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Assuming that past solutions always work Prior experience can shorten the time to solve a recurring problem because you already know the remedy However, the same solution might not always solve a problem that looks familiar Always verify the symptoms before acting If your initial assumptions are incorrect and you misdiagnose the problem, your actions might make the situation worse Keep an open mind when troubleshooting When in doubt, verify your information by searching technical information sources (including technical support) and obtain advice from experienced colleagues Do not ignore new information, and question past procedures that seem inappropriate..

ICF is a basic firewall product that blocks traffic; however, it does not meet every possible need, and it does not protect you from every possible threat. For example: e-mail viruses, and worms are not detected by ICF. You need to use antivirus software with ICF for complete protection against these dangers.

The first line can be translated as give us all (*) rows in the Customer table (designated by the asterisk, which is a wildcard character in SQL), or less formally, give us the list of customers. The second line can be translated as a request to give us the total of all rows contained in the Product table in other words, a count of how many products this company has. When you issue a SQL query to a relational database, the database returns a result set that simply contains the rows with the answers to your query. Using SQL, you can also group or aggregate the results of a query. You also use SQL to create tables or delete (drop) tables. You ve learned about primary keys, foreign keys, and constraints, but you probably didn t know that they re also created using SQL. It s also good to know that SQL is an ANSI/ISO standard; therefore, any RDBMS producer needs to obey a set of rules. Basic SQL is a base programming language and as such is usually not sufficient to solve all the possible problems or provide all the analysis needs that an application might demand. It has a rather limited set of keywords. Because the first goal is to query data from a database, the most popular RDBMSs on the market have added extensions to SQL to permit the addition of procedural code. These additions turn SQL into a full-fledged programming language that helps solve more complex problems. The following are popular extensions and their manufacturers: Microsoft Transact-SQL (T-SQL), Oracle PL/SQL, and IBM SQL PL. Recently, in addition to these extensions, RDBMS manufacturers have added support

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Neglecting to check the basics A user cannot print to a new local inkjet printer. You verify cable and power connections, check the ink cartridge, and run the printer s built-in diagnostics, but you find nothing wrong. Windows XP Professional cannot detect the printer, so you manually install the most recent drivers without success. Reinstalling Windows XP Professional does not solve the problem, and you later realize that you neglected to find out whether printing to any local printer from this computer has ever been successful. You find that the user has never tried this, and a firmware check reveals that the parallel port is disabled. Enabling the parallel port resolves all printing problems.

System setting changes do not always take effect immediately. For example, when troubleshooting replication issues, you must wait to observe changes. If you do not allow adequate time to pass, you might prematurely conclude that the change was not effective. To avoid this situation, familiarize yourself with the feature that you are troubleshooting and thoroughly read the information provided by technical support before judging the effectiveness of a workaround or update.

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Documenting the steps that you take while troubleshooting allows you to review your actions after you have resolved the problem. This is useful for very complex problems that require lengthy procedures to resolve. Documenting your steps allows you to verify that you are not duplicating or skipping steps, and it enables others to assist you with the problem. It also allows you to identify the exact steps to take if the problem recurs and enables you to evaluate the effectiveness of your efforts.