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NEW QUESTION: 1
Which two statements are true regarding B-tree index? (Choose two.)
A. The leaf blocks in the index are doubly linked.
B. The rows with NULL value in key columns also have entries in the index.
C. The leaf node stores a bitmap for each key value.
D. The deletion of a row from the table causes a logical deletion in index leaf block and the space becomes available for the new leaf entry.
Answer: A,D
Explanation:
B-Tree Index
Structure of a B-tree Index
At the top of the index is the root, which contains entries that point to the next level in the index. At the next level are branch blocks, which in turn point to blocks at the next level in the index. At the lowest level are the leaf nodes, which contain the index entries that point to rows in the table. The leaf blocks are doubly linked to facilitate the scanning of the index in an ascending as well as descending order of key values.
Format of Index Leaf Entries
An index entry has the following components:
* Entry header: Stores the number of columns and locking information
* Key column length-value pairs: Define the size of a column in the key followed by the value for the column (The number of such pairs is the maximum of the number of columns in the index.)
* ROWID: Row ID of a row that contains the key values
B-Tree Index (continued)
Index Leaf Entry Characteristics
In a B-tree index on a nonpartitioned table:
* Key values are repeated if there are multiple rows that have the same key value unless the index is compressed
* There is no index entry corresponding to a row that has all key columns that are NULL.
Therefore, a WHERE clause specifying NULL always results in a full table scan.
* A restricted ROWID is used to point to the rows of the table because all rows belong to the same segment Effect of DML Operations on an Index The Oracle server maintains all the indexes when DML operations are carried out on a table. Here is an explanation of the effect of a DML command on an index:
* Insert operations result in the insertion of an index entry in the appropriate block.
* Deleting a row results only in a logical deletion of the index entry. The space used by the deleted row is available for new sequential leaf entries.
* Updates to the key columns result in a logical delete and an insert to the index. The PCTFREE setting has no effect on the index except at the time of creation. A new entry may be added to an index block even if it has less space than that specified by PCTFREE.
Types of Indexes
These are several types of index structures that are available depending on your needs.
Two of the most common are:
* B-tree index
- Default index type; in the form of a balanced tree
* Bitmap index:
- Has a bitmap for each distinct value indexed
- Each bit position represents a row that may or may not contain the indexed value.
- Best for low-cardinality columns
NEW QUESTION: 2
Whenever a user's machine is turned on, a black screen appears prompting the user for an administrative password. The technician has no such password on file for this machine.
Which of the following steps should the technician take to resolve this issue?
A. Remove the motherboard and place it back into the machine after ten minutes.
B. Press and hold the CPU power button for five seconds, and then power back on.
C. Disconnect and reconnect the internal hard drive.
D. Remove the CMOS battery and reinsert it after ten seconds.
Answer: D
NEW QUESTION: 3
A user receives the following email message:
---
From: IT Department To: Joe User Subject: Email quota exceeded.
Your mailbox has reached the maximum size. Your account will be suspended unless you provide the IT department the following required information:
--
Username:
Password:
This an example of which of the following?
A. Malware
B. Phishing
C. Worm
D. Spyware
Answer: B
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