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account to transact with the Oracle database. The sales force application sets the ClientID property of all OracleConnection objects used to 'EDMUND'. When another user, Greg logs in to the application, it does the same thing; it sets the ClientID property of all OracleConnection objects used to 'GREG'. If we ve enabled auditing on the tables in this database, Oracle will automatically tag all generated audit trail records with this ClientID value. We could then retrieve the audit trail records for EDMUND (or GREG) using the SQL SELECT in Listing 2-2. Listing 2-2. Retrieving Audit Trails Using the Client Identifier

The bucket is checked for the existence of data, and if there is a record identifier, it is returned This is the essence of what a hash index is When searching for an equality condition, such as WHERE key_value = searched_value, hash indexes produce a constant O(1) efficiency5 However, in some situations, a hash index is not useful Since the hash function produces a single hashed value for each supplied key, or set of keys in a multicolumn key scenario, lookups based on a range criteria are not efficient For range searches, hash indexes actually produce a linear efficiency O(n), as each of the search values in the range must be hashed and then compared to each tuple s key hash Remember that there is no sort order to the hash table! Range queries, by their nature, rely on the underlying data set to be sorted.

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Figure 2-9. The Visual Studio tab order tool Some other properties and methods for managing the focus programmatically are described in Table 2-3.

In the case of range queries, a B-tree index is much more efficient The InnoDB storage engine implements a special type of hash index layout called an adaptive hash index You have no control over how and when InnoDB deploys these indexes InnoDB monitors queries against its tables, and if it sees that a particular table could benefit from a hash index for instance, if a foreign key is being queried repeatedly for single values it creates one on the fly In this way, the hash index is adaptive; InnoDB adapts to its environment..

Focused ContainsFocus Focus()

WHERE username = 'webUser' AND client_id = 'EDMUND' AND OBJ_NAME = 'SalesData'

Returns true if the control currently has the focus. Returns true if the control or one of its children currently has the focus. Sets the focus to the control. Note that this won t work if the control isn t visible. That means that you can t use it in an event handler for the Form.Load event, because the form isn t displayed until it is finished loading. To get around this problem, just set the TabIndex property of the control to 0 so that it will get the focus first. Sets the focus to a child control. For example, you can use Panel1.SelectNextControl() to set focus to a control inside the Panel1 container and Form1.SelectNextControl() to set focus to a control that's directly contained by the form. When you call SelectNextControl(), you supply a reference to one of the controls in the container, and the one that immediately follows in the tab order gets the focus.

Only the MyISAM storage engine supports FULLTEXT indexing. For large textual data with search requirements, this indexing algorithm uses a system of weight comparisons in determining which records match a set of search criteria. When data records are inserted into a table with a FULLTEXT index, the data in a column for which a FULLTEXT index is defined is analyzed against an existing dictionary of statistics for data in that particular column. The index data is stored as a kind of normalized, condensed version of the actual text, with stopwords6 removed and other words grouped together, along with how many times the word is contained in the overall expression. So, for long text values, you will have a number of entries into the index one for each distinct word meeting the algorithm criteria. Each entry will contain a pointer to the data record, the distinct word, and the statistics (or weights) tied to the word. This means that the index size can grow to a decent size when large text values are frequently inserted. Fortunately, MyISAM uses an efficient packing mechanism when inserting key cache records, so that index size is controlled effectively.

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