MELSRV MEDLINE AND MEDLINE DATABASES Z39.50 SERVER STATISTICS
Time period: 03/01/99 through 03/31/99
1.0 SUMMARY STATISTICS
_______________________
Relative use of MEDLINE AND MEDLINE databases:
Number of
Searches Records Presented
________ _________________
MED (current) 183,974 10,662,019
MED90 27,281 814,461
MED85 14,567 328,467
MED80 8,648 160,233
MED75 5,453 90,837
MED66 4,880 93,321
Per hour usage:
Time Searches Records Presented
_______________ _____________ _________________
12-2 a.m. 2,617 154,352
2-4 a.m. 1,646 61,226
4-6 a.m. 598 33,036
6-8 a.m. 2,874 116,193
8-10 a.m. 18,603 867,669
10-12 a.m. 39,458 1,913,034
12-2 p.m. 42,793 2,090,637
2-4 p.m. 50,246 2,425,042
4-6 p.m. 41,616 2,099,028
6-8 p.m. 21,769 1,172,171
8-10 p.m. 14,267 760,343
10-12 p.m. 8,316 456,607
__________ _____________ _________________
Total: 244,803 12,149,338
1.1 SEARCH commands
____________________
Zero results may indicate no access to the database
Number of SEARCH commands issued by location:
Location Total
________ _____
Berkeley 2,929
Davis 2,012
Irvine 1,297
Los Angeles 3,681
Riverside 144
San Diego 5,262
San Francisco 6,945
Santa Barbara 259
Santa Cruz 155
Lawrence Berkeley 371
Lawrence Livermore 176
Los Alamos 0
MELWEB 217,283
Other - UC 444
Other-Network UC 3,845
_____
244,803
1.2 Records Presented
______________________
Zero results may indicate no access to the database
Number of Records Presented by location:
Location Total
________ _____
Berkeley 21,075
Davis 16,120
Irvine 9,305
Los Angeles 35,598
Riverside 1,688
San Diego 27,594
San Francisco 69,673
Santa Barbara 1,096
Santa Cruz 383
Lawrence Berkeley 2,201
Lawrence Livermore 5,472
Los Alamos 0
MELWEB 11,917,367
Other - UC 13,376
Other-Network UC 28,390
_____
12,149,338
1.3 Response time
__________________
Search response time from receipt of search request
DLA until transmission of search response:
Average in seconds 2.1
Standard deviation in seconds 9.1
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) 24:27
Average session length (minutes:seconds) 27:15
Longest session recorded (minutes:seconds) 301:39
Average number of searches completed per session 0.0
Retrievals per search - median 5.0
Retrievals per search - average 454.5
Retrievals per search - standard deviation 5092.9
Percent of searches completed with 0 results 27.1%
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 244,803 9.7%
PRESENT 2,226,629 87.9%
INIT or CLOSE 59,528 2.3%
OTHER 2,171 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 19,245 5.0% 8,843 45.9% 4 923.6 4454.6
PERSONAL AUTHOR 82,098 21.5% 23,131 28.2% 7 99.9 873.3
TITLE WORD 29,586 7.7% 11,373 38.4% 4 230.0 2481.1
SUBSET 817 0.2% 174 21.3% 43 250.3 942.6
SUBJECT WORD 3,721 1.0% 2,159 58.0% 16 1526.6 8404.2
SUBJECT 9,770 2.6% 4,448 45.5% 26 638.1 5533.4
EXACT SUBJECT 21,471 5.6% 4,906 22.8% 42 702.0 5256.2
MAJOR SUBJECT 745 0.2% 252 33.8% 22 676.1 10644.5
EXACT MAJOR SUBJ 2,156 0.6% 392 18.2% 21 280.7 2228.9
EXACT TITLE 1,954 0.5% 1,193 61.1% 1 56.0 415.8
TREE NUMBER 0 0.0% 0 0.0% 0 0.0 0.0
EXACT JOURNAL 4,360 1.1% 1,525 35.0% 275 1494.4 2977.3
MAJOR TREE NUM 1 0.0% 0 0.0% 5 5.0 0.0
CAS 58 0.0% 26 44.8% 215 1950.5 7247.2
KEYWORD 127569 33.4% 29,370 23.0% 23 815.1 7418.7
DATE 10,192 2.7% 3,191 31.3% 6 140.4 1021.4
LANGUAGE 27,408 7.2% 6,446 23.5% 37 587.4 4119.8
UNIQUE ID 812 0.2% 121 14.9% 1 1.0 0.1
ADDED 686 0.2% 313 45.6% 7 29.5 60.9
PUB TYPE 10,958 2.9% 2,100 19.2% 30 208.9 876.9
AUTHOR AFFIL. 3,735 1.0% 1,825 48.9% 8 111.5 806.6
CHEMICAL NAME 65 0.0% 45 69.2% 15 354.8 845.3
EXACT CHEMICAL 19 0.0% 13 68.4% 176 407.8 489.1
AT 21,488 5.6% 5,590 26.0% 30 756.7 5288.6
AGE 1,059 0.3% 284 26.8% 23 154.6 440.1
ISN 7 0.0% 7 100% 0 0.0 0.0
ARTICLE 612 0.2% 127 20.8% 46 443.1 2159.7
XXS 925 0.2% 382 41.3% 22 762.4 3097.4
XMXS 341 0.1% 145 42.5% 41 859.7 3105.3
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 5 0.0% 1 20.0% 2,492 2482.8 2837.4
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 86,419 35.3% 27,634 32.0% 11 449.0 3890.5
Single 158,384 64.7% 38,700 24.4% 18 709.0 6741.0
PRESENT commands, by type:
MARC 33.5%
OPAC 28.2%