Cabletron Systems T2015 Guía de instalación descargar pdf (Pagina 336)

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326 Installation Guide for Clients

5 LockRead and WriteUnlock as follows:

0 = never 1 = always 2 = only on a LAN Manager VC

The default is 1.

The following diagrams illustrate this option for a database. The first

diagram illustrates what happens when LockRead and WriteUnlock is

set to 0:

Workstation Server

lock

OK, it’s locked

read

OK, here is your data

(update data record)

write

OK, data written

unlock

OK, it’s unlocked

This diagram illustrates what happens when LockRead and

WriteUnlock is set to the default of 1:

Workstation Server

LockRead

OK, it’s locked and here is your data

(update data record)

WriteUnlock

OK, it’s written and unlocked

Some applications use a dummy file to control the real database file

(this means the application locks file A and reads file B). Data read

along with the lock on file A is never used. On a high-speed network

this extra reading should not matter, but on a slow network it could

mean a time loss. If you have a slow network and regularly use a

database that uses a dummy file, consider setting this heuristic to 0.

6 Use Open and Read.

Set to 1, this heuristic combines Open and Read to get the first portion

of a file at the same time the file is opened. This is faster because most

files are read sequentially. For files that are not read sequentially, little

performance is lost on a high-speed network. On a slow network, set

this heuristic to 0 if you use many applications that read files randomly.

The default is 1.

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