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CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
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Indexes are related to PostgreSQL performance tuning, so we ll mention them only briefly here. Indexes are database objects meant to increase the overall speed of database operations. Indexes work on the presumption that the vast majority of database operations are read operations. Indexes increase the speed of search operations but slow down insert, delete, and update operations. Usually, the gains of using indexes considerably outweigh the drawbacks. On a table, you can create one or more indexes, with each index working on one column or on a set of columns. When a table is indexed on a specific column, its rows are either indexed or physically arranged based on the values of that column and the type of index. This makes search operations on that column very fast. If, for example, an index exists on department_id and then you do a search for the department with the ID value 934, the search would be performed very quickly. The drawback of indexes is that they can slow down database operations that add new rows or update existing ones because the index must be actualized (or the table rows rearranged) each time these operations occur. You should keep the following in mind about indexes: Indexes greatly increase search operations on the database, but they slow down operations that change the database (delete, update, and insert operations). Having too many indexes can slow down the general performance of the database. The general rule is to set indexes on columns frequently used in WHERE, ORDER BY, and GROUP BY clauses or used in table joins. By default, unique indexes are automatically created on primary key table columns. You can use dedicated tools to test the performance of a database under stress conditions with and without particular indexes; in fact, a serious database administrator will want to run some of these tests before deciding on a winning combination for indexes.
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Creating the department Table
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You created the hatshop database in 2. In the following exercise, you ll add the department table to it using pgAdmin III. Alternatively, you can use the SQL scripts from the Source Code/Download to create and populate the department table (you can also execute them through pgAdmin III).
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Note You can find the database creation scripts in the Source Code/Download section for this book,
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which you can find on the Apress web site (http://www.apress.com). You can find the files on the authors web sites as well, at http://www.cristiandarie.ro and http://www.emilianbalanescu.ro.
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CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
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Exercise: Creating the department Table
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1. Start pgAdmin III, and log into your database server using the hatshopadmin username, as you did in the last exercise of 2. 2. Expand the hatshop database node, expand Schemas, expand public, and then select the Tables node. Right-click this node, and choose New Table from the context menu. 3. Type department in the Name text box, and then click the Columns tab. 4. In the Columns window, click Add. Complete the details as shown in Figure 3-10, and then click OK.
Figure 3-10. Adding the department_id field 5. Click Add again to add the name field, as shown in Figure 3-11.
CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
Figure 3-11. Adding the name field 6. Click Add again to add the description field. This should also be a varchar field, with a maximum length of 1000. Let the Not NULL check box stay unchecked, and click OK. 7. The final step for creating the table is to specify a primary key. Click the Constraints tab, make sure Primary Key is selected in the combo box, and click Add. 8. Type pk_department for the key s name, then switch to the Columns tab, and add department_id to the list. Click OK to close the dialog box. 9. Click OK again to create the table. Your new table should now appear in the Tables list of your database (see Figure 3-12). As you can see, apart from your new table, there are a few tables created by default by PostgreSQL it s safe to ignore them. If you select the department table from the list, pgAdmin III shows you the SQL code that creates the structure you ve just built using the visual interface. You can check that you see the same code on your computer to ensure you ve followed the steps of the exercise correctly.
Note You ll learn more about SQL in the following chapters, but for now it s enough to know that SQL is
a language that can be used to interact with the database, to create data tables, to read data from these tables, and so on.
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