Interstage Shunsaku Data Manager Application Development Guide - Microsoft(R) Windows(R) 2000/ Microsoft(R) Windows Server(TM) 2003 - - UNIX -

D.3 Estimating Local Memory Requirements when C APIs are Used

Use the following procedure to obtain an approximate estimate of the amount of memory used by the Shunsaku APIs when an application runs.

The following table shows the formulas for estimating the memory requirements when C APIs are used.

[Table D-4 List of Memory Requirements when C APIs are Used]

Application usage	Variable elements	Estimation formula (kilobytes)
Looking up data	Maximum data length of a single XML or text format record to be obtained Number of data items displayed on a single screen Number of concurrent processes	Maximum data length of a single XML or text format record to be obtained (kilobytes) x number of data items displayed on a single screen x number of concurrent processes
Updating data	Maximum data length of a single XML format record to be added Number of data items added with a single ShunInsert call Number of concurrent processes	Maximum data length of a single XML format record to be added (kilobytes) x number of data items added with a single ShunInsert call x number of concurrent processes

Example Calculation

An estimation example of the local memory requirements when C APIs are used is as follows:

If the variable elements are as follows:

• Maximum data length of a single XML or text format record to be obtained: 1 KB
• Maximum data length of a single XML format record to be added: 1 KB
• Number of data items displayed on a single screen: 100
• Number of data items added with a single ShunInsert call: 100
• Number of concurrent processes: 100

Looking up data

1 x 100 x 100 = 10,000 KB (approx. 10 MB)

Updating data

1 x 100 x 100 = 10,000 KB (approx. 10 MB)

Local memory allocated by applications is required in addition to the above.