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APPENDIX B DATA DICTIONARY OVERVIEW
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DBA_UPDATABLE_COLUMNS DBA_USERS DBA_VIEWS DBA_WAITERS
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All columns of updatable join views Information about all users Description of all views All sessions waiting for something (locks)
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V$ Views: Dynamic Performance Views
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Table B-6 lists the dynamic performance views. You need DBA privileges (or some specific system privileges) to access these views. Table B-6. V$ Data Dictionary Views
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V$BGPROCESS V$CONTROLFILE V$DATABASE V$DATAFILE V$ENABLEDPRIVS V$FILESTAT V$FIXED_TABLE V$FIXED_VIEW_DEFINITION V$INSTANCE V$LICENSE V$LOCK V$MYSTAT V$NLS_PARAMETERS V$NLS_VALID_VALUES V$OPTION V$PARAMETER V$PROCESS V$RESERVED_WORDS V$SESS_IO V$SESSION V$SESSION_EVENT V$SESSION_LONGOPS V$SESSION_WAIT
Description
The Oracle background processes The names of the control files Information about the database from the control file Information about the data files from the control file Enabled privileges I/O activity per data file Displays all dynamic performance tables, views, and derived tables Displays the definitions of all the fixed views Status information about the instance Information about license limits Information about active locks Statistics for the current session Current NLS parameter values All valid values for NLS parameters The installed Oracle options Current initialization parameter values for the session Information about all active processes All keywords used by the PL/SQL compiler (a superset of the SQL reserved words) I/O statistics for all active sessions Information about all active sessions Information about waits for an event by a session Status of operations that run for longer than 6 seconds Resources or events for which active sessions are waiting
APPENDIX B DATA DICTIONARY OVERVIEW
View Name
V$SESSTAT V$SGA V$SGASTAT V$SPPARAMETER V$SQL V$SQLAREA V$SQL_PLAN V$SQL_PLAN_STATISTICS V$SQLTEXT V$SQLTEXT_WITH_NEWLINES V$SYSSTAT V$SYSTEM_PARAMETER V$TABLESPACE V$TIMER V$TIMEZONE_NAMES V$TRANSACTION V$VERSION V$WAITSTAT
Description
User session statistics Information about the shared global area (SGA) Detailed information about the SGA components Information about the contents of the server parameter file Detailed information about SQL statements in memory Aggregated information about SQL statements in memory Execution plan information for SQL statements in memory Execution statistics of SQL statements in memory The text of SQL statements in memory Same as V$SQLTEXT, with improved legibility All system statistics Information about the initialization parameters in effect Information about all tablespaces Internal clock, in hundredths of a second List of names and abbreviations of time zones Information about all active transactions Version information about installed Oracle products Block contention statistics
APPENDIX
The Seven Case Tables
his appendix offers an overview of the seven case tables used throughout this book, in various formats. Its main purpose is to help you in writing SQL commands and checking your results. The first section shows an Entity Relationship Modeling (ERM) diagram, indicating the entities of the underlying data model, including their unique identifiers and their relationships. Then you can find descriptions of the seven case tables, with names and datatypes of all their columns and short explanations, when necessary. The next section shows a table diagram, focusing on all primary key and foreign key constraints. This diagram may be especially helpful when you are writing joins. The biggest component of this appendix (with the highest level of detail) is a complete listing of the seven case tables with all their rows. This overview may be useful to check your query results for correctness. At the end of this appendix, you will find two alternative representations of the case table data, showing the table rows in a compact format. The first diagram shows an overview of the 14 employees. It clearly shows the department populations and the hierarchical (manager/subordinate) relationships. The second illustration shows a matrix overview of all course offerings, with starting dates, locations, attendees (A), and trainers (T). Again, these representations may be useful to check your query results for correctness. You can also find information about the case tables within this book, as follows:
Location
1.9 Case Tables 3.4 Creating the Case Tables 7.4 Constraints
Comments
First introduction Simple CREATE TABLE commands (without constraints) Full CREATE TABLE commands (with constraints)
APPENDIX C THE SEVEN CASE TABLES
ERM Diagram
The ERM diagram, shown in Figure C-1, shows the seven entities (the rounded-corner boxes) with their unique identifiers and their mutual relationships. The ten crow s feet indicate one-to-many relationships. The diagram shows two types of one-to-many relationships: three relationships are completely optional (indicated by all dashed lines) and the remaining ones are mandatory in one direction (indicated by the solid part of the line).
Figure C-1. ERM diagram of the case entities Hash signs (#) in front of an attribute mean that the attribute is part of the unique identifier; relationship cross-lines indicate that the relationship is part of the unique identifier. Note that the diagram shows only attributes that are part of unique identifiers, for enhanced readability. You can interpret the relationships in this diagram as follows: Every employee has at most one manager (and employees may have multiple subordinates). Every employee belongs to precisely one salary grade and is employed by at most one department (employees without a department are allowed). Each department has precisely one manager (and employees may be manager of multiple departments). Each course offering refers to precisely one existing course, with at most one employee as trainer. Each registration is for precisely one employee and for precisely one course offering. Each history record refers to precisely one employee and precisely one department.
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