McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Bachelor of Science in Computer Science FY (BSc CS) , Bachelor of Science in Computer Science SY (BSc CS) , Bachelor of Science in Information Technology SY (BSc IT) , Bachelor of Computer Applications (BCA) .
Chapters
| 1301. |
Which of the following is the default trigger that is created using the CREATE TRIGGER command? |
| A. | Row level Trigger |
| B. | Statement level Trigger |
| C. | BEFORE Trigger |
| D. | AFTER Trigger |
| Answer» B. Statement level Trigger | |
| 1302. |
Which of the following command is used to delete a trigger? |
| A. | DELETE TRIGGER |
| B. | REPLACE TRIGGER |
| C. | DROP TRIGGER |
| D. | None of the above |
| Answer» C. DROP TRIGGER | |
| 1303. |
What is the name of a trigger that initiates another trigger? |
| A. | Triggering Trigger |
| B. | Automatic Initiation Trigger |
| C. | Cascading Trigger |
| D. | None of the above |
| Answer» C. Cascading Trigger | |
| 1304. |
Which of the following specifies a boolean expression that must be true for the trigger to fire? |
| A. | Trigger Action |
| B. | Triggering Event |
| C. | Trigger Restriction |
| D. | None of the above |
| Answer» C. Trigger Restriction | |
| 1305. |
Which of the following trigger will be executed before modifying each row affected by the triggering statement? |
| A. | Before Statement Trigger |
| B. | After Row Trigger |
| C. | Before Row Trigger |
| D. | None of the above |
| Answer» C. Before Row Trigger | |
| 1306. |
Which of the following is not true in case of triggers? |
| A. | Triggers accept parameters. |
| B. | Triggers are executed implicitly |
| C. | Execution of triggers is transparent to the users. |
| D. | A trigger can invoke another trigger. |
| Answer» A. Triggers accept parameters. | |
| 1307. |
A database is divided into logical storage units called as |
| A. | Tables |
| B. | Records |
| C. | Tablespaces |
| D. | None of the above |
| Answer» C. Tablespaces | |
| 1308. |
A file used to govern the initialization of the instance is known as |
| A. | Shared file |
| B. | Parameter file |
| C. | Read-only file |
| D. | None of the above |
| Answer» B. Parameter file | |
| 1309. |
SGA stands for |
| A. | System Go Ahead |
| B. | Software Global Area |
| C. | System Global Area |
| D. | None of the above |
| Answer» C. System Global Area | |
| 1310. |
Under which two circumstances do you design database triggers? (Choose two) |
| A. | To duplicate the functionality of other triggers. |
| B. | To replicate built-in constraints in the Oracle server such as primary key and foreign key. |
| C. | To guarantee that when a specific operation is performed, related actions are perform |
| Answer» C. To guarantee that when a specific operation is performed, related actions are perform | |
| 1311. |
This statement fails when executed: CREATE OR REPLACE TRI GGER CALC_TEAM_AVG AFTER I NSERT ON PLAYER BEGIN INSERT INTO PLAYER_BATSTAT ( PLAYER_I D, SEASON_YEAR, AT_BATS, HI TS) VALUES ( : NEW. I D, 1 997, 0, 0) ; END; To which type must you convert the trigger to correct the error? |
| A. | Row |
| B. | Statement |
| C. | ORACLE FORM trigger |
| D. | Before |
| Answer» A. Row | |
| 1312. |
The OLD and NEW qualifiers can be used in which type of trigger? |
| A. | Row level DML trigger |
| B. | Row level system trigger |
| C. | Statement level DML trigger |
| D. | Row level application trigger |
| Answer» A. Row level DML trigger | |
| 1313. |
Trigger are not supported in |
| A. | Delete |
| B. | Update |
| C. | Views |
| D. | All of the mentioned |
| Answer» C. Views | |
| 1314. |
The CREATE TRIGGER statement is used to create the trigger. THE _____ clause specifies the table name on which the trigger is to be attached. The ______ specifies that this is an AFTERINSERT trigger. |
| A. | for insert, on |
| B. | On, for insert |
| C. | For, insert |
| D. | Both a and c |
| Answer» B. On, for insert | |
| 1315. |
What are the after triggers ? |
| A. | Triggers generated after a particular operation |
| B. | These triggers run after an insert, update or delete on a table |
| C. | These triggers run after an insert, views, update or delete on a table |
| D. | Both b and c |
| Answer» B. These triggers run after an insert, update or delete on a table | |
| 1316. |
The variables in the triggers are declared using |
| A. | - |
| B. | @ |
| C. | / |
| D. | /@ |
| Answer» B. @ | |
| 1317. |
Which of the following is NOT an Oracle-supported trigger? |
| A. | BEFORE |
| B. | DURING |
| C. | AFTER |
| D. | INSTEAD OF |
| Answer» B. DURING | |
| 1318. |
Which of the following is true concerning triggers? |
| A. | We do not create them with SQL. |
| B. | They execute against only some applications that access a database. |
| C. | They have an event, condition, and action. |
| D. | They cannot cascade (cause another trigger to fire). |
| Answer» C. They have an event, condition, and action. | |
| 1319. |
Which prefixes are available to Oracle triggers? |
| A. | : new only |
| B. | : old only |
| C. | Both :new and : old |
| D. | Neither :new nor : old |
| Answer» C. Both :new and : old | |
| 1320. |
Which type of entity represents a logical generalization whose actual occurrence is represented by a second, associated entity? |
| A. | Supertype entity |
| B. | Subtype entity |
| C. | Archetype entity |
| D. | Instance entity |
| Answer» C. Archetype entity | |
| 1321. |
Which of the following is the preferred way to recover a database after a transaction in progress terminates abnormally? |
| A. | Rollback |
| B. | Rollforward |
| C. | Switch to duplicate database |
| D. | Reprocess transactions |
| Answer» A. Rollback | |
| 1322. |
Concurrency control is important for which of the following reasons? |
| A. | To ensure data integrity when updates occur to the database in a multiuser environment |
| B. | To ensure data integrity when updates occur to the database in a single-user environment |
| C. | To ensure data integrity while reading data occurs to the database in a multiuser environment |
| D. | To ensure data integrity while reading data occurs to the database in a singleuser environment |
| Answer» A. To ensure data integrity when updates occur to the database in a multiuser environment | |
| 1323. |
The transaction log includes which of the following? |
| A. | The before-image of a record |
| B. | The after-image of a record |
| C. | The before and after-image of a record |
| D. | The essential data of the record |
| Answer» D. The essential data of the record | |
| 1324. |
Which of the following is not true of SQL views? |
| A. | Oracle views cannot use the ORDER BY clause in view definitions. |
| B. | Oracle views are created using the standard SQL-92 CREATE VIEW command. |
| C. | Oracle views can by queri |
| Answer» A. Oracle views cannot use the ORDER BY clause in view definitions. | |
| 1325. |
What is the type of Oracle backup in which all uncommitted changes have been removed from the datafiles? |
| A. | Full backup |
| B. | Consistent backup |
| C. | Inconsistent backup |
| D. | Differential backup |
| Answer» B. Consistent backup | |
| 1326. |
Which of the following is true concerning a procedure? |
| A. | You do not create them with SQL. |
| B. | They do not need to have a unique name. |
| C. | They include procedural and SQL statements. |
| D. | They are the same thing as a function. |
| Answer» C. They include procedural and SQL statements. | |
| 1327. |
A CASE SQL statement is which of the following? |
| A. | A way to establish an IF-THEN-ELSE in SQL. |
| B. | A way to establish a loop in SQL. |
| C. | A way to establish a data definition in SQL. |
| D. | All of the above. |
| Answer» A. A way to establish an IF-THEN-ELSE in SQL. | |
| 1328. |
Which of the following statements is true concerning routines and triggers? |
| A. | Both consist of procedural code. |
| B. | Both have to be called to operate. |
| C. | Both run automatically. |
| D. | Both are stored in the database. |
| Answer» A. Both consist of procedural code. | |
| 1329. |
How many bytes does each character in the UTF8 encoding take up? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | All mentioned above |
| Answer» D. All mentioned above | |
| 1330. |
PL/SQL has two types of subprograms, procedures and functions. Which subprogram isused to compute a value? |
| A. | Procedure |
| B. | Function |
| C. | Both A & B |
| D. | None of the above |
| Answer» B. Function | |
| 1331. |
Which datatype is not allowed in the definition of PL/SQL record? |
| A. | A Collection |
| B. | A Scalar |
| C. | Both A & B |
| D. | None of the above |
| Answer» A. A Collection | |
| 1332. |
In the SQL Cursor, which attribute is TRUE when a cursor has some remaining rows to fetch, and FALSE when a cursor has no rows left to fetch? |
| A. | %ROWCOUNT |
| B. | %FOUND |
| C. | %NOTFOUND |
| D. | %ISOPEN |
| Answer» B. %FOUND | |
| 1333. |
For which Exception, if a SELECT statement attempts to retrieve data based on its conditions, this exception is raised when no rows satisfy the SELECT criteria? |
| A. | TOO_MANY_ROWS |
| B. | NO_DATA_FOUND |
| C. | VALUE_ERROR |
| D. | DUP_VAL_ON_INDEX |
| Answer» D. DUP_VAL_ON_INDEX | |
| 1334. |
In the PL/SQL block below, how many rows will be inserted in the messages table? DECLARE v_start_salesNUMBER := 2; v_end_sales NUMBER := 100; BEGIN FOR i IN v_start_sales..v_end_sales LOOP INSERT INTO messages(msgid) VALUES v_start_sales; END LOOP; END; |
| A. | 0 |
| B. | 99 |
| C. | 1 |
| D. | 100 |
| Answer» B. 99 | |
| 1335. |
Which collection types is also known as index-by tables, lets you look up elements Using arbitrary numbers and strings for subscript values? |
| A. | Associative arrays |
| B. | Nested tables |
| C. | Varrays |
| D. | None of the above |
| Answer» A. Associative arrays | |
| 1336. |
Assigning a value to a collection element can cause exceptions, such as |
| A. | If the subscript is NULL or is not convertible to the right datatype, PL/SQL raises the predefined exception VALUE_ERROR. Usually, the subscript must be an integer. Associative arrays can also be declared to have VARCHAR2 subscripts. |
| B. | If the subscript refers to an uninitialized element, PL/SQL raises SUBSCRIPT_BEYOND_COUNT. |
| C. | If the collection is atomically null, PL/SQL raises COLLECTION_IS_NULL. |
| D. | All mentioned above |
| Answer» D. All mentioned above | |
| 1337. |
Which is a procedural extension of Oracle- SQL that offers language constructs similar tothose in imperative programming languages? |
| A. | PQL |
| B. | Advanced SQL |
| C. | PL/SQL |
| D. | SQL |
| Answer» C. PL/SQL | |
| 1338. |
Which of the following retains duplicate rows in the result of a query or in an Aggregate expression? |
| A. | ALL |
| B. | DISTINCT |
| C. | PRIOR |
| D. | None of the above |
| Answer» A. ALL | |
| 1339. |
Which of the following is an aggregate function in SQL? |
| A. | Union |
| B. | Like |
| C. | Group By |
| D. | Max |
| Answer» D. Max | |
| 1340. |
Which command is used to add a column to an existing table? |
| A. | Create |
| B. | Update |
| C. | Alter |
| D. | None of these |
| Answer» C. Alter | |
| 1341. |
A deadlock exists in the system if and only if the wait for graph: |
| A. | has a cycle in it |
| B. | has a path from first node to last node |
| C. | is a tree |
| D. | none of the above |
| Answer» A. has a cycle in it | |
| 1342. |
Rollback of transactions is normally used to: |
| A. | recover from transaction failure |
| B. | update the transaction |
| C. | retrieve old records |
| D. | repeat a transaction |
| Answer» A. recover from transaction failure | |
| 1343. |
The DBMS language component which can be embedded in a program is |
| A. | The data definition language (DDL). |
| B. | The data manipulation language (DML). |
| C. | The database administrator (DBA). |
| D. | A query language |
| Answer» B. The data manipulation language (DML). | |
| 1344. |
The statement in SQL which allows to change the definition of a table is |
| A. | Alter. |
| B. | Update. |
| C. | Create. |
| D. | select. |
| Answer» A. Alter. | |
| 1345. |
A DBMS query language is designed to |
| A. | support end users who use English-like commands. |
| B. | support in the development of complex applications software. |
| C. | specify the structure of a database. |
| D. | all of the above. |
| Answer» D. all of the above. | |
| 1346. |
Which of the following is correct |
| A. | a SQL query automatically eliminates duplicates. |
| B. | SQL permits attribute names to be repeated in the same relation. |
| C. | a SQL query will not work if there are no indexes on the relations |
| D. | None of these |
| Answer» D. None of these | |
| 1347. |
Which of the following is a valid SQL type? |
| A. | CHARACTER |
| B. | NUMERIC |
| C. | FLOAT |
| D. | All of the above |
| Answer» D. All of the above | |
| 1348. |
Which of the following is a legal expression in SQL? |
| A. | SELECT NULL FROM EMPLOYEE; |
| B. | SELECT NAME FROM EMPLOYEE; |
| C. | SELECT NAME FROM EMPLOYEE WHERE SALARY = NULL; |
| D. | none of the above |
| Answer» B. SELECT NAME FROM EMPLOYEE; | |
| 1349. |
If every non-key attribute is functionally dependent on the primary key, then the relation will be in: |
| A. | First normal form |
| B. | Second normal form |
| C. | Third normal form |
| D. | Fourth normal form |
| Answer» C. Third normal form | |
| 1350. |
Given the functional dependencies X →W; X→Y; Y→Z and Z→PQ Which of the following doesn’t hold well? |
| A. | X→Z |
| B. | W→Z |
| C. | X→WY |
| D. | None of the above |
| Answer» B. W→Z | |
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