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Code d'Examen: C2090-556
Nom d'Examen: IBM (Informix 11.50 Application Developer)
Questions et réponses: 112 Q&As

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NO.1 A user has opened two sessions, SESSION_1 and SESSION_2, connecting to the
same database
containing a table named customer. The following query is executed first from SESSION_1
and then from
SESSION_2 (without closing SESSION_1): SELECT * FROM customer INTO TEMP
cust_temp What is
the outcome in SESSION_2?
A. A locking error.
B. SELECT query will wait till SESSION_1 has ended.
C. Error indicating Temp table (cust_temp) already exists.
D. All rows from customer table will be retrieved intocust_temp table.
Answer: D

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NO.2 What is the syntax to query a table that resides on a remote Informix database?
A. database@server:[owner.]table
B. database@server:databasename:[owner.]table
C. database@server:user:password:[owner.]table
D. database@server:databasename:user:password:[owner.]table
Answer: A

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NO.3 Which two values can be used for connection type field from sqlhosts file when using
Distributed
Relational Database Architecture (DRDA) protocol? (Choose two.)
A. ontlitcp
B. onipcshm
C. onsoctcp
D. drtlitcp
E. drsoctcp
Answer: D,E

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NO.4 When is a cursor necessary in an SQL program?
A. A cursor is necessary before an after trigger can be created.
B. A cursor is necessary when a query returns one row and you wish to examine its content
and maybe
update it or delete it.
C. A cursor is necessary when a query returns more than one row and you wish to examine
their content
before an update or delete statement is executed.
D. A cursor is only necessary when using DISTINCT, UNIQUE, ORDER BY, GROUP BY or
aggregates in
SQL statements.
Answer: C

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NO.5 Assuming you have an employee table that stores the salary for each employee. What
will this query
return? SELECT AVG(salary), STDEV(salary) FROM employees;
A. Average salary and standard deviation for all rows.
B. Average salary and standard deviation for all rows not containing NULL salaries.
C. Average salary and standard deviation for all rows assuming zero for NULL salaries.
D. Average salary and standard deviation for all rows assuming the average value for NULL
salaries.
Answer: B

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NO.6 Given the attached exhibit, what value does Mary see for their savings account?
A. 0
B. 100
C. 200
D. -100
Answer: B

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NO.7 Which Committed Read isolation level statement is correct?
A. It locks all rows examined.
B. It does not check for locks.
C. It checks for locks after returning a row.
D. It checks for locks before returning a row.
Answer: D

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NO.8 How is the DBINFO function used in the SQL statement below? SELECT FIRST 1
DBINFO('sessionid')
FROM systables;
A. The DBINFO function sets the session id.
B. The DBINFO function creates a new session.
C. The DBINFO function returns the current session id.
D. The DBINFO function is a wrapper to the systables table.
Answer: C

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NO.9 In an ANSI compliant database, what value of SQLCODE indicates a successful
query that returned no
rows?
A. 100
B. -330
C. -201
D. -1
Answer: A

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NO.10 Which temporary table statement is NOT true?
A. The table can use multipledbspaces.
B. The table can have fragmented indexes.
C. Temporary tables are visible to all users.
D. The table exists until the database is closed.
Answer: C

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NO.11 What are the two valid methods to obtain trace data for diagnosing JDBC problems
with the IBM Data
Server Driver for JDBC and SQLJ type 4 connectivity? (Choose two.)
A. Set theibm.jcc.override.trace property.
B. Set theifx.jcc.override.traceFile property.
C. Set the db2.jcc.override.traceFile property.
D. Set theifx.jcc.override.traceDirectory property.
E. Set the db2.jcc.override.traceDirectory property.
Answer: C,E

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NO.12 Which URL syntax is NOT used for DRDA communications?
A. jdbc:ids
B. jdbc:db2
C. jdbc:informix
D. jdbc:db2j:net
Answer: C

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NO.13 What are user created temporary tables used for?
A. To persistently write temporary data to disk.
B. To share result sets across multiple sessions.
C. To access a temporary result set within one session.
D. To automatically delete data based on a time policy.
Answer: C

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NO.14 What Informix onconfig parameter is used to enable specific user level SQL tracing?
A. SQLIDEBUG
B. SQLTRACE
C. SQL_XTRACE
D. TRACE_SQL
Answer: B

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NO.15 Which type of isolation level results in a lock on every row a query examines in order
to retrieve any row
from the result set?
A. DIRTY READ
B. COMMITTED READ
C. CURSOR STABILITY
D. REPEATABLE READ
Answer: D

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NO.16 How can you prevent concurrency problems when other users are modifying a
nonlogging or raw
table?
A. Lock the table in exclusive mode for the whole transaction OR use repeatable read
isolation level for
the whole transaction.
B. Lock the table in exclusive mode for the whole transaction OR use committed read
isolation level for
the whole transaction.
C. Lock the table in shared mode for the whole transaction OR use repeatable read isolation
level for the
whole transaction.
D. Lock the table in shared mode for the whole transaction OR use committed read isolation
level for the
whole transaction.
Answer: A

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NO.17 You wish to show a user a total balance across all of their savings and checking
accounts. However,
you do not want them to be blocked or to see inconsistent information if money is being
transferred
between their accounts at the time of the query. What isolation level would you use?
A. READ COMMITTED
B. REPEATABLE READ
C. COMMITTED READ LAST COMMITTED
D. CURSOR STABILITY LAST COMMITTED
Answer: C

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NO.18 When using IBM Data Server Driver for JDBC to connect to Informix Server, which
URL should be
used when making a connection using Distributed Relational Database Architecture
protocol?
A. "jdbc:ids://hostname1:5021/storesdb:user=XXX;password=YYY"
B. "jdbc:drda://hostname1:5021/storesdb:user=XXX;password=YYY" C.
"jdbc:db2j:net://hostname1:5021/storesdb:user=XXX;password=YYY"
D."jdbc:informixsqli://hostname1:5021/storesdb:INFORMIXSERVER=myserver;user=XXX;pa
ssword=YY
Y"
Answer: A

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NO.19 What is the SQL statement cache used for?
A. To cache static SQL statements.
B. To cache dynamic SQL statements across sessions.
C. To cache all SQL statements for tracing purposes.
D. To provide a history of SQL statements to the application.
Answer: B

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NO.20 Which statement describes a select cursor?
A. It is used when you associate an EXECUTE FUNCTION statement with a cursor.
B. It is a cursor that uses the FETCH option to retrieve successive rows of data from another
cursor.
C. It is the representation of columns or values that a user-defined function returns after a
SELECT
statement.
D. It is a data structure that represents the active set of rows that the SELECT statement
retrieved.
Answer: D

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