Compaq 108164-003 - ProLiant - 800 White Paper page 8

Page 4 Configuration and Tuning of Sybase System 11 for NetWare on Compaq Servers
Monitor Server
Total
Total in MB
48 MB SQL Server + 4 MB Backup Server + 2 MB Monitor Server = 54 MB total System
11
Add to this 51KB for each user connection beyond the initial default of 25 user connections. The
value of 51KB per user connection may need to be increased depending upon if you also
increased the user stack size and the default network packet size. Refer to the sections later in
this document for a discussion on the implications of altering the user stack size and the default
network packet size. Lets assume an additional 50 users, for a total of 75 user connections, at the
default allocation of 51KB per user.
50 additional users * 51 KB per user connection = 2550 KB 2.5 MB
For each database device beyond the initial 10 devices add another 0.5KB. For our example here
lets assume the addition of 12 more devices.
12 additional devices * 0.5 KB per device = 6 KB
The type of transactions we are planning to execute will be transferring large amounts of data
between the client and server. To reduce the number of packets transferred on the network we
will increase the max network packet size from 512 to 4096 bytes. Each user connection requires
3 packet buffers. We will need to increase the setting for additional network memory to meet this
requirement.
75 user connections * 3 buffers per user * 4096 bytes + 2% overhead = 940032 bytes 0.9
MB
At this time we don't know how much memory will be required as procedure and data cache. We
do know that we have approximately 5 GB worth of data. Lets' assume that we want 5% of the
data in the data cache. Theoretically you could increase the amount memory in the system so the
entire database would fit in memory, resulting in hopefully some rather phenomenal
performance. But typically most databases are larger than the available memory of the server.
5% data in cache * 5 GB = 0.25GB = 256 MB
So the initial estimate of how much memory is required by this implementation is:
Estimate of Sybase System 11 Memory Requirement
Sybase System 11
50 additional users
12 additional devices
additional network memory
5% of data in cache
Total in MB
Total in NetWare 4KB buffers
1996 Compaq Computer Corporation, All Rights Reserved
For Sybase Monitor Server
Module
allocated by
NetWare 4KB buffers
453
453
0.6 MB
memory in MB
54.0
2.5
0.6
0.9
256.0
314.0
80,384
Doc No 140A/0896
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