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Oracle Forms will generate an UPDATE statement that includes only the changed columns (not the primary key) Problems arising from deletion of a row in a parent table are far more common As I demonstrated, if I delete a row in table P, then the child table, C, will become locked during the DML operation, thus preventing other updates against C from taking place for the duration of the transaction (assuming no one else was modifying C, of course; in which case the delete will wait) This is where the blocking and deadlock issues come in By locking the entire table C, I have seriously decreased the concurrency in my database to the point where no one will be able to modify anything in C In addition, I have increased the probability of a deadlock, since I now own lots of data until I commit.

public class BusinessClass { void businessMethod1() { // business logic... } void businessMethod2() throws BusinessException { // business logic... throw new BusinessException(); } }

If you allowed each user to perform just a parallel 2 query, you would now have 64 concurrent operations taking place on a machine with just four CPUs If the machine was not overwhelmed before parallel execution, it almost certainly would be now In short, parallel execution can also be a terrible idea In many cases, the application of parallel processing will only lead to increased resource consumption, as parallel execution attempts to use all available resources In a system where resources must be shared by many concurrent transactions, such as in an OLTP system, you would likely observe increased response times due to this.

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The probability that some other session will become blocked on C is now much higher; any session that tries to modify C will get blocked Therefore, I ll start seeing lots of sessions that hold some preexisting locks on other resources getting.

It avoids certain execution techniques that it can use efficiently in a serial execution plan and adopts execution paths such as full scans in the hope that by performing many pieces of the larger, bulk operation in parallel, it would be better than the serial plan Parallel execution, when applied inappropriately, may be the cause of your performance problem, not the solution for it So, before applying parallel execution, you need the following two things to be true: You must have a very large task, such as the full scan of 50GB of data You must have sufficient available resources Before parallel full scanning 50GB of data, you want to make sure that there is sufficient free CPU to accommodate the parallel processes as well as sufficient I/O The 50GB should be spread over more than one physical disk to allow for many concurrent read requests to happen.

blocked in the database If any of these blocked sessions are, in fact, locking a resource that my session also needs, we will have a deadlock The deadlock in this case is caused by my session preventing access to many more resources (in this case, all of the rows in a single table) than it ever needed When someone complains of deadlocks in the database, I have them run a script that finds unindexed foreign keys, and 99 percent of the time we locate an offending table By simply indexing that foreign key, the deadlocks and lots of other contention issues go away.

public class BusinessException extends Exception { }

simultaneously, there should be sufficient I/O channels from the disk to the computer to retrieve the data from disk in parallel, and so on. If you have a small task, as generally typified by the queries carried out in an OLTP system, or you have insufficient available resources, again as is typical in an OLTP system where CPU and I/O resources are often already used to their maximum, then parallel execution is not something you ll want to consider. So you can better understand this concept, I present the following analogy.

The following example demonstrates the use of this script to locate the unindexed foreign key in table C: ops$tkyte@ORA10G> column columns format a30 word_wrapped ops$tkyte@ORA10G> column tablename format a15 word_wrapped ops$tkyte@ORA10G> column constraint_name format a15 word_wrapped ops$tkyte@ORA10G> select table_name, constraint_name, 2 cname1 || nvl2(cname2,','||cname2,null) || 3 nvl2(cname3,','||cname3,null) || nvl2(cname4,','||cname4,null) || 4 nvl2(cname5,','||cname5,null) || nvl2(cname6,','||cname6,null) || 5 nvl2(cname7,','||cname7,null) || nvl2(cname8,','||cname8,null) 6 columns 7 from ( select btable_name, 8 b.

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