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Be prepared to wait for a very long time when you run most of the SQL scripts that relate to locking situations. Also, be aware that some of the scripts might sometimes make matters worse. The utllockt.sql script, for example, creates a table to store locking information, and it needs to acquire locks to create this table, which might exacerbate the locking problems that you are trying to diagnose in the first place! It s smarter to schedule these scripts using a scheduling tool or the Oracle Enterprise Manager (OEM) and arrange for database alerts when there are problem locks in the system, so you can take action to fix the problem.

Oracle uses special structures called undo records to help provide automatic statement-level read consistency. All data for a single query will come from a single point in time. Only data committed when a query begins will be seen by the query any changes made by other transactions after a query begins won t be seen by the query once it begins executing. If a transaction is modifying data, Oracle will write a before-image of the table data to its undo records. For example, if you update the salary of an employee from 10,500 to 11,000, the undo record will store the old salary value of 10,500. When a query begins execution, Oracle will determine the current system change number (SCN), which identifies the order in which transactions occurred in the database. When data blocks are read for this query, Oracle will only use data blocks with the SCN that it determined for this query. When it encounters data blocks for the query with a more recent SCN, Oracle will automatically go to the undo segments and reconstruct the data from the undo records stored there. Any changes made by other transactions during the query s execution will have more recent SCNs, and are disregarded, guaranteeing that only consistent data is returned for the query at hand.

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A common data warehousing technique I ve seen people employ goes like this: 1. They use a trigger to maintain a LAST_UPDATED column in the source table, much like the method described in the last chapter, in the Optimistic Locking section. 2. To initially populate a data warehouse table, they remember what time it is right now by selecting out SYSDATE on the source system. For example, suppose it is exactly 9:00 am right now.

Tablespaces perform a number of key functions in an Oracle database, but the concept of a tablespace is not common to all relational databases. For instance, the Microsoft SQL Server database doesn t use this concept at all. Here s a brief list of the benefits of using tablespaces: Tablespaces make it easier to allocate space quotas to various users in the database. Tablespaces enable you to perform partial backups and recoveries based on the tablespace as a unit. Because a large object like a data warehouse partitioned table can be spread over several tablespaces, you can increase performance by spanning the tablespace over several disks and controllers. You can take a tablespace offline without having to bring down the entire database. Tablespaces are an easy way to allocate database space. You can import or export specific application data by using the import and export utilities at the tablespace level.

Figure 1-19. Objects coupled through a method signature At run time, object1 becomes signature-coupled to object2, due to the method reference pointing at object2.Method1. The signature used by object1.methodReference must match the signature of object2.Method1.

Tablespaces are now used mainly to separate related groups of tables and indexes. This may be important for you if you need to transport tablespaces across different databases and platforms using the Oracle Data Pump utility, or if you use different database block sizes for different tablespaces. If you don t think you ll be performing these administrative tasks using tablespaces, you can conceivably use just a couple of tablespaces to store all the data in your database.

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