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NEW QUESTION: 1
Which three operations can be performed as multipartition operations in Oracle?
A. Drop partitions of a list partitioned table
B. Rename partitions of a range partitioned table
C. Merge partitions of a reference partitioned index
D. Coalesce partitions of a hash-partitioned global index.
E. Merge partitions of a list partitioned table
F. Move partitions of a range-partitioned table
Answer: A,C,E
Explanation:
Explanation/Reference:
Explanation:
Multipartition maintenance enables adding, dropping, truncate, merge, split operations on multiple partitions.
A: Merge Multiple Partitions:
The new "ALTER TABLE ... MERGE PARTITIONS " help merge multiple partitions or subpartitions with a single statement. When merging multiple partitions, local and global index operations and semantics for inheritance of unspecified physical attributes are the same for merging two partitions.
B: Drop Multiple Partitions:
The new "ALTER TABLE ... DROP PARTITIONS " help drop multiple partitions or subpartitions with a single statement.
Example:
view plaincopy to clipboardprint?
SQL> ALTER TABLE Tab_tst1 DROP PARTITIONS
Tab_tst1_PART5, Tab_tst1_PART6, Tab_tst1_PART7;
Table altered
SQL>
Restrictions :
- You can't drop all partitions of the table.
- If the table has a single partition, you will get the error: ORA-14083: cannot drop the only partition of a partitioned.
NEW QUESTION: 2
Examine Exhibit 1 to view the query and its execution plan.
Examine Exhibit 2 to view the structure and indexes for the EMPLOYEES and DEPARTMENTS tables.
Examine Exhibit 3 to view the initialization parameters for the instance.
Why is sort-merge join chosen as the access method?
A. Because the OPTIMIZER_MODE parameter is set to ALL_ROWS.
B. Because the data is not sorted in the LAST_NAME column of the EMPLOYEES table
C. Because of the LIKE operator used in the query to filter out records
D. Because of an inequality condition.
Answer: A
Explanation:
Incorrect:
B: There is not aninequality conditionin the statement.
C: Merge joins are beneficial if the columns are sorted.
D:All regular joins should be able to use Hash or Sort Merge, except LIKE, !=, and NOT ...
joins.
Note: *A sort merge join is a join optimization method where two tables are sorted and then joined. *A "sort merge" join is performed by sorting the two data sets to be joined according to the join keys and then merging them together. The merge is very cheap, but the sort can be prohibitively expensive especially if the sort spills to disk. The cost of the sort can be lowered if one of the data sets can be accessed in sorted order via an index, although accessing a high proportion of blocks of a table via an index scan can also be very expensive in comparison to a full table scan.
*Sort merge joins are useful when the join condition between two tables is an inequality condition (but not a nonequality) like <, <=, >, or >=. Sort merge joins perform better than nested loop joins for large data sets. You cannot use hash joins unless there is an equality
condition.
*When the Optimizer Uses Sort Merge Joins
The optimizer can choose a sort merge join over a hash join for joining large amounts of
data if any of the following conditions are true:
/The join condition between two tables is not an equi-join.
/Because of sorts already required by other operations, the optimizer finds it is cheaper to
use a sort merge than a hash join.
Reference: OracleDatabase Performance Tuning Guide,Sort Merge Joins
NEW QUESTION: 3
A. Option A
B. Option D
C. Option C
D. Option B
Answer: A
NEW QUESTION: 4
Given:
public class Main {
public static void main(String[] args) {
try {
doSomething();
}
catch (SpecialException e) {
System.out.println(e);
}}
static void doSomething() {
int [] ages = new int[4];
ages[4] = 17;
doSomethingElse();
}
static void doSomethingElse() {
throw new SpecialException("Thrown at end of doSomething() method"); }
}
What is the output?
A. SpecialException: Thrown at end of doSomething() method at
Main.doSomethingElse(Main.java:16)
at Main.doSomething(Main.java:13)
at Main.main(Main.java:4)
B. Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
at Main.doSomething(Main.java:12)
at Main.main(Main.java:4)
C. SpecialException: Thrown at end of doSomething() method
D. Error in thread "main" java.lang.
ArrayIndexOutOfBoundseror
Answer: B
Explanation:
The following line causes a runtime exception (as the index is out of bounds):
ages[4] = 17;
A runtime exception is thrown as anArrayIndexOutOfBoundsException.
Note: The third kind of exception (compared to checked exceptions and errors) is the runtime
exception. These are exceptional conditions that are internal to the application, and that the
application usually cannot anticipate or recover from. These usually indicate programming bugs,
such as logic errors or improper use of an API.
Runtime exceptionsare not subjectto the Catch or Specify Requirement. Runtime exceptions are
those indicated byRuntimeExceptionand its subclasses.