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Using gfix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 835 Sweeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 837 Shutting Down a Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 839

To illustrate the magnitude of the effect of adding length-checking constraints to character columns in a Unicode database, I have constructed the following simple test. 1. Create two tables with 20 columns of type VARCHAR2, identical except that only one should have the length-checking constraints on the character columns.

Changing Database Settings 842 Data Validation and Repair 846 Transaction Recovery 847 Shadows 849 Summary of gfix Switches 850 gfix Error Messages 853 Up Next 853.

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If you are unfamiliar with query plans, you are probably quite confused about how all of this syntax translates to a plan. A little later, the syntax will make more sense when we take a look at some plans generated by the optimizer. However, at this point, it will be helpful to examine how the optimizer evaluates the materials for its operations: the join and search conditions requested in the statement, the streams underlying the query specification, and the indexes that are available.

The objective of the optimizer is to establish a plan that reflects the strategy that, according to several factors, is likely to start returning the output stream fastest. The

evaluation may be quite imprecise, using several variables that are no more than rough estimates. Factors considered include Availability of an index and the selectivity of that index. The selectivity factor used in estimates is that read from the system tables when the database was opened. Even at startup, it may not be accurate and it may have been altered due to distribution changes in operations since the last selectivity was computed. The cardinality (number of rows) in the table streams. Whether there are selection criteria and, if so, whether an index is available or is suitable. The need to perform sorts, both intermediate (for merges) and final (for ordering and grouping).

1. If you want to see this yourself, you can temporarily set this parameter on a test database. Even if your Oracle database is not in Unicode, PeopleSoft will build the DDL for Unicode.

The term stream that crops up in discussions about the optimizer is merely a generic way to refer to a set of rows. The set might be all of the rows and columns in a table, or it might be a set from a table that is restricted in some way by column specifications and search conditions. During the evolution of a query, the engine may create new streams from contributing stream, such as an internal, sorted set or a set of subqueried values for an IN( ) comparison. See also the upcoming Rivers section.

In queries, the Firebird engine can use an index for three kinds of tasks: Equality comparisons: These perform an equality, greater than, less than, or STARTING WITH comparison between the value in a column and a constant. If the column is indexed, the index key is used to eliminate ineligible rows, making it unnecessary to fetch and scan unwanted rows of table data just to eliminate them. Matching streams for joins: If an index is available for the columns named as the join condition for the stream on one side of the join, the stream on the other side is retrieved first and its join columns are matched with the index. Sorting and grouping: If an ORDER BY or GROUP BY condition specifies a column that has an index, the index is used to retrieve the rows in order and a sort operation is not required.

22

When join criteria can be matched to an indexed column, the Firebird engine generates a bitmap of each stream selected. Subsequently, using AND and OR logic in accordance with the search criteria, the individual bitmapped row streams are combined into a single bitmap that describes all of the eligible rows. When the query needs to scan the same stream in multiple passes, scanning the bitmap is much faster than revisiting the indexes.

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