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There are few times when an INSERT will block. The most common scenario is when you have a table with a primary key or unique constraint placed on it and two sessions attempt to insert a row with the same value. One of the sessions will block until the other session either commits (in which case the blocked session will receive an error about a duplicate value) or rolls back (in which case the blocked session succeeds). Another case involves tables linked together via referential integrity constraints. An INSERT into a child table may become blocked if the parent row it depends on is being created or deleted. Blocked INSERTs typically happen with applications that allow the end user to generate the primary key/unique column value. This situation is most easily avoided by using a sequence or the SYS_GUID() built-in function to generate the primary key/unique column value. Sequences/SYS_GUID() were designed to be highly concurrent methods of generating unique keys in a multiuser environment. In the event that you cannot use either and must allow the end user to generate a key that might be duplicated, you can use the following technique, which avoids the issue by using manual locks implemented via the built-in DBMS_LOCK package.

Basic NTP configuration will vary depending on what s being configured: server, client, or peer. There will also be variation as a function of the operating system. But in general, the basic configuration allows a client to receive updates from a server, a server to offer updates, and peers to exchange updates. Basic NTP configuration would not address NTP security or redundancy.

Note The following example demonstrates how to prevent a session from blocking on an insert statement ( )

If the object is then loaded with data from the database, the _isNew field is set to False, through a protected MarkOld() method: Protected Overridable Sub MarkOld() _isNew = False MarkClean() End Sub

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due to a primary key or unique constraint. It should be stressed that the fix demonstrated here should be considered a short-term solution while the application architecture itself is inspected. This approach adds obvious overhead and should not be implemented lightly. A well-designed application would not encounter this issue. This should be considered a last resort and is definitely not something you want to do to every table in your application just in case.

With inserts, there s no existing row to select and lock; there s no way to prevent others from inserting a row with the same value, thus blocking our session and causing an indefinite wait. Here is where DBMS_LOCK comes into play. To demonstrate this technique, we will create a table with a primary key and a trigger that will prevent two (or more) sessions from inserting the same values simultaneously. The trigger will use DBMS_UTILITY.GET_HASH_VALUE to hash the primary key into some number between 0 and 1,073,741,823 (the range of lock ID numbers permitted for our use by Oracle). In this example, I ve chosen a hash table of size 1,024, meaning we will hash our primary keys into one of 1,024 different lock IDs. Then we will use DBMS_LOCK.REQUEST to allocate an exclusive lock based on that ID. Only one session at a time will be able to do that, so if someone else tries to insert a record into our table with the same primary key, that person s lock request will fail (and the error resource busy will be raised):

Notice that this process also sets the object to a clean status a concept discussed later in this chapter when I discuss the IsDirty property. When an object s data has just been loaded from the database, it is safe to assume that the object s data matches the data in the database and has not been changed and thus is clean.

Note To successfully compile this trigger, execute permission on DBMS_LOCK must be granted directly to your

I strongly recommend using the default location; doing otherwise defeats the simplicity SPFILEs represent. When an SPFILE is in its default location, everything is more or less done for you. Moving the SPFILE to a nondefault location means you have to tell Oracle where to find the SPFILE, leading to the original problems of legacy parameter files all over again!

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