The Netezza COPY command moves data between IBM Netezza tables and standard file system files, sometimes to standard output. Netezza COPY Command Use the COPY command with a file name to read directly from or write to a file. The nzload command is much faster and stable compared to COPY command. Netezza always recommends using nzload instead of COPY command. Netezza does not recommend using the COPY command. For load/unload operations use the nzload command or CREATE EXTERNAL TABLE commands. These commands are faster and more stable than the COPY…

A transaction is a series of one or more operations on database-related objects and/or data. The transaction management is process of ensuring the transaction is successfully completed and commited in the Netezza database. In this article, we will discuss about the Netezza transaction management using BEGIN, COMMIT and ROLLBACK.  Read: Netezza CREATE TABLE command and Examples  Database ACID Properties and Explanation Clustered base table in Netezza  IBM Netezza Alter Table Command and Examples  Netezza Create User Command and Examples You can execute the DDL statements in transactions. Statements executed outside of…

Once you created a user, you can change the parameters of the user at any time with Netezza ALTER USER command. You can read my other post Netezza CREATE USER command and examples. Netezza Alter User Command Syntax In the Netezza, username, database name and group name are unique. You cannot have same user as the group name. Read: IBM Netezza Alter Table Command and Examples How to Resolve Netezza too many Concurrent Sessions issue? Netezza Create User Command and Examples Syntax for altering a user: ALTER USER username [WITH [PASSWORD…

Use the Netezza CREATE USER command to define a new database user account. You can specify the parameters like password, expire date, default priority etc to the user while creating an account. Netezza Create User Command Syntax In the Netezza, username, database name and group name are unique. You cannot have same user as the group name. Syntax for creating a user: CREATE USER username [WITH [PASSWORD {'string' | NULL }] [SYSID uid] [ROWSETLIMIT [integer ] [IN GROUP groupname [, ...] ] [VALID UNTIL 'date' ] [SESSIONTIMEOUT [integer ] [QUERYTIMEOUT…

The Netezza regular expression functions identify precise patterns of characters and are useful for extracting string from the data and validation of the existing data, for example, validate date, range checks, checks for characters, and extract specific characters from the data. All these Netezza regular expressions are added in the Netezza SQL extension toolkit. Read: Download and install Netezza SQL toolkit extension IBM Netezza Update Join Syntax and Examples Netezza Extract Functions and Examples Netezza Extract Numbers using Regular Expressions In this article, we will check out some of the…

IBM has introduced some of new functions in its latest version of Netezza. The new features include bunch of useful regular expression. All these new functions are available as a part of Netezza SQL toolkit extension. In this article, we will discuss about Netezza extract numbers using regular expressions. Read: Download and install Netezza SQL toolkit extension Netezza Pivot Rows to Column With Example Netezza Extract Functions and Examples IBM Netezza Regular Expression Functions and Examples Netezza Extract Numbers using Regular Expressions Below are the some of the examples for Netezza…

Netezza Implicit Skew is the Netezza skew that occurs within the database when processing large data sets. The implicit Netezza skew are very difficult to identify. You can read more on Netezza Skew and How to avoid it. Netezza Implicit Skew Netezza implicit skew is occurs when data get redistributed or broadcasted on some other column to perform join operations. Data will be redistributed or broadcasted to perform co-located joins. The column on which data get redistributed or joined could be skewed that is, most of the redistributed data get inserted to…

Let us assume you are migration data from one Netezza server to other or new higher version Netezza server. Once the migration is completed, you have to perform some mandatory checks such as availability of objects, compare count of all table between two servers. In this article, we will discuss on Netezza Count Records from all Tables in Database and some Example. Check: IBM Netezza Count All Database Objects – System Table Query Netezza Pivot  Rows to Column with Example IBM Netezza Split Delimited Fields into Table Records and Examples…

You can insert new records and update existing by using nzload command itself. In this article, we will discuss about the new feature introduced in nzload. Netezza version 7.2.x supports the Netezza nzload merge operations. Netezza nzload merge operations The Netezza nzload command now supports merge operations to enable this new feature you must use three new options in nzload: -merge option—Specifies whether to merge the contents of the data file into the target table by inserting rows, updating rows, or both INSERT - Inserts new rows into the table. UPDATE…

Like any other database such as Oracle, Netezza also allows you to load data using control files. In this article, we will discuss about the Netezza nzload control files and its syntax with examples. Using a nzload control file, you can define load operations in a text file instead of having to specify options on the command line. You can specify the information such as data file name, log file details etc in control file. You can also use control files to run multiple concurrent table loads, with different options…