MELSRV MEDLINE AND MEDLINE DATABASES Z39.50 SERVER STATISTICS
Time period: 06/01/99 through 06/30/99
1.0 SUMMARY STATISTICS
_______________________
Relative use of MEDLINE AND MEDLINE databases:
Number of
Searches Records Presented
________ _________________
MED (current) 145,478 6,956,455
MED90 24,844 678,353
MED85 12,397 247,433
MED80 7,098 113,513
MED75 4,615 71,779
MED66 4,369 84,659
Per hour usage:
Time Searches Records Presented
_______________ _____________ _________________
12-2 a.m. 2,351 97,967
2-4 a.m. 3,098 68,315
4-6 a.m. 479 32,186
6-8 a.m. 2,074 104,808
8-10 a.m. 16,566 615,695
10-12 a.m. 35,525 1,402,426
12-2 p.m. 34,702 1,441,474
2-4 p.m. 43,048 1,709,937
4-6 p.m. 30,948 1,371,616
6-8 p.m. 14,789 641,056
8-10 p.m. 9,115 399,562
10-12 p.m. 6,106 267,150
__________ _____________ _________________
Total: 198,801 8,152,192
1.1 SEARCH commands
____________________
Zero results may indicate no access to the database
Number of SEARCH commands issued by location:
Location Total
________ _____
Berkeley 2,323
Davis 2,489
Irvine 356
Los Angeles 3,789
Riverside 108
San Diego 3,536
San Francisco 6,315
Santa Barbara 320
Santa Cruz 383
Lawrence Berkeley 40
Lawrence Livermore 26
Los Alamos 6
MELWEB 174,965
Other - UC 1,857
Other-Network UC 2,288
_____
198,801
1.2 Records Presented
______________________
Zero results may indicate no access to the database
Number of Records Presented by location:
Location Total
________ _____
Berkeley 14,989
Davis 15,569
Irvine 675
Los Angeles 38,636
Riverside 511
San Diego 23,643
San Francisco 48,807
Santa Barbara 6,125
Santa Cruz 65
Lawrence Berkeley 1,042
Lawrence Livermore 651
Los Alamos 1
MELWEB 7,919,505
Other - UC 45,151
Other-Network UC 36,822
_____
8,152,192
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 6.0
Present response time from receipt of present request
DLA until transmission of a present response:
Average in seconds 0.3
Standard deviation in seconds 0.6
2.0 MEDLINE AND MEDLINE Databases Detailed Statistics
_________________________________________
Median session length (minutes:seconds) 23:46
Average session length (minutes:seconds) 25:56
Longest session recorded (minutes:seconds) 264:45
Average number of searches completed per session 0.0
Retrievals per search - median 5.0
Retrievals per search - average 460.6
Retrievals per search - standard deviation 4917.5
Percent of searches completed with 0 results 26.6%
Percent of searches entered that are long 0.1%
Percent of long searches completed
(includes partial results) 100%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
SEARCH 198,801 11.0%
PRESENT 1,548,322 86.0%
INIT or CLOSE 51,995 2.9%
OTHER 607 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 16,821 5.7% 6,977 41.5% 4 712.8 3364.5
PERSONAL AUTHOR 74,348 25.2% 19,846 26.7% 7 99.7 1921.5
TITLE WORD 23,858 8.1% 8,621 36.1% 4 230.5 2129.6
SUBSET 622 0.2% 134 21.5% 32 480.6 2704.1
SUBJECT WORD 2,451 0.8% 1,458 59.5% 18 3115.3 20493.0
SUBJECT 7,432 2.5% 3,214 43.2% 24 2877.0 14142.7
EXACT SUBJECT 12,785 4.3% 2,747 21.5% 38 607.1 4636.7
MAJOR SUBJECT 532 0.2% 159 29.9% 22 205.2 668.6
EXACT MAJOR SUBJ 1,358 0.5% 264 19.4% 24 437.4 3728.3
EXACT TITLE 1,924 0.7% 1,047 54.4% 1 7.9 68.2
TREE NUMBER 7 0.0% 0 0.0% 168 136.6 67.3
EXACT JOURNAL 3,385 1.1% 1,121 33.1% 230 1266.3 2661.4
MAJOR TREE NUM 0 0.0% 0 0.0% 0 0.0 0.0
CAS 44 0.0% 35 79.5% 26 2675.0 7353.5
KEYWORD 98,022 33.2% 23,157 23.6% 21 755.7 6479.0
DATE 7,183 2.4% 2,107 29.3% 7 135.7 1593.4
LANGUAGE 17,435 5.9% 3,921 22.5% 33 533.7 3340.4
UNIQUE ID 660 0.2% 69 10.5% 1 1.0 0.5
ADDED 1,814 0.6% 798 44.0% 6 19.3 45.6
PUB TYPE 7,269 2.5% 1,238 17.0% 28 199.3 1032.5
AUTHOR AFFIL. 2,606 0.9% 1,223 46.9% 8 100.5 951.7
CHEMICAL NAME 69 0.0% 42 60.9% 22 994.3 2859.7
EXACT CHEMICAL 9 0.0% 7 77.8% 7 7.0 0.0
AT 12,570 4.3% 3,308 26.3% 28 726.2 5427.3
AGE 642 0.2% 135 21.0% 31 221.8 606.7
ISN 2 0.0% 2 100% 0 0.0 0.0
ARTICLE 420 0.1% 93 22.1% 47 350.3 1287.6
XXS 720 0.2% 281 39.0% 24 1527.7 7139.0
XMXS 292 0.1% 120 41.1% 23 2403.2 14771.6
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 26 0.0% 13 50.0% 5 5011.7 10079.3
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 64,722 32.6% 20,457 31.6% 8 359.0 3843.4
Single 134,079 67.4% 32,346 24.1% 17 743.9 6374.4
PRESENT commands, by type:
MARC 38.5%
OPAC 27.9%