Table 5 Acronyms used in load analysis

N _cr, N _ps, N _fs

Average number of different visited sites per session, of parallel sessions per client, and of finished unshipped clickstream records

S _cr, S _CST, S _SDT, S _SCD

Average size of clickstream record, of clickstream table, shipdata table, and database

S _SID , S _Flag , S _time , S _IP

Size of session id, of flag, of time stamp, and of IP address

N _dv

Number of daily visitors to a cooperating server

T _bs

Length of a browsing session on a server in seconds

N _CU

Average number of concurrent users

T _rs

Average time it takes for clickstream to be ready to ship to Base Server

μ _p , μ _N

Number of requests per second that processor can serve, and NIC can handle

M _u , M _T

Amount of memory used by server, and total memory

ρ _P , ρ _M , ρ _N

Processor, memory, and network utilizations

λ _P , λ _M , λ _N

Frequency (rate) of requests at the processor, for the memory, and for the NIC

λ _r , λ _a , λ _c

Frequency of record transfers, analysis process executions, and user requests

N _N , N _a , N _c

Number of concurrent transfer requests waiting on the NIC, analysis processes execution events, and client requests

B, R _CS

Bandwidth, and average bitrate of the Base Server’s NIC

T _q , T _d, c _a , c _w

Query formulation, DB query execution, and thread context switch times

T _tap

Period of traffic analysis process at the Base Server

ST

Thread stack size

S _q

Combined size of the client query and the resultant database query

H _a , H _c

Memory for click stream records, and for processing client requests

N _l , N _u

Number of records used by analysis process, and transferred from First Servers and not yet processed by Base Server

N _FS

Average number of associated First Servers per Base Server

N _TXfb

Average number of transfers from a First Server to the Base Server