MELSRV MEDLINE AND MEDLINE DATABASES Z39.50 SERVER STATISTICS
Time period: 02/01/99 through 02/28/99
1.0 SUMMARY STATISTICS
_______________________
Relative use of MEDLINE AND MEDLINE databases:
Number of
Searches Records Presented
________ _________________
MED (current) 172,776 10,210,527
MED90 23,246 634,716
MED85 14,111 297,022
MED80 8,148 135,933
MED75 5,166 85,028
MED66 4,808 83,752
Per hour usage:
Time Searches Records Presented
_______________ _____________ _________________
12-2 a.m. 2,841 174,513
2-4 a.m. 1,202 62,134
4-6 a.m. 511 46,231
6-8 a.m. 2,413 140,939
8-10 a.m. 16,298 731,252
10-12 a.m. 36,360 1,854,105
12-2 p.m. 39,547 1,991,167
2-4 p.m. 47,885 2,309,519
4-6 p.m. 39,259 1,878,378
6-8 p.m. 20,437 1,100,160
8-10 p.m. 13,444 691,676
10-12 p.m. 8,058 466,904
__________ _____________ _________________
Total: 228,255 11,446,978
1.1 SEARCH commands
____________________
Zero results may indicate no access to the database
Number of SEARCH commands issued by location:
Location Total
________ _____
Berkeley 2,346
Davis 3,861
Irvine 1,169
Los Angeles 2,596
Riverside 179
San Diego 4,368
San Francisco 5,362
Santa Barbara 117
Santa Cruz 632
Lawrence Berkeley 1,109
Lawrence Livermore 88
Los Alamos 0
MELWEB 202,840
Other - UC 798
Other-Network UC 2,790
_____
228,255
1.2 Records Presented
______________________
Zero results may indicate no access to the database
Number of Records Presented by location:
Location Total
________ _____
Berkeley 13,447
Davis 22,931
Irvine 11,283
Los Angeles 30,165
Riverside 859
San Diego 23,799
San Francisco 53,086
Santa Barbara 1,129
Santa Cruz 6,692
Lawrence Berkeley 3,581
Lawrence Livermore 696
Los Alamos 0
MELWEB 11,239,575
Other - UC 16,498
Other-Network UC 23,237
_____
11,446,978
1.3 Response time
__________________
Search response time from receipt of search request
DLA until transmission of search response:
Average in seconds 2.2
Standard deviation in seconds 8.2
Present response time from receipt of present request
DLA until transmission of a present response:
Average in seconds 0.3
Standard deviation in seconds 0.8
2.0 MEDLINE AND MEDLINE Databases Detailed Statistics
_________________________________________
Median session length (minutes:seconds) 24:58
Average session length (minutes:seconds) 28:31
Longest session recorded (minutes:seconds) 368:37
Average number of searches completed per session 0.0
Retrievals per search - median 5.0
Retrievals per search - average 507.1
Retrievals per search - standard deviation 5612.5
Percent of searches completed with 0 results 27.7%
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 228,255 9.3%
PRESENT 2,181,416 88.5%
INIT or CLOSE 53,269 2.2%
OTHER 1,146 0.0%
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 17,270 4.8% 7,993 46.3% 5 1011.2 8395.0
PERSONAL AUTHOR 74,449 20.7% 21,349 28.7% 8 121.6 1463.2
TITLE WORD 28,097 7.8% 11,199 39.9% 4 280.6 4138.7
SUBSET 900 0.2% 226 25.1% 48 640.6 3314.8
SUBJECT WORD 3,362 0.9% 1,800 53.5% 21 2545.9 12020.4
SUBJECT 9,616 2.7% 4,914 51.1% 25 696.1 4740.8
EXACT SUBJECT 20,946 5.8% 4,753 22.7% 46 779.7 4617.1
MAJOR SUBJECT 735 0.2% 255 34.7% 34 347.0 1671.2
EXACT MAJOR SUBJ 2,169 0.6% 438 20.2% 21 306.1 2533.5
EXACT TITLE 2,047 0.6% 1,177 57.5% 1 43.4 670.7
TREE NUMBER 2 0.0% 0 0.0% 88 87.5 47.4
EXACT JOURNAL 4,401 1.2% 1,609 36.6% 276 1719.6 3515.2
MAJOR TREE NUM 0 0.0% 0 0.0% 0 0.0 0.0
CAS 32 0.0% 20 62.5% 5 641.1 1150.5
KEYWORD 119867 33.3% 28,221 23.5% 25 902.0 7990.6
DATE 9,385 2.6% 3,155 33.6% 6 166.6 1332.7
LANGUAGE 26,788 7.4% 6,465 24.1% 42 690.3 4846.8
UNIQUE ID 749 0.2% 77 10.3% 1 6.7 146.3
ADDED 550 0.2% 320 58.2% 13 487.8 4146.1
PUB TYPE 10,552 2.9% 2,204 20.9% 29 207.0 860.3
AUTHOR AFFIL. 3,122 0.9% 1,501 48.1% 8 232.8 2588.0
CHEMICAL NAME 52 0.0% 29 55.8% 22 94.3 132.6
EXACT CHEMICAL 31 0.0% 19 61.3% 17 225.7 731.7
AT 22,427 6.2% 6,081 27.1% 34 863.1 5534.3
AGE 1,125 0.3% 249 22.1% 28 146.8 423.7
ISN 5 0.0% 5 100% 0 0.0 0.0
ARTICLE 610 0.2% 162 26.6% 35 553.8 2922.2
XXS 595 0.2% 275 46.2% 57 2296.3 17779.6
XMXS 422 0.1% 191 45.3% 41 719.3 4228.2
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 12 0.0% 6 50.0% 27 15070.5 23324.3
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 80,475 35.3% 26,157 32.5% 12 554.0 4907.6
Single 147,780 64.7% 37,105 25.1% 19 774.0 7275.0
PRESENT commands, by type:
MARC 31.9%
OPAC 30.9%