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Lesson 6

Database Software Conclusion

In this module you explored the basic components that make up the Oracle database software.
You saw how Oracle's software is divided into server-side components and client-side components. The meta-data stored in Oracle’s data dictionary views was described and the most commonly used views were outlined for you. You logged into the Oracle database using a simulator that imitates an actual session in SQL*Plus.
You discovered that Oracle’s implementation of SQL includes all the standard SQL plus specialized extensions to SQL that run exclusively in Oracle. While it is not usually necessary to distinguish between standard and Oracle-extended SQL while working with Oracle, you learned how to adjust the SQL*Plus environment using the FLAGGER to mark queries that contain Oracle extensions. This way, if you need to create portable code, you do not have to pore over manuals to figure out what’s standard and what’s beyond the standard SQL implementation.
In this module, you learned how to:
  1. Identify the primary components of an Oracle database
  2. Name several data dictionary views and their purpose
  3. Log into the database with SQL*Plus
  4. Distinguish between standard SQL and Oracle's SQL extensions and describe when to use each

SQL Extensions Glossary

In this module you were introduced to the following glossary terms:
  1. ODBC - Open Database Connectivity: A set of standards that define communication protocol and syntax to be used when interacting with any relational database.
  2. JDBC - Java Database Connectivity: A set of standards defining a standard protocol and syntax in Java applications or applets to interact with any relational database.
  3. Tablespace: Logical storage space within the Oracle database. Each tablespace is mapped to one or more physical data files. Each tablespace stores one or more tables, indexes, or other objects created within the database. A table is assigned to a single tablespace when the table is created except where you have created a partitioned table.
  4. Instance: One row in an object table.
  5. Schema: All the tables, views, and other objects created by a single Oracle user.
    The schema has the same name as the creating user, such as the SCOTT schema.
  6. Meta-data Information (data) about database structures. For example, the meta-data about a table includes its name, its column names, and the tablespace in which it resides.
  7. Data dictionary views: Oracle views that display meta-data.
In the next module you will move into some new and more advanced techniques for writing queries and explore some of the Oracle extensions to standard SQL that add power to your query-writing technique.

Oracle Extensions - Quiz

Click the Quiz link below to take a multiple-choice quiz about SQL*Plus and Oracle's extensions to SQL.
Oracle Extensions - Quiz