MELSRV MEDLINE AND MEDLINE DATABASES Z39.50 SERVER STATISTICS
Time period: 04/01/99 through 04/30/99
1.0 SUMMARY STATISTICS
_______________________
Relative use of MEDLINE AND MEDLINE databases:
Number of
Searches Records Presented
________ _________________
MED (current) 173,840 9,972,231
MED90 27,352 1,003,040
MED85 13,567 373,453
MED80 7,740 203,305
MED75 5,032 123,931
MED66 4,585 101,859
Per hour usage:
Time Searches Records Presented
_______________ _____________ _________________
12-2 a.m. 2,753 126,072
2-4 a.m. 1,471 40,124
4-6 a.m. 465 25,111
6-8 a.m. 2,117 102,153
8-10 a.m. 16,960 823,817
10-12 a.m. 37,933 1,832,818
12-2 p.m. 40,957 2,082,916
2-4 p.m. 48,693 2,328,329
4-6 p.m. 38,736 1,986,880
6-8 p.m. 20,394 1,164,865
8-10 p.m. 13,309 798,527
10-12 p.m. 8,328 466,207
__________ _____________ _________________
Total: 232,116 11,777,819
1.1 SEARCH commands
____________________
Zero results may indicate no access to the database
Number of SEARCH commands issued by location:
Location Total
________ _____
Berkeley 3,078
Davis 2,257
Irvine 966
Los Angeles 2,670
Riverside 76
San Diego 3,369
San Francisco 6,379
Santa Barbara 134
Santa Cruz 273
Lawrence Berkeley 135
Lawrence Livermore 48
Los Alamos 0
MELWEB 208,681
Other - UC 585
Other-Network UC 3,465
_____
232,116
1.2 Records Presented
______________________
Zero results may indicate no access to the database
Number of Records Presented by location:
Location Total
________ _____
Berkeley 23,033
Davis 22,563
Irvine 9,740
Los Angeles 29,448
Riverside 456
San Diego 15,257
San Francisco 55,157
Santa Barbara 716
Santa Cruz 390
Lawrence Berkeley 1,563
Lawrence Livermore 548
Los Alamos 0
MELWEB 11,582,727
Other - UC 12,851
Other-Network UC 23,370
_____
11,777,819
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 0.3
Standard deviation in seconds 0.7
2.0 MEDLINE AND MEDLINE Databases Detailed Statistics
_________________________________________
Median session length (minutes:seconds) 24:26
Average session length (minutes:seconds) 27:16
Longest session recorded (minutes:seconds) 254:07
Average number of searches completed per session 0.0
Retrievals per search - median 5.0
Retrievals per search - average 446.5
Retrievals per search - standard deviation 4865.4
Percent of searches completed with 0 results 27.4%
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 232,116 9.5%
PRESENT 2,151,688 88.2%
INIT or CLOSE 55,772 2.3%
OTHER 1,173 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 18,122 5.0% 8,053 44.4% 4 703.7 3054.2
PERSONAL AUTHOR 74,695 20.7% 21,080 28.2% 8 89.5 853.1
TITLE WORD 27,524 7.6% 10,718 38.9% 4 186.4 1656.8
SUBSET 763 0.2% 156 20.4% 35 937.7 6714.4
SUBJECT WORD 3,774 1.0% 2,156 57.1% 15 2749.9 17719.2
SUBJECT 9,450 2.6% 4,533 48.0% 23 751.0 4797.3
EXACT SUBJECT 19,587 5.4% 4,118 21.0% 49 669.7 3107.4
MAJOR SUBJECT 683 0.2% 270 39.5% 19 290.4 1012.6
EXACT MAJOR SUBJ 2,189 0.6% 379 17.3% 25 204.5 592.3
EXACT TITLE 2,293 0.6% 1,264 55.1% 1 14.3 147.6
TREE NUMBER 0 0.0% 0 0.0% 0 0.0 0.0
EXACT JOURNAL 4,036 1.1% 1,386 34.3% 307 1576.1 3278.7
MAJOR TREE NUM 0 0.0% 0 0.0% 0 0.0 0.0
CAS 74 0.0% 27 36.5% 15 61.6 88.7
KEYWORD 123524 34.2% 29,321 23.7% 24 792.6 6955.7
DATE 7,955 2.2% 2,623 33.0% 9 228.7 3815.4
LANGUAGE 26,015 7.2% 5,932 22.8% 40 662.1 4643.0
UNIQUE ID 875 0.2% 130 14.9% 1 3.5 66.6
ADDED 1,096 0.3% 889 81.1% 6 20.6 46.8
PUB TYPE 10,103 2.8% 2,007 19.9% 28 229.3 1911.4
AUTHOR AFFIL. 3,055 0.8% 1,430 46.8% 9 123.1 1079.9
CHEMICAL NAME 73 0.0% 43 58.9% 9 311.1 1080.3
EXACT CHEMICAL 19 0.0% 14 73.7% 22 44.2 57.4
AT 22,826 6.3% 6,131 26.9% 38 841.3 5223.0
AGE 1,044 0.3% 256 24.5% 28 174.8 554.8
ISN 3 0.0% 3 100% 0 0.0 0.0
ARTICLE 594 0.2% 100 16.8% 58 482.7 2346.2
XXS 741 0.2% 336 45.3% 29 845.5 3298.2
XMXS 351 0.1% 167 47.6% 24 510.8 2018.8
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 10 0.0% 5 50.0% 11,096 11096.0 0.0
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 81,372 35.1% 26,268 32.3% 12 473.7 3838.3
Single 150,744 64.9% 37,422 24.8% 18 684.3 6415.2
PRESENT commands, by type:
MARC 31.9%
OPAC 28.8%