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As you work through the examples in this book, you may decide that you prefer to type in all the code by hand. Many readers choose to do this because it is a good way to get familiar with the coding techniques that are being used. Whether you want to type the code in or not, all the source code for this book is available in the Source Code section of the Apress web site (http://www.apress.com). If you like to type in the code, you can use the source code files to check the results you should be getting they should be your first stop if you think you might have typed in an error. If you don t like typing, then downloading the source code from the Apress web site is a must! Either way, the code files will help you with updates and debugging.

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.

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A Data Pump job creates all its dump files on the server, not on the client machine where a job may have originated. Oracle background processes are responsible for all dump file set I/O, on behalf of the Oracle software owner (usually, the user oracle). This means that for security reasons, you can t let any user specify an absolute file path on the server. In addition to a possible violation of security, there is the matter of safety, as you can unwittingly overwrite a server file if you are given the power to write dump files anywhere on the system. Similarly, you ll be able to read all files that the server has access to, even though you may not have been granted specific privileges to do so. To avoid these types of problems, Data Pump uses directory objects.

The goal here was to find all of the rows in T where x was NULL if some condition was not met or where x equaled a specific value if some condition was met The complaint was that, in Oracle, this query would return no data when L_SOME_VARIABLE was not set to a specific value (when it was left as NULL) In Sybase or SQL Server, this was not the case the query would find the rows where x was set to a NULL value I see this on almost every conversion from Sybase or SQL Server to Oracle SQL is supposed to operate under tri-valued logic and Oracle implements NULL comparisons the way ANSI SQL requires them to be implemented Under those rules, comparing x to a Null is neither true nor false it is, in fact, unknown.

Your Data Pump Export and Import jobs will not run unless you create a directory object first. Subsequently, you must also ensure that the user has the necessary file and directory access privileges on that file system.

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 us to wait indefinitely. 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, then that person s lock request will fail (and the error resource busy will be raised):

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