We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

# A Biref Introduction to Pi and Si Essay Sample

The whole doc is available only for registered users OPEN DOC

Get Access

## A Biref Introduction to Pi and Si Essay Sample

Primary index is the most important feather of Teradata, causing the Primary Index decides the distribution of rows in a table on AMPs. There are two types of Primary Index in the Teradata Database, unique Primary Index and Non-unique Primary Index. Unique Primary Index results in even row distribution and eliminates the duplicate rows. While Non-Unique Primary Index results in potentially skewed distribution. Non-Unique Index worse, makes heavily-skewed distribution ignored the Teradata Parallel mechanism. So how the PI decides the distribution of a row of a table on an AMP? The Primary Index value comes into the Hashing Algorithm, and via Hashing Algorithm, the so called 32bit row hash is produced. The first 16 bit is called Row Hash, used to identify the hash map’s entry.

The hash map is an array which associates the DSW with a specific AMP. Secondary Index is another alternative way to access the row stored on the AMP. It is a sub-table in all the AMPs. Like Primary Index, there are two kinds of secondary index, Unique Secondary Index and Non-Unique Index. Unlike the Primary Index, Secondary Index does not have a effect on the distribution on AMPs. Let us take the accessing data using secondary index for instance. Unique Secondary Index is efficient. This kind of accessing typically allows of only two AMPs. So using Unique Secondary Index to access a row, two AMPs are involved. Non-Unique secondary index (NUSI) may have multiple rows per value. A NUSI is efficient when you want to prevent a full table scan.

We can write a custom essay

Order an essay

## You May Also Find These Documents Helpful

Developmental Patterns of Cognitive Function

Unit 1 Assessment You should use this file to complete your Assessment. The first thing you need to do is save a copy of this document, either onto your computer or a USB drive Then work through your Assessment, remembering to save your work regularly When youve finished, print out a copy to keep for reference Then, go to HYPERLINK http//www. vision2learn. com www. vision2learn....

Standard Normal Density

The area between two given points under the Standard Normal Density function cannot be computed by integration; what alternative method do you propose compute the area between two points under the Standard Normal Distribution. Answer: The alternative method is to use method called error function. The method used here is based on the incomplete gamma function P(a,w) given as Define an expected value of a variable...

Exponential Function

An example of an exponential function is the voltage as a function of time Vf(t) as the capacitor C1 discharges from an initial voltage Vi to a resistive load R1. The circuit of this is shown below Figure 1. Discharge of Capacitor Where Vf is the final voltage Vi is the initial voltage across the C1   Time Calculated Value Oscilloscope Reading 0.05 7.278 7.300...

Composition and Inverse

This week we have been assigned three functions which we must evaluate. These are the functions which we have to evaluate this week. fx=2x+3 gx=x2-3 hx=7-x3 We have been asked to compute(f-h)(4). So we can evaluate each separately and then subtract. f-h4=f4-h(4) f4=24+3 =8+3=11f4=11 h4=7-43 =33=1 h4=1 This is our final answer. f-h4=11-1=10 Next we are to compare two pairs of the functions into each...

Neural Tissue

Describe the anatomical and functional divisions of the nervous system. 12-2 Sketch and label the structure of a typical neuron, describe the functions of each component, and classify neurons on the basis of their structure and function. 12-3 Describe the locations and functions of the various types of neuroglia. 12-4 Explain how the resting potential is created and maintained. 12-5 Describe the events involved in...

### Essays 57,092

300+
Materials Daily
100,000+ Subjects
2000+ Topics
Free Plagiarism
Checker
All Materials
are Cataloged Well

Sorry, but copying text is forbidden on this website. If you need this or any other sample, we can send it to you via email.

Sorry, but only registered users have full access

immediately?

Become a member

Thank You A Lot!

Emma Taylor

online

Hi there!
Would you like to get such a paper?
How about getting a customized one?

Can't find What you were Looking for?