Interstage Shunsaku Data Manager Operator's Guide - Microsoft(R) Windows(R) 2000/ Microsoft(R) Windows Server(TM) 2003 - - UNIX -

D.5.3 Memory Requirements for Searchers

This section explains the formulas for estimating how much memory searchers will use.

Shared Memory

The shared memory requirement is shown below.

Definition unit	Variable elements	Size (bytes)
The area for storing command information	Fixed	1,000,000

Local Memory

The formulas for estimating local memory are shown below.

Definition unit	Variable elements	Size (bytes)
Fixed memory	None	14,000,000
Memory allocated for real data	Average record size Number of records allocated to the searcher (*1)	(Average record size + 30) x number of records allocated to the searcher
The area for storing search requests (*2)	Average number of bytes in a keyword (*3) The maximum number of search requests that can be received at the same time (*4)	(Average number of bytes in a keyword x 1,152) x the maximum number of search requests that can be received simultaneously
The area for storing update requests	Average record size Average number of update records within a transaction (*5) Maximum number of transactions (*6)	((Average record size + 50) x average number of update records within a transaction + 1600) x maximum number of transactions
The area for storing hit results	Number of records allocated to the searcher (*1) The maximum number of search requests that can be received at the same time (*4)	(Number of records allocated to the searcher + 10) x the maximum number of search requests that can be received at the same time

*1) Specify the number of records of search data allocated to the searcher.

*2) Note the following three points:

• The minimum value that can be used is 10 MB. If the calculated size exceeds 10 MB, it will be rounded up to the nearest multiple of 10 MB.
• When searches are executed using partial character specifications, character range specifications or numeric range specifications, the formula changes as follows:
  (number of partial characters or character range or numeric range x average number of bytes in a keyword x 1,152) x the maximum number of search requests that can be received at the same time
• When searches are executed using a combination of partial character specifications, character range specifications and numeric range specifications, the formula changes as follows:
  (number of partial characters x character range x numeric range x average number of bytes in a keyword x 1,152) x the maximum number of search requests that can be received at the same time

*3) Specify the average number of bytes in keywords specified in search expressions. If more than one keyword is specified in a search expression, specify the average number of total bytes of these keywords.

*4) This is specified in the MultiMax parameter in the director environment file.

*5) Specify the average number of records to be updated per transaction.

*6) Specify the maximum number of transactions to be executed simultaneously.

Example Calculation

An example calculation for local memory is shown below.

If the variable elements are as follows:

• Average record size: 4,000 (bytes)
• Number of records allocated to the searcher: 10,000
• Average size of search expressions: 200 (bytes)
• Average number of characters in keywords: 80(bytes)
• The maximum number of search requests that can be received at the same time: 100
• Average number of update records within a transaction: 10
• Maximum number of transactions: 100

Memory allocated for real data

(4,000 + 30) x 10,000 = 40,300,000 bytes (approx. 40MB)

The area for storing search requests

(80 x 1,152) x 100 = 9,216,000 bytes (approx. 8.8 MB) ->10MB

The area for storing update requests

((4,000 + 50) x 10 + 1,600) x 100 = 4,210,000 bytes (approx. 4.2 MB)

The area for storing hit results

(10,000 + 10) x 100 = 1,001,000 bytes (approx. 1 MB)