MELSRV MEDLINE AND MEDLINE DATABASES Z39.50 SERVER STATISTICS
Time period: 11/01/99 through 11/30/99
1.0 SUMMARY STATISTICS
_______________________
Relative use of MEDLINE AND MEDLINE databases:
Number of
Searches Records Presented
________ _________________
MED (current) 176,163 10,547,935
MED90 35,342 949,850
MED85 24,450 342,692
MED80 20,465 177,578
MED75 18,378 127,011
MED66 18,438 149,621
Per hour usage:
Time Searches Records Presented
_______________ _____________ _________________
12-2 a.m. 6,095 192,703
2-4 a.m. 2,072 52,274
4-6 a.m. 704 46,374
6-8 a.m. 3,286 156,957
8-10 a.m. 21,684 834,592
10-12 a.m. 46,953 2,015,639
12-2 p.m. 52,736 2,168,755
2-4 p.m. 60,628 2,483,550
4-6 p.m. 47,607 2,021,114
6-8 p.m. 24,162 1,120,429
8-10 p.m. 17,028 755,031
10-12 p.m. 10,281 447,269
__________ _____________ _________________
Total: 293,236 12,294,687
1.1 SEARCH commands
____________________
Zero results may indicate no access to the database
Number of SEARCH commands issued by location:
Location Total
________ _____
Berkeley 1,805
Davis 1,778
Irvine 617
Los Angeles 2,742
Riverside 172
San Diego 4,119
San Francisco 4,330
Santa Barbara 106
Santa Cruz 509
Lawrence Berkeley 512
Lawrence Livermore 243
Los Alamos 0
MELWEB 274,077
Other - UC 174
Other-Network UC 2,052
_____
293,236
1.2 Records Presented
______________________
Zero results may indicate no access to the database
Number of Records Presented by location:
Location Total
________ _____
Berkeley 19,938
Davis 24,290
Irvine 4,129
Los Angeles 32,944
Riverside 683
San Diego 20,513
San Francisco 46,939
Santa Barbara 1,185
Santa Cruz 664
Lawrence Berkeley 4,419
Lawrence Livermore 2,284
Los Alamos 0
MELWEB 12,115,289
Other - UC 151
Other-Network UC 21,259
_____
12,294,687
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 5.7
Present response time from receipt of present request
DLA until transmission of a present response:
Average in seconds 0.3
Standard deviation in seconds 0.7
2.0 MEDLINE AND MEDLINE Databases Detailed Statistics
_________________________________________
Median session length (minutes:seconds) 22:52
Average session length (minutes:seconds) 24:50
Longest session recorded (minutes:seconds) 272:08
Average number of searches completed per session 0.0
Retrievals per search - median 3.0
Retrievals per search - average 374.7
Retrievals per search - standard deviation 5025.2
Percent of searches completed with 0 results 31.3%
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 293,236 11.7%
PRESENT 2,102,239 84.1%
INIT or CLOSE 102,257 4.1%
OTHER 1,916 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 18,453 4.1% 7,534 40.8% 4 1019.1 11965.8
PERSONAL AUTHOR 87,671 19.6% 25,032 28.6% 7 73.4 552.5
TITLE WORD 32,953 7.4% 12,689 38.5% 3 161.5 2426.6
SUBSET 1,033 0.2% 254 24.6% 30 302.2 1518.8
SUBJECT WORD 1,846 0.4% 963 52.2% 11 761.4 3799.8
SUBJECT 11,072 2.5% 5,777 52.2% 19 527.7 3889.7
EXACT SUBJECT 23,698 5.3% 6,033 25.5% 30 485.5 2976.4
MAJOR SUBJECT 626 0.1% 268 42.8% 19 440.3 2008.2
EXACT MAJOR SUBJ 2,002 0.4% 406 20.3% 23 298.0 1190.9
EXACT TITLE 5,195 1.2% 2,717 52.3% 1 10.6 104.7
TREE NUMBER 9 0.0% 0 0.0% 18 90.8 126.2
EXACT JOURNAL 5,321 1.2% 2,200 41.3% 166 1308.2 3612.7
MAJOR TREE NUM 0 0.0% 0 0.0% 0 0.0 0.0
CAS 165 0.0% 103 62.4% 15 412.6 1418.7
KEYWORD 166495 37.3% 50,769 30.5% 19 706.4 6926.5
DATE 7,076 1.6% 1,583 22.4% 6 108.6 828.7
LANGUAGE 31,266 7.0% 8,641 27.6% 26 405.5 2545.2
UNIQUE ID 1,112 0.2% 237 21.3% 1 1.0 0.2
ADDED 3,411 0.8% 2,793 81.9% 8 18.7 34.9
PUB TYPE 12,785 2.9% 3,176 24.8% 20 155.3 1052.4
AUTHOR AFFIL. 2,903 0.7% 1,380 47.5% 8 102.3 897.0
CHEMICAL NAME 133 0.0% 79 59.4% 7 49.5 154.8
EXACT CHEMICAL 10 0.0% 4 40.0% 6 5.2 4.2
AT 28,309 6.3% 8,673 30.6% 22 576.6 3396.5
AGE 985 0.2% 184 18.7% 30 192.3 1045.7
ISN 1 0.0% 1 100% 0 0.0 0.0
ARTICLE 580 0.1% 125 21.6% 45 623.1 4277.4
XXS 821 0.2% 366 44.6% 19 1387.5 10194.0
XMXS 467 0.1% 274 58.7% 23 640.2 5180.7
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 109 0.0% 77 70.6% 20 303.0 783.3
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 96,622 32.9% 33,532 34.7% 9 324.5 2797.7
Single 196,614 67.0% 58,124 29.6% 16 645.6 7052.3
PRESENT commands, by type:
MARC 32.5%
OPAC 27.2%