Administration: Omnidex Fundamentals

Omnidex Environments

Creating Environment Files

There are two methods to create Omnidex Environment Files. They can be created interactively using the Omnidex Administrator, or they can be created using SQL statements such as CREATE ENVIRONMENT, CREATE DATABASE, CREATE TABLE and CREATE INDEX. Once created, a simple Omnidex Environment File will look like this:

> create environment
>>  in                   "simple.xml"
>>  with                 delete;
Environment created in simple.xml
>
>
> create database       "SIMPLE"
>>  type                 FILE
>>  index_directory      "idx"
>>  in                   "simple.xml";
Database SIMPLE created in simple.xml
>
> create table          "HOUSEHOLDS"
>>  physical             "dat/households.dat"
>>  (
>>   "HOUSEHOLD"         CHARACTER(12),
>>   "ADDRESS"           CHARACTER(50),
>>   "CITY"              CHARACTER(28),
>>   "STATE"             CHARACTER(2),
>>   "ZIP"               CHARACTER(5),
>>   "COUNTRY"           CHARACTER(2),
>>   constraint HSHD_HOUSEHOLD_PK primary ("HOUSEHOLD")
>>  )
>>  in                   "simple.xml";
Table HOUSEHOLDS created in simple.xml
>
>
> create table          "INDIVIDUALS"
>>  physical             "dat/individuals.dat"
>>  (
>>   "INDIVIDUAL"        CHARACTER(12),
>>   "HOUSEHOLD"         CHARACTER(12),
>>   "NAME"              CHARACTER(50),
>>   "GENDER"            CHARACTER(1),
>>   "BIRTHDATE"         ANSI DATE,
>>   "PHONE"             CHARACTER(14),
>>   "EMAIL"             CHARACTER(60),
>>   constraint IND_INDIVIDUAL_PK primary ("INDIVIDUAL"),
>>   constraint IND_HOUSEHOLD_FK foreign ("HOUSEHOLD") references "HOUSEHOLDS"
>>  )
>>  in                   "simple.xml";
Table INDIVIDUALS created in simple.xml
>

Adding Omnidex Indexing

The easiest way to add Omnidex Indexing is to add indexing information beside each column. This will not work in all situations, such as when multi-column indexes are being created; however, it will work in many simpler installations. More complex installations will require the more complex features described in CREATE TABLE and CREATE INDEX. The example below shows the basic addition of Omnidex indexing to the same database.

> create environment
>>  in                   "simple.xml"
>>  with                 delete;
Environment created in simple.xml
>
>
> create database       "SIMPLE"
>>   type                FILE
>>   index_directory     "idx"
>>  in                   "simple.xml";
Database SIMPLE created in simple.xml
>
>
> create table          "HOUSEHOLDS"
>>  physical             "dat/households.dat"
>>  (
>>   "HOUSEHOLD"         CHARACTER(12)     omnidex,
>>   "ADDRESS"           CHARACTER(50)     quicktext,
>>   "CITY"              CHARACTER(28)     quicktext,
>>   "STATE"             CHARACTER(2)      omnidex,
>>   "ZIP"               CHARACTER(5)      omnidex,
>>   "COUNTRY"           CHARACTER(2)      omnidex,
>>   constraint HOUSEHOLDS_HOUSEHOLD_PK primary ("HOUSEHOLD")
>>  )
>>  in                   "simple.xml";
Table HOUSEHOLDS created in simple.xml
>
>
> create table          "INDIVIDUALS"
>>  physical             "dat/individuals.dat"
>>  (
>>   "INDIVIDUAL"        CHARACTER(12)     omnidex,
>>   "HOUSEHOLD"         CHARACTER(12)     omnidex,
>>   "NAME"              CHARACTER(50)     quicktext,
>>   "GENDER"            CHARACTER(1)      omnidex bitmap,
>>   "BIRTHDATE"         ANSI DATE         omnidex,
>>   "PHONE"             CHARACTER(14)     omnidex,
>>   "EMAIL"             CHARACTER(60)     quicktext,
>>   constraint INDIVIDUALS_INDIVIDUAL_PK primary ("INDIVIDUAL"),
>>   constraint INDIVIDUALS_HOUSEHOLD_FK foreign ("HOUSEHOLD") references "HOUSEHOLDS"
>>  )
>>  in                   "simple.xml";
Table INDIVIDUALS created in simple.xml

Updating Omnidex Indexes

When Omnidex indexing is added to an Omnidex Environment, only the metadata about each index is added to the environment. The indexes themselves are not built until an UPDATE INDEXES statement is issued. This is of great benefit since it allows multiple indexes to be built with one scan of the data. Omnidex applications frequently involve many Omnidex indexes, and building them individually would be prohibitively slow. The example below connects to the newly create environment and updates the indexes.

> connect simple
Connected to D:\class\lab1\simple.xml
>
> update indexes
Database
 Table                                       Rows        CPU    Elapsed
----------------------------------------------------------------------------
SIMPLE
 HOUSEHOLDS                                 1,909       0:00       0:00
 INDIVIDUALS                                5,000       0:00       0:00
----------------------------------------------------------------------------
Total                                                   0:00       0:03

Omnidex indexes updated
>

Additional Resources

See also:

 
Back to top
admin/basics/environments/create.txt ยท Last modified: 2016/06/28 22:38 (external edit)
 
 
chimeric.de = chi`s home Valid CSS Driven by DokuWiki do yourself a favour and use a real browser - get firefox!! Recent changes RSS feed Valid XHTML 1.0