Netezza

Groom in Netezza Tables and Databases with Aginity

Before getting into how to groom Netezza table and database, first let’s understand what grooming is? Use the GROOM TABLE command to maintain the user tables by reclaiming disk space for deleted or outdated rows. You can also use GROOM TABLE command to reorganize the tables by their organizing keys columns. End user can execute DML statements such as SELECT, UPDATE, DELETE, and INSERT operations while the data grooming is running. The SELECT operations run in parallel with the grooming operations and any INSERT, UPDATE, and DELETE operations run serially between the…

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July 13, 2016
Netezza

Easy methods to Import data using Aginity

In this post, I am going to show you how to import data using Aginity workbench. Data import in Aginity workbench has fairly easy method to get data into Netezza system for those who are not familiar with nzload and external table options. Netezza import is one of important task in Neteza data warehouse. Read:  Installing Aginity workbench Aginity workbench is an easy-to-use application that enhances performance and creates efficiencies when working with MPP data warehouse appliances. Aginity workbench provides a powerful set of GUI-based tools for developers, DBAs, and data analysts. Import…

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July 9, 2016
Netezza

How to Install Aginity Workbench for Netezza

I have received multiple requests to create tutorial on working with Netezza SQL database development tool. In this post, I have created guide to install Netezza Aginity workbench in windows environment. About Netezza Aginity Aginity workbench is an easy-to-use application that enhances performance and creates efficiencies when working with MPP data warehouse appliances. Aginity workbench provides a powerful set of GUI-based tools for developers, DBAs, and data analysts. Read: Access Netezza Database, Tools and Examples Netezza Groom Tables and Databases nzsql command and its Usage Netezza SET CATALOG command This SQL database…

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July 8, 2016
Netezza

Netezza Sequence and how to Create/Use it

A Netezza sequence is named objects in an individual database in Netezza, that can provide the unique value when get next value method. You can use sequence to generate unique numbers that can be used as surrogate key values for primary key values. Netezza Sequence Overview A sequence value is an integer that you can use wherever you would use numeric values. Netezza supports user sequences for the four integer types: byteint, smallint, integer, and bigint. You can even create a sequence with an initial value, an increment, a minimum and a maximum value.…

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July 7, 2016
Netezza

Netezza Skew and How to avoid it

You will hear a lot about "Netezza Skew" if you are developing data warehouse on Netezza, Redshift, Teradata, hive or Impala database. The performance of the system is directly linked to uniform distribution of the user data  across all of the data slices in the system. When you create a table and then load the data into the system, the rows of the table should be distributed uniformly among all the data slices. If some data slices have more rows of a table than others this scenarios is called skew.…

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July 6, 2016
Netezza

Importance of right Netezza Distribution key

This post is all about how data is distributed (Netezza distribution key) in Netezza server. Feel free to make comments or suggestions to improve it, or pass it on if you like. Let’s first understand how NPS stores the data on disk drives. Each Snippet Processor in the Snippet Processing Unit (SPU) has a dedicated hard drive has its separate CPU, FPGA, separate RAM memory, hard disks  and the data on stored on drive is called a data slice. Read: Changing Netezza Table Distribution Key Cluster Based Tables (CBT) in…

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July 6, 2016
Netezza

Working with Netezza Zone Maps and Best Practices

Before going to Netezza zone maps first let’s understand extent.  An extent is smallest unit of storage on the disk. In fact it is smallest disk allocation on storage to store the data. Netezza would maintain the maximum and minimum value of the column that is stored in an extent (each extent is of 3MB in size) What are Netezza Zone maps? Netezza Zone maps is an internal mapping structure to the extent (smallest unit of storage) that takes advantage of internal ordering of the data.  These are automatically generated internal…

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July 6, 2016
Netezza

A Guide to load data into Netezza Database

Netezza data load is transferring data into Netezza appliance. There are several ways to transfer the data into appliance. Netezza Data Load using External tables These are tables stored as flat files on the host or client systems and not in the Netezza appliance database. Create table on top of the flat file that needs to be loaded to Netezza tables, then use that external table to load target table in Netezza appliance. As a result data will be copied to the target table. Flat Files An external table allows…

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July 6, 2016
Netezza

How Netezza FPGA Works on Netezza SQL Query ?

The Netezza FPGA is a the heart of Netezza’s patented streaming architecture and is made of a result of framework of FPGA Accelerated streaming technology (FAST) engine. In this post we will see how FPGA works in Netezza SQL. In the following subsequent paragraphs we will see how FPGA works when we execute Netezza SQL query on host machine. Read: Netezza FPGA  - FAST Framework in Netezza The performance multiplying effect of the FPGA FAST engine: Control, Parse, Visibility, Project and Restrict is shown with help of small example of processing SQL query…

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July 5, 2016
Netezza

Netezza FPGA – FAST Framework in Netezza

Most of the companies around the globe using Netezza data warehouse appliance to perform their near real-time, complex analytics and data warehouse needs. Netezza FPGA is important part of NPS system. NPS performance is made of a result of framework of Netezza FPGA Accelerated streaming technology (FAST) engine. This engine is just like a turbo-charger to an already powerful engine. This FAST engine what makes the Netezza a powerful server. Read: Working with Netezza Zone Maps nzload command and its Usage nzsql Command and its Usage Netezza has introduced a FAST…

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July 5, 2016