Tags » Netezza

Zone Maps: Netezza's Answer to Indexes in Big Data

There are no indexes in Netezza. This is an intentional design choice. Indexes are effective in an OLTP system, where transactions affect a single row or two, but not in an OLAP system, where transactions affect large sets of data. 1,660 more words

Netezza

Hidden Columns in Netezza

Want to view deleted data? See which rows were added in a transaction? These extra fields will allow you to do so. 184 more words

Netezza

Netezza Distributions: Divide and Conquer Big Data

Inside Netezza are specialized processing units called SPUs, which have their own sets of disks, each containing a portion of your data. The SPUs work in parallel to return the answer you need. 1,331 more words

Netezza

An Intro to Netezza

In any database, whether it’s SQL Server, Oracle, Sybase, DB2, Access (does Access count?), or anything else, the primary bottleneck is disk IO. Even if you have an SSD, the disk is the slowest part. 739 more words

Netezza

Netezza: 'abstime' datatype conversion

Error generated:

/* ERROR ERROR:  Type ‘abstime’ not supported by IBM Netezza SQL or has invalid size */

CREATE TABLE NZ_V_TABLE_ONLY_STORAGE_STAT AS SELECT CREATEDATE  FROM _V_TABLE_xdb; 97 more words

Netezza: get database names into a Bash shell variable

Set a variable DATABASES to loop through later in a for loop:

DATABASES=`nz_get_database_names`

then loop like this

for DATABASE in $DATABASES; do 
    export NZ_DATABASE=\"$DATABASE\"
    # Get the INITIAL list of table names (or schemaname.tablenames)
    if [ "$MultiSchema" = "" ]; then 
           export period_delimiter=$DELIMITER ; 
           unset NZ_SCHEMA ; 
    fi
    TABLES=`nz_get_table_names`
    unset period_delimiter
... 41 more words

Netezza: change number of plan history files

Change default 2000 number of plan history files to 10,000.

Put line the following line into

/nz/data/config/system.cfg
host.planHistFiles=10000

Refer to IBM documentation:  Plan file archives and host resources