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NEW QUESTION: 1
You want to capture column group usage and gather extended statistics for better cardinality estimates for the CUSTOMERS table in the SH schema.
Examine the following steps:
1.Issue the SELECT DBMS_STATS.CREATE_EXTENDED_STATS ('SH', 'CUSTOMERS') FROM dual statement.
2.Execute the DBMS_STATS.SEED_COL_USAGE (null, 'SH', 500) procedure.
3.Execute the required queries on the CUSTOMERS table.
4.Issue the SELECT DBMS_STATS.REPORT_COL_USAGE ('SH', 'CUSTOMERS') FROM dual statement.
Identify the correct sequence of steps.
A. 3, 2, 4, 1
B. 2, 3, 4, 1
C. 4, 1, 3, 2
D. 3, 2, 1, 4
Answer: B
Explanation:
Step1(2). Seed column usage
Oracle must observe a representative workload, in order to determine the appropriate
column groups. Using the new procedure DBMS_STATS.SEED_COL_USAGE, you tell
Oracle how long it should observe the workload.
Step 2: (3) You don't need to execute all of the queries in your work during this window.
You can simply run explain plan for some of your longer running queries to ensure column
group information is recorded for these queries.
Step 3. (1)Create the column groups
At this point you can get Oracle to automatically create the column groups for each of the
tables based on the usage information captured during the monitoring window. You simply
have to call the DBMS_STATS.CREATE_EXTENDED_STATS function for each table.This
function requires just two arguments, the schema name and the table name. From then on,
statistics will be maintained for each column group whenever statistics are gathered on the
table.
Note:
*DBMS_STATS.REPORT_COL_USAGE reports column usage information and records all
the SQL operations the database has processed for a given object.
*The Oracle SQL optimizer has always been ignorant of the implied relationships between
data columns within the same table. While the optimizer has traditionally analyzed the distribution of values within a column, he does not collect value-based relationships between columns. *Creating extended statisticsHere are the steps to create extended statistics for related table columns withdbms_stats.created_extended_stats: 1 - The first step is to create column histograms for the related columns.2 - Next, we run dbms_stats.create_extended_stats to relate the columns together.
Unlike a traditional procedure that is invoked via an execute ("exec") statement, Oracle extended statistics are created via a select statement.
NEW QUESTION: 2
A. Option C
B. Option D
C. Option A
D. Option E
E. Option B
Answer: B
NEW QUESTION: 3
Which of the following internal busses are used for expansion cards?
Each correct answer represents a complete solution. Choose all that apply.
A. PCI
B. ISA
C. PCI Express
D. SATA
Answer: A,B,C
Explanation:
The following internal busses are used for expansion cards: PCI Express PCI ISA What is PCI Express (PCIe)? PCI Express (PCIe), also known as 3rd Generation I/O (3GIO), is a type of computer bus. It is a new I/O bus technology that has more bandwidth than PCI and AGP slots. It uses two low voltage differential pairs, at 2.5Gb/s in each direction. It is designed to replace PCI and AGP expansion slots. The bus is available in several different bus widths: x1, x2, x4, x8, x12, x16, and x32. PCIe is able to transfer data in both directions at a time. PCIe hardware will work on operating
systems that support PCI.
What is a PCI bus?
Peripheral Component Interconnect (PCI) is a high-performance, 32-bit or 64-bit bus
designed to be used with devices that have high bandwidth requirements, such as the
display subsystem.
What is an ISA bus?
Industry Standard Architecture (ISA) is an 8-bit expansion bus that provides an interface
from devices on expansion cards to the computer's internal bus. A later version of ISA bus
comes with a 16-bit expansion slot.
Answer option B is incorrect. SATA is used for hard disk drive and CD/DVD drives.
What is SATA?
The Serial ATA (SATA) computer bus is a storage-interface for connecting host bus
adapters to mass storage devices such as hard disk drives and optical drives. SATA offers
several compelling advantages over the older parallel ATA (PATA) interface, such as
reduced cable-bulk and cost, faster and more efficient data transfer, full duplex, and hot
swapping. It is designed to replace the older ATA (AT Attachment) standard (Parallel ATA).
All SATA devices support hot plugging and hot swapping. SATA supports Native Command
Queuing (NCQ) for enhanced performance.
Reference: "http://en.wikipedia.org/wiki/Computer_hardware"