Oracle Practice Test - 21

The SGA (System Global Area) is a shared memory region in Oracle that includes the Database Buffer Cache, Redo Log Buffer, and Shared Pool - all of which are accessible by multiple processes. PGA (Program Global Area) is private memory specific to each server process and is NOT part of the SGA. Each Oracle process has its own PGA containing session-specific variables and runtime areas.

DBA_SEGMENTS is the correct view because it contains information about ALL segments allocated to a user, including both tables and indexes. Tables and indexes are both stored as segments in the database. DBA_TABLES and DBA_INDEXES would require querying two separate views and joining them. DBA_TABLESPACES shows tablespace information, not user-specific object locations. DBA_SEGMENTS provides a comprehensive view of all storage segments owned by a user.

Fine-grained auditing allows conditional audit policies based on specific column access or access conditions. Option A correctly uses FGA to track internet-based access to sensitive customer address data while allowing internal access. Option B demonstrates FGA's alert capability for specific high-value columns like executive salaries. Option C describes standard value-based auditing using triggers, not FGA. Option D and E describe standard table-level auditing which doesn't require FGA's granularity.

A database job is marked BROKEN after 16 consecutive failed executions. This is Oracle's default threshold to prevent repeatedly failing jobs from continuing to consume system resources and clutter the job queue.

Step Over executes the current line and advances to the next line in the current program unit. When debugging and you want to continue through code without stepping into called subprograms, Step Over keeps you at the same level of the call stack.

Step Over executes the entire subprogram without stepping through its internal lines, then returns control to the line immediately after the subprogram call. This is exactly what SMITH needs when he realizes the error is in code after the subprogram, not within it.

The ORA-01427 error occurs when a subquery that should return only one row returns multiple rows. The IN operator is designed to handle multiple values and eliminates this error by checking if a value exists in the result set rather than requiring equality with a single row.

The SHRINK SPACE operation compacts data and can release free space, but it requires exclusive locks on segments. During this operation, DML (Data Manipulation Language) operations like INSERT, UPDATE, DELETE are blocked, causing an impact on database operations.

Oracle Forms (standard) runs PL/SQL code on the client side in the Forms runtime, while Oracle Apps Forms (E-Business Suite) runs PL/SQL server-side for better performance, security, and centralized business logic management.

SMON (System Monitor), PMON (Process Monitor), and CKPT (Checkpoint) are all core background processes in Oracle. SMON handles instance recovery, PMON cleans up failed processes, and CKPT updates checkpoint information in control files.

V$TRANSPORTABLE_PLATFORM shows which platforms can cross-transport tablespaces. It lists platforms and their endian formats, allowing you to verify compatibility between source and target databases before attempting transportable tablespace operations.

When a user creates an object without specifying a tablespace, Oracle stores it in that user's default tablespace. This is set at user creation time with the DEFAULT TABLESPACE clause or inherited from the database default.

Oracle allows 12 triggers per table: one BEFORE and one AFTER for each of the six operations (INSERT, UPDATE, DELETE, plus their row-level variants INSERT ROW, UPDATE ROW, DELETE ROW). This gives maximum flexibility for enforcing business rules at different execution points.

When a client abnormally terminates, PMON (Process Monitor) automatically detects the failed session, rolls back the uncommitted transaction, releases locks, and frees resources. No manual intervention by the DBA is needed - PMON handles this cleanup automatically.

Oracle Database implements alert throttling to prevent alert flooding. For undo segment alerts, the system sends at most one alert per 24-hour period, even if multiple undo-related issues occur. This prevents administrators from being overwhelmed by redundant notifications for the same type of issue. Options A, C, and D incorrectly state the time period or alert type.

When an Oracle client process terminates abnormally, the PMON (Process Monitor) background process automatically detects the failure and rolls back any uncommitted transactions. PMON releases all resources and locks held by the terminated transaction, making them available to other sessions. This is automatic instance recovery at the transaction level. Option A is incorrect because archived redo logs are for media recovery, not transaction rollback. Option B is incorrect because instance recovery doesn't help with incomplete user transactions. Option D is incorrect because point-in-time recovery would lose committed work.

An equijoin is a join based on equality between columns from two tables. Option A shows the classic equijoin syntax using a WHERE clause with the equality operator (=) to match location.id with employee.location_no. Option B uses a BETWEEN range condition, not equality. Option C uses >= which is a non-equal comparison. Option D uses the outer join operator (+), which creates an outer join, not an equijoin.

SQL operator precedence ensures multiplication always happens before addition, regardless of parentheses. The expression (.15e.salary) + (.5e.commission_pct) + (s.sales_amount * (.35*e.bonus)) evaluates identically without parentheses because all multiplication operations occur before any addition operations. The nesting of parentheses doesn't change this fundamental precedence rule. Options A and B are incorrect because the value remains the same. Option D is incorrect because no error occurs.

Oracle SQL supports ON DELETE CASCADE for foreign key constraints, which automatically deletes child rows when the parent row is deleted. However, Oracle does not support ON UPDATE CASCADE - this is a MySQL-specific feature. If you need to update primary key values, you must manually update all dependent foreign key values or recreate the rows. Options A, C, and D are all supported Oracle SQL statements.