MELSRV MEDLINE AND MEDLINE DATABASES Z39.50 SERVER STATISTICS
Time period: 09/01/99 through 09/30/99
1.0 SUMMARY STATISTICS
_______________________
Relative use of MEDLINE AND MEDLINE databases:
Number of
Searches Records Presented
________ _________________
MED (current) 157,160 8,851,755
MED90 32,060 844,163
MED85 20,533 309,069
MED80 16,285 156,676
MED75 14,179 101,297
MED66 13,891 118,372
Per hour usage:
Time Searches Records Presented
_______________ _____________ _________________
12-2 a.m. 3,174 102,775
2-4 a.m. 3,157 70,439
4-6 a.m. 910 44,111
6-8 a.m. 2,093 99,744
8-10 a.m. 19,718 768,613
10-12 a.m. 45,509 1,770,981
12-2 p.m. 46,087 1,847,187
2-4 p.m. 54,006 2,159,232
4-6 p.m. 41,210 1,687,693
6-8 p.m. 20,096 868,196
8-10 p.m. 11,392 599,580
10-12 p.m. 6,756 362,781
__________ _____________ _________________
Total: 254,108 10,381,332
1.1 SEARCH commands
____________________
Zero results may indicate no access to the database
Number of SEARCH commands issued by location:
Location Total
________ _____
Berkeley 3,159
Davis 1,570
Irvine 892
Los Angeles 3,811
Riverside 229
San Diego 6,896
San Francisco 5,300
Santa Barbara 185
Santa Cruz 253
Lawrence Berkeley 747
Lawrence Livermore 160
Los Alamos 0
MELWEB 227,377
Other - UC 390
Other-Network UC 3,139
_____
254,108
1.2 Records Presented
______________________
Zero results may indicate no access to the database
Number of Records Presented by location:
Location Total
________ _____
Berkeley 26,702
Davis 15,175
Irvine 14,284
Los Angeles 46,042
Riverside 1,640
San Diego 33,809
San Francisco 50,181
Santa Barbara 2,468
Santa Cruz 172
Lawrence Berkeley 3,245
Lawrence Livermore 647
Los Alamos 0
MELWEB 10,148,468
Other - UC 4,856
Other-Network UC 33,643
_____
10,381,332
1.3 Response time
__________________
Search response time from receipt of search request
DLA until transmission of search response:
Average in seconds 1.5
Standard deviation in seconds 6.9
Present response time from receipt of present request
DLA until transmission of a present response:
Average in seconds 0.4
Standard deviation in seconds 1.1
2.0 MEDLINE AND MEDLINE Databases Detailed Statistics
_________________________________________
Median session length (minutes:seconds) 22:58
Average session length (minutes:seconds) 25:11
Longest session recorded (minutes:seconds) 276:43
Average number of searches completed per session 254108
Retrievals per search - median 4.0
Retrievals per search - average 320.4
Retrievals per search - standard deviation 4179.1
Percent of searches completed with 0 results 29.1%
Percent of searches entered that are long 0.0%
Percent of long searches completed
(includes partial results) 100%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
SEARCH 254,108 11.6%
PRESENT 1,851,669 84.4%
INIT or CLOSE 87,001 4.0%
OTHER 1,335 0.1%
SEARCHes completed: RETRIEVALS PER NON-
TOTAL ZERO RESULTS ZERO RESULT SEARCHES
_____________ ______________ ______________________
% of % of
all all for Std.
No. SEARCHes No. Index Median Avg. Dev.
______ _________ ______ _______ ______ __________ _______
By index:
JOURNAL 18,374 4.9% 7,048 38.4% 4 712.9 8872.1
PERSONAL AUTHOR 85,952 22.7% 22,349 26.0% 6 72.7 578.2
TITLE WORD 27,415 7.3% 9,543 34.8% 4 193.8 1677.3
SUBSET 985 0.3% 216 21.9% 27 228.8 1572.5
SUBJECT WORD 1,643 0.4% 852 51.9% 13 997.1 6886.7
SUBJECT 9,188 2.4% 4,673 50.9% 21 714.9 3591.0
EXACT SUBJECT 20,429 5.4% 5,130 25.1% 35 452.8 2614.2
MAJOR SUBJECT 1,007 0.3% 404 40.1% 26 797.7 3710.3
EXACT MAJOR SUBJ 2,039 0.5% 459 22.5% 36 446.2 7654.9
EXACT TITLE 2,748 0.7% 1,644 59.8% 1 26.4 459.2
TREE NUMBER 1 0.0% 1 100% 0 0.0 0.0
EXACT JOURNAL 3,865 1.0% 1,327 34.3% 160 1239.3 2922.3
MAJOR TREE NUM 3 0.0% 2 66.7% 1,084 1084.0 0.0
CAS 111 0.0% 64 57.7% 20 108.2 298.9
KEYWORD 134752 35.7% 39,651 29.4% 18 583.0 5847.1
DATE 7,841 2.1% 1,837 23.4% 5 125.2 1137.8
LANGUAGE 25,084 6.6% 6,755 26.9% 28 356.7 2472.1
UNIQUE ID 1,092 0.3% 236 21.6% 1 6.6 156.7
ADDED 2,034 0.5% 1,274 62.6% 6 19.6 37.1
PUB TYPE 11,202 3.0% 2,780 24.8% 21 130.1 645.3
AUTHOR AFFIL. 2,554 0.7% 1,169 45.8% 8 99.7 1248.5
CHEMICAL NAME 106 0.0% 73 68.9% 5 54.3 157.7
EXACT CHEMICAL 24 0.0% 22 91.7% 4 4.0 1.4
AT 16,242 4.3% 4,789 29.5% 24 506.1 2938.9
AGE 1,284 0.3% 270 21.0% 27 154.0 586.5
ISN 0 0.0% 0 0.0% 0 0.0 0.0
ARTICLE 561 0.1% 158 28.2% 47 330.3 1443.1
XXS 852 0.2% 387 45.4% 22 1560.3 8193.5
XMXS 395 0.1% 166 42.0% 22 1097.4 7066.7
XS 2 0 0.0% 0 0.0% 0 0.0 0.0
MXS 2 0 0.0% 0 0.0% 0 0.0 0.0
Other indexes 60 0.0% 52 86.7% 55 2071.0 5657.5
RETRIEVALS PER NON-
TOTAL ZERO RESULTS ZERO RESULT SEARCHES
_____________ ______________ ______________________
% of % of
all all for Std.
No. SEARCHes No. Index Median Avg. Dev.
______ _________ ______ _______ ______ __________ _______
By number of indexes:
Multiple 78,284 30.8% 25,759 32.9% 8 266.5 2461.0
Single 175,824 69.2% 48,089 27.3% 15 527.7 5670.0
PRESENT commands, by type:
MARC 35.5%
OPAC 26.7%