a certain size.

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So, two of those rows are locked If anyone tried to update them, that user would be blocked So far, the behavior we are seeing is more or less consistent across all databases The difference will be in what happens when the query gets to the locked data When the query we are executing gets to the block containing the locked row (row 342,023) at the bottom of the table, it will notice that the data in the row has changed since the time at which it started execution To provide a consistent (correct) answer, Oracle will at this point create a copy of the block containing this row as it existed when the query began That is, it will read a value of $10000, which is the value that existed at the time the query began.

When you re dealing with issues such as I/O distribution among your data files, for example, the dynamic views pertaining to storage objects are quite useful. In the following sections you ll look at the main storage-related dynamic views.

The V$DATAFILE view contains information about the data-file name, the tablespace number, the status, the time stamp of the last change, and so on. The V$TEMPFILE view shows you particulars about the temporary tablespace files. The V$DATAFILE view provides important information when you join it to the V$FILESTAT view.

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.

The V$FILESTAT view provides you with detailed data on file read/write statistics, including the number of physical reads and writes, the time taken for that I/O, and the average read and write times in milliseconds. The V$TABLESPACE view provides information about the tablespaces. Listing 23-38 shows how you can join the V$DATAFILE, V$TABLESPACE, and V$FILESTAT views to obtain useful disk I/O information.

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