Exam Code: C2090-558
Exam Name: Informix Fundamentals 11.70
Under which of the following conditions does the LAST COMMITTED option have an effect on the COMMITTED READ isolation level?
A. Row level lock
B. Page level locking
C. RAW or unlogged tables
D. Tables containing complex data types
You have a database server environment where all databases use buffered logging. In which two conditions are the logical-log buffers in shared memory flushed to the logical log on disk? (Choose two.)
A. When the buffer is full.
B. When a checkpoint occurs.
C. When a user issues a begin work.
D. When a user commits the transaction.
E. When a user rolls back the transaction.
What are two ways to create table t1 with row level locking? (Choose two.)
A. Execute the command “create table t1 (c1 int) locking row”.
B. Execute the command “create table t1 (c1 int) lock level row”.
C. Execute the command “create table t1 (c1 int) lock mode row”.
D. Set DEF_TABLE_LOCKMODE to ROW in ONCONFIG before executing “create table
E. Set the environment variable DEF_TABLE_LOCKMODE to ROW before executing “create table t1(c1 int)”.
Click the Exhibit button.
An administrator created a table using the SQL statement shown in the exhibit to perform a load operation every day at 11:00 AM. What is the best way to optimize a backup strategy to recover the client table in case of a failure?
A. a level-1 backup at 6:00 AM everyday
B. a level-0 backup soon after the load operation
C. a level-1 backup on Sunday and continuous log backup
D. a level-2 backup at 6:00 AM every day and continuous log backup
Which command option should be used to resume an interrupted onbar restore?
A. Client 2 will update col2 of the rows having col1=20.
B. Client 2 will return successfully without updating any rows.
C. Client 2 will keep waiting for client 1 to finish its transaction.
D. Client 2 will get an error that the “record is locked” or the “table is locked”.
Why would you want to create a table with a lock mode row as opposed to a lock mode page?
A. to reduce disk I/O
B. to keep more information in memory for each locked row
C. to increase concurrency among multiple users on the same table
D. to reduce the number of locks when accessing rows out of the table
Which isolation level is appropriate if you do not want your query to place any locks?
A. Dirty Read
B. Cursor Stability
C. Committed Read
D. Repeatable Read
Which of the following is true about system catalog tables access?
A. Only user informix can read system catalog tables
B. Only system administrators can read system catalog tables
C. Only database administrators can read system catalog tables
D. Any user that can connect to the database can read system catalog tables
How can you determine which databases are created in an instance?
A. use dbschema utility
B. inspect ONCONFIG file
C. List reserved pages with oncheck -pr
D. run SELECT name FROM sysmaster:sysdatabases
When restoring data, which granularity of object may NOT be restored?
A. a single table
B. a single chunk
C. a single dbspace
D. an entire instance
Which command would you execute to restore to a specific moment-in-time?
A. onbar -t timestamp
B. onbar -r -log lognum
C. onbar -r -t timestamp
D. onbar -r -l timestamp
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