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The column EMPL_NUM in the subquery of the preceding example is such an outer reference; it refers to the EMPL_NUM column in the row of the SALESREPS table currently being checked by the UPDATE statement The subquery in this example is a correlated subquery, as described in 9 Outer references will often be found in subqueries of an UPDATE statement, because they implement the "join" between the table(s) in the subquery and the target table of the UPDATE statement The same SQL1 restriction applies as for the DELETE statement: the target table cannot appear in the FROM clause of any subquery at any level of nesting This prevents the subqueries from referencing the target table (some of whose rows may have already been updated).

Thus far, we ve looked at some of the different ways data can be protected from a management level. Now, it s time to discuss the issues associated with real-world hardware and software options. Evaluating data protection hardware and software solutions can be quite confusing. We won t be going into much technical detail in this chapter, though. We ll limit ourselves to the depth of information that is necessary to form a good data protection plan, and leave the details to 5, Evaluating Data Protection Solutions.

The information in a dimensional schema may serve a variety of groups and purposes. In many cases, analytic requirements will not call for access to all information contained in the schema. When only a subset of the data is called for, a derived schema may be useful. This is most helpful in distributed, departmental, or mobile solutions, where limiting data set size is an advantage. For example, sales data being replicated to regional offices need not include the entire contents of a star. The amount of data propagated to each region can be limited to the region s own transactions. The size of the data set is reduced without sacrificing detail. The same principle can be used to enforce a role-based security requirement. Derived schemas can be produced that are limited to what particular groups are permitted to access. For example, a sliced fact table, as presented later in this chapter, may be used to provide order data for a particular region only.

Any references to the target table in the subqueries are thus outer references to the row of the target table currently being tested by the UPDATE statement's WHERE clause The SQL2 standard again removed this restriction and specifies that a reference to the target table in a subquery is evaluated as if none of the target table had been updated..

The central concept behind performing backups is to move information into less expensive, removable forms of storage. Economy and efficiency are the objectives behind this idea. Backup hardware comes in many shapes and forms. Traditionally, when systems administrators heard the phrase backup and recovery, they thought tape drives. Tape-based media has many advantages and can meet business requirements. Several years ago, when hard drives were relatively expensive, tape backup units offered large storage capacities and good performance. Of course, there are tradeoffs: Tape media usually is not randomly accessible. Thus, if you need to access a piece of data in the middle of a tape, you may spend a large percentage of your time simply finding the data. Consequently, running applications or accessing data files regularly from tape is prohibitively slow.