The space calculation function is a planning tool for adding new components or recalculating existing space requirements. Each calculation provides a block or cylinder estimate according to information you provide. In general, you must provide
the maximum estimated record count
average number of DE values
average descriptor, compressed record, or normal record length
estimated padding factor
device type where the Adabas component being estimated resides
In many cases, the results are "best guess" estimates; other than a device type, no defaults are assumed. Because no values are actually changed by the Space Calculation function, unrealistic estimates cause no harm.
To use the space calculation function:
Select an Adabas database in tree-view and expand it.
Select Space Calculation in tree-view.
In detail-view, a selection box allows you to choose between the following components:
ASSO - Address Converter
ASSO - Normal/Upper Index
DATA
DDFILEA
SORT - ADAINV
SORT - ADALOD load
SORT - ADALOD update
TEMP - ADAINV
TEMP - ADALOD load/update
TEMP - ADALOD delete
WORK
This document is organized as follows:
You can calculates two Associator component values: the address converter (AC) space, or the normal (NI) and upper (UI) index space.
Address converter space is based on the device type and the estimated number of records in the related Data Storage file.
To calculate address converter space:
In the Space Calculation detail-view, select ASSO - Address Converter in the selection box.
Enter your requirements in the table and click the button to calculate.
The index values are calculated for a single descriptor, requiring you to estimate such things as the average descriptor length, the number of multiple descriptors you expect to have, the total number of unique descriptor values for that field, an Associator padding factor, and a device type if other than the default.
To calculate normal/upper index space:
In the Space Calculation detail-view, select ASSO - Normal/Upper Index in the selection box.
Enter your requirements in the table and click the button to calculate.
The DATA storage calculation is based on values you provide for estimated maximum record count, the average length of a compressed record, a Data Storage padding factor, and device type. Results are specified in both blocks and cylinders.
To calculate data storage space:
In the Space Calculation detail-view, select DATA in the selection box.
Enter your requirements in the table and click the button to calculate.
The space required for the DD/FILEA sequential dataset is calculated when it is used with the ADAORD utility. (The dataset is also used with the ADALOD utility.)
To calculate space for the DD/FILEA sequential dataset:
In the Space Calculation detail-view, select DDFILEA in the selection box.
Enter your requirements in the table and click the button to calculate.
The storage needed on SORT for the utility function chosen is calculated.
The topic is organized as follows:
To calculate the space needed on SORT for the ADAINV utility
function:
In the Space Calculation detail-view, select SORT - ADAINV in the selection box.
Enter your requirements in the table and supply the password (if required). Click the button to calculate.
For the ADALOD LOAD calculation, the default number of records is MAXISN rather than TOPISN as it is for the ADAINV function.
To calculate the space needed on SORT for the ADALOD LOAD utility
function:
In the Space Calculation detail-view, select SORT - ADALOD Load in the selection box.
Enter your requirements in the table and supply the password (if required). Click the button to calculate.
For the ADALOD UPDATE calculation, the default number of records is 0.
To calculate the space needed on SORT for the ADALOD UPDATE utility
function:
In the Space Calculation detail-view, select SORT - ADALOD Update in the selection box.
Enter your requirements in the table and supply the password (if required). Click the button to calculate.
The storage needed on TEMP for the utility function chosen is calculated.
The topic is organized as follows:
To calculate the space needed on TEMP storage for the ADAINV utility
function:
In the Space Calculation detail-view, select TEMP - ADAINV in the selection box.
Enter your requirements in the table and supply the password (if required). Click the button to calculate.
To calculate the space needed on TEMP storage for the ADALOD
LOAD/UPDATE utility function:
In the Space Calculation detail-view, select TEMP - ADALOD Load/Update in the selection box.
Enter your requirements in the table and supply the password (if required). Click the button to calculate.
To calculate the space needed on SORT for the ADALOD DELETE utility
function:
In the Space Calculation detail-view, select TEMP - ADALOD Delete in the selection box.
Enter your requirements in the table and supply the password (if required). Click the button to calculate.
The Work dataset requires the most estimating. Although many initial values may be arbitrary, keep a record of them to ensure that subsequent tuning of the Work parameters has a realistic basis. Results comprise block estimates for the three parts of the Work area. A total of these values in blocks and cylinders is also provided.
To calculate work dataset space:
In the Space Calculation detail-view, select WORK in the selection box.
Enter your requirements in the table and click the button to calculate.
