MELVYL IAC DATABASES TELNET STATISTICS
Time period: 03/01/99 through 03/31/99
1.0 SUMMARY STATISTICS
_______________________
1.1 Total sessions:
____________________
Location Library Remote Total
________ _______ ______ _____
Berkeley 3,140 4,776 7,916
Davis 4,871 191 5,062
Irvine 4,957 0 4,957
Los Angeles 943 4,331 5,274
Riverside 4,993 340 5,333
San Diego 274 1,797 2,071
San Francisco 580 27 607
Santa Barbara 3,914 841 4,755
Santa Cruz 4,251 1,353 5,604
LBL 0 192 192
LLL 0 71 71
Los Alamos n/a 12 12
Other - UC 45 888 933
Stanford 1,018
Other-Network UC n/a 1,594 1,594
_______ ______ _____
27,968 16,413 45,399
Per hour usage:
Time Sessions Finds Records Displayed
__________ __________ __________ _________________
12-2 a.m. 651 2,583 32,718
2-4 a.m. 173 545 7,742
4-6 a.m. 93 208 2,657
6-8 a.m. 427 1,064 11,239
8-10 a.m. 2,598 7,970 83,164
10-12 a.m. 6,344 22,022 229,904
12-2 p.m. 8,472 28,987 302,582
2-4 p.m. 9,965 35,483 353,099
4-6 p.m. 7,051 25,902 267,123
6-8 p.m. 4,105 14,876 162,871
8-10 p.m. 3,603 13,274 153,718
10-12 p.m. 1,917 7,762 96,798
__________ __________ __________ _________________
Total: 45,399 160,676 1,703,615
1.2 FIND commands
__________________
Number of FIND commands issued by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 11,149 15,338 26,487
Davis 15,563 539 16,102
Irvine 17,454 0 17,454
Los Angeles 3,345 15,788 19,133
Riverside 19,605 1,123 20,728
San Diego 833 6,184 7,017
San Francisco 1,626 69 1,695
Santa Barbara 14,280 2,974 17,254
Santa Cruz 16,721 4,108 20,829
LBL 0 541 541
LLL 0 164 164
Los Alamos n/a 52 52
Other - UC 116 3,349 3,465
Stanford 4,097
Other-Network UC n/a 5,658 5,658
_______ ______ _____
100,692 55,887 160,676
Number of FIND commands by database
MAGS database 142,617
NEWS database 14,526
COMP database 3,533
Total number of FIND commands 160,676
1.3 Records displayed
______________________
Number of Records Displayed by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 121,940 180,546 302,486
Davis 140,088 4,694 144,782
Irvine 146,772 0 146,772
Los Angeles 41,083 211,734 252,817
Riverside 175,977 13,988 189,965
San Diego 7,535 57,996 65,531
San Francisco 20,654 3,547 24,201
Santa Barbara 148,848 34,794 183,642
Santa Cruz 165,432 37,746 203,178
LBL 0 6,912 6,912
LLL 0 1,995 1,995
Los Alamos n/a 6,701 6,701
Other - UC 1,146 46,274 47,420
Stanford 6,825
Other-Network UC n/a 79,503 79,503
_______ ______ _____
969,475 686,430 1,662,730
Number of Records Displayed by database:
MAGS database 1,551,139
NEWS database 106,809
COMP database 45,667
Total number of Records Displayed 1,662,730
1.4 Relative Use of Databases
______________________________
Relative use of MAGS, NEWS, & COMP databases:
Percent of MAGS sessions 86.5%
Percent of NEWS sessions 10.8%
Percent of COMP sessions 2.7%
Percent of searches done in the MAGS database 88.8%
Percent of searches done in the NEWS database 9.0%
Percent of searches done in the COMP database 2.2%
1.5 Response time
__________________
Search response time from receipt of command at
DLA until transmission of response:
Average in seconds 0.8
Standard deviation in seconds 3.8
Display response time from receipt of command at
DLA until transmission of a complete screen:
Average in seconds 0.2
Standard deviation in seconds 3.8
2.0 Magazines & Journals Database Statistics
_____________________________________________
Median session length (minutes:seconds) 8:31
Average session length (minutes:seconds) 13:49
Longest session recorded (minutes:seconds) 869:48
Average number of searches completed per session 3.6
Retrievals per search - median 5.0
Retrievals per search - average 532.6
Retrievals per search - standard deviation 6961.4
Percent of searches completed with 0 results 32.6%
Percent of searches entered that are long 1.7%
Percent of long searches completed
(includes partial results) 52.3%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 134,108 27.5%
DISPLAY (excluding automatic displays) 210,844 43.2%
HELP 15,642 3.2%
EXPLAIN 10,884 2.2%
SET/RESET 11,435 2.3%
SHOW 2,736 0.6%
ADD ON (AND, OR, AND NOT) 8,509 1.7%
LOGON or LOGOFF 58,022 11.9%
COMMENT 19 0.0%
SAVE 8,076 1.7%
USE 170 0.0%
OTHER 27,131 5.6%
FINDs completed: RETRIEVALS PER NON-
TOTAL ZERO RESULTS ZERO RESULT SEARCHES
_____________ ______________ ______________________
% of % of
all all for Std.
No. FINDs No. Index Median Avg. Dev.
______ ______ ______ _______ ______ _______ _______
By index:
PERSONAL AUTHOR 16,567 11.9% 5,012 30.3% 10 72.4 279.9
TITLE WORD 22,259 16.0% 7,160 32.2% 14 424.2 6613.4
EXACT TITLE 3,407 2.5% 1,632 47.9% 3 79.7 419.3
JOURNAL 5,878 4.2% 3,084 52.5% 756 5230.7 13176.7
EXACT JOURNAL 3,255 2.3% 1,411 43.3% 573 4907.5 13388.3
SUBJECT 34,917 25.2% 15,392 44.1% 40 379.6 5131.9
EXACT SUBJECT 2,052 1.5% 932 45.4% 38 421.8 1761.8
KEYWORD 44,231 31.9% 9,337 21.1% 27 960.8 11593.6
SUBFILE 56 0.0% 12 21.4% 39 205.0 388.4
PUBLICATION TYPE 437 0.3% 157 35.9% 12 179.8 1091.1
DATE 1,180 0.9% 274 23.2% 26 174.4 689.4
ADDED 7 0.0% 2 28.6% 40,566 26874.0 18748.5
PERIODICAL 2,298 1.7% 537 23.4% 12 350.5 1856.4
EXACT PE 1,105 0.8% 212 19.2% 6 50.7 209.7
RPE 5 0.0% 4 80.0% 1 1.0 0.0
XRP 0 0.0% 0 0.0% 0 0.0 0.0
COMMENTS 13 0.0% 8 61.5% 4,066 2808.2 1823.4
Other indexes 1,017 0.7% 232 22.8% 153 1730.3 4832.1
RETRIEVALS PER NON-
TOTAL ZERO RESULTS ZERO RESULT SEARCHES
_____________ ______________ ______________________
% of % of
all all for Std.
No. FINDs No. Index Median Avg. Dev.
______ ______ ______ _______ ______ _______ _______
By number of indexes:
Multiple 5,615 4.2% 1,962 34.9% 11 328.5 2117.6
Single 127,228 95.8% 41,374 32.5% 24 843.7 8887.7
DISPLAY commands, by type, excluding automatic displays:
REVIEW 1.7%
SHORT 66.7%
LONG 1.4%
FIELDS 0.6%
PERIODICALS 1.2%
COMMENTS 0.0%
Other 28.4%
2.1 Computer Articles Database Statistics
__________________________________________
Median session length (minutes:seconds) 6:21
Average session length (minutes:seconds) 11:55
Longest session recorded (minutes:seconds) 381:45
Average number of searches completed per session 2.9
Retrievals per search - median 6.0
Retrievals per search - average 990.3
Retrievals per search - standard deviation 8252.1
Percent of searches completed with 0 results 32.6%
Percent of searches entered that are long 3.1%
Percent of long searches completed
(includes partial results) 38.0%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 3,158 26.5%
DISPLAY (excluding automatic displays) 4,834 40.6%
HELP 346 2.9%
EXPLAIN 309 2.6%
SET/RESET 474 4.0%
SHOW 56 0.5%
ADD ON (AND, OR, AND NOT) 375 3.1%
LOGON or LOGOFF 1,619 13.6%
COMMENT 0 0.0%
SAVE 112 0.9%
USE 5 0.0%
OTHER 632 5.3%
FINDs completed: RETRIEVALS PER NON-
TOTAL ZERO RESULTS ZERO RESULT SEARCHES
_____________ ______________ ______________________
% of % of
all all for Std.
No. FINDs No. Index Median Avg. Dev.
______ ______ ______ _______ ______ _______ _______
By index:
PERSONAL AUTHOR 267 8.1% 156 58.4% 4 71.3 195.1
TITLE WORD 806 24.4% 251 31.1% 17 466.8 2299.6
EXACT TITLE 43 1.3% 24 55.8% 4 22.8 58.2
JOURNAL 82 2.5% 48 58.5% 7,573 9374.8 11725.6
EXACT JOURNAL 66 2.0% 36 54.5% 2,962 8248.0 18606.6
SUBJECT 697 21.1% 282 40.5% 76 1021.1 3560.2
EXACT SUBJECT 46 1.4% 26 56.5% 113 1537.6 3301.5
KEYWORD 1,089 32.9% 233 21.4% 49 2280.2 15419.5
SUBFILE 0 0.0% 0 0.0% 0 0.0 0.0
PUBLICATION TYPE 35 1.1% 6 17.1% 32 391.2 1313.9
DATE 96 2.9% 28 29.2% 30 178.2 413.8
ADDED 1 0.0% 0 0.0% 8 8.0 0.0
PERIODICAL 45 1.4% 7 15.6% 9 2377.2 7633.2
EXACT PE 9 0.3% 7 77.8% 10 9.5 10.6
RPE 0 0.0% 0 0.0% 0 0.0 0.0
XRP 0 0.0% 0 0.0% 0 0.0 0.0
COMMENTS 0 0.0% 0 0.0% 0 0.0 0.0
Other indexes 26 0.8% 6 23.1% 85 1203.0 2587.7
By number of indexes:
Multiple 189 6.1% 61 32.3% 27 333.9 886.1
Single 2,909 93.9% 985 33.9% 35 1710.7 11009.1
DISPLAY commands, by type, excluding automatic displays:
REVIEW 3.0%
SHORT 64.8%
LONG 1.4%
FIELDS 1.5%
PERIODICALS 0.8%
COMMENTS 0.0%
Other 28.5%
2.1.1 Article Text
___________________
DISPLAY TEXT commands 33,747
TEXT included with CONTINUOUS, PRINT, CAPTURE, or SLOW 2,005
displays or when any of these paging options is set.
TEXT included with MAIL commands 7,351
SET DISPLAY TEXT commands 10
2.2 Newspaper Articles Database Statistics
___________________________________________
Median session length (minutes:seconds) 5:45
Average session length (minutes:seconds) 10:32
Longest session recorded (minutes:seconds) 229:32
Average number of searches completed per session 2.9
Retrievals per search - median 3.0
Retrievals per search - average 917.4
Retrievals per search - standard deviation 18028
Percent of searches completed with 0 results 38.8%
Percent of searches entered that are long 2.0%
Percent of long searches completed
(includes partial results) 53.6%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 13,809 36.3%
DISPLAY (excluding automatic displays) 9,734 25.6%
HELP 1,643 4.3%
EXPLAIN 1,084 2.9%
SET/RESET 1,838 4.8%
SHOW 204 0.5%
ADD ON (AND, OR, AND NOT) 717 1.9%
LOGON or LOGOFF 6,529 17.2%
COMMENT 0 0.0%
SAVE 588 1.5%
USE 18 0.0%
OTHER 1,842 4.8%
FINDs completed: RETRIEVALS PER NON-
TOTAL ZERO RESULTS ZERO RESULT SEARCHES
_____________ ______________ ______________________
% of % of
all all for Std.
No. FINDs No. Index Median Avg. Dev.
______ ______ ______ _______ ______ _______ _______
By index:
PERSONAL AUTHOR 550 3.8% 302 54.9% 14 262.9 513.5
TITLE WORD 2,423 16.8% 758 31.3% 19 616.1 3877.6
EXACT TITLE 237 1.6% 144 60.8% 2 46.5 101.8
JOURNAL 200 1.4% 113 56.5% 53 75559.4 215699
EXACT JOURNAL 143 1.0% 89 62.2% 118 3312.2 17010.5
SUBJECT 4,678 32.5% 2,229 47.6% 38 691.4 2684.7
EXACT SUBJECT 475 3.3% 239 50.3% 78 838.3 1692.4
KEYWORD 5,174 35.9% 1,547 29.9% 22 901.2 5244.6
SUBFILE 0 0.0% 0 0.0% 0 0.0 0.0
PUBLICATION TYPE 16 0.1% 9 56.3% 3 6.6 7.3
DATE 401 2.8% 101 25.2% 12 134.3 520.2
ADDED 0 0.0% 0 0.0% 0 0.0 0.0
PERIODICAL 60 0.4% 16 26.7% 23 553.1 2623.6
EXACT PE 33 0.2% 10 30.3% 13 22.6 27.9
RPE 0 0.0% 0 0.0% 0 0.0 0.0
XRP 0 0.0% 0 0.0% 0 0.0 0.0
COMMENTS 1 0.0% 1 100% 0 0.0 0.0
Other indexes 21 0.1% 13 61.9% 39 709.3 1895.1
RETRIEVALS PER NON-
TOTAL ZERO RESULTS ZERO RESULT SEARCHES
_____________ ______________ ______________________
% of % of
all all for Std.
No. FINDs No. Index Median Avg. Dev.
______ ______ ______ _______ ______ _______ _______
By number of indexes:
Multiple 735 5.4% 239 32.5% 13 231.3 983.2
Single 12,903 94.6% 5,078 39.4% 27 1641.8 24353.2
DISPLAY commands, by type, excluding automatic displays:
REVIEW 2.2%
SHORT 50.9%
LONG 1.8%
FIELDS 0.6%
PERIODICALS 0.4%
COMMENTS 0.0%
Other 44.1%
2.3 Error, EXPLAIN and HELP statistics (MAGS, COMP, & NEWS)
_______________________________________ ____________________
Percent of commands that contained errors 14.2%
Ten most frequent errors:
1. First word of command is invalid 38.1%
2. NS command - no next screen 24.0%
3. FIND command with invalid index name 10.0%
4. PS command - no previous screen 5.1%
5. DISPLAY command contains invalid word 3.8%
6. Valid command at an inappropriate time 2.9%
7. Search term missing from search command 1.9%
8. DISPLAY command-record numbers too large 1.0%
9. MAIL command issued w/o email address 1.0%
10. Add-on search, no index name after verb 1.0%
11. All others 11.2%
Ten most frequent EXPLAIN requests:
1. GUIDE 21.1%
2. LOCATE (ARTICLE DBS) 20.3%
3. FIND 8.4%
4. COMMANDS 7.8%
5. INDEXES 6.1%
6. Unrecognized term 5.3%
7. MAGS DATABASE 4.0%
8. ADDON SEARCH 3.5%
9. DISPLAYS (IAC DBS) 3.5%
10. ABI TEXT 2.1%
11. All others 17.8%
Ten most frequent HELP situations:
1. Help requested from SET DB command 20.2%
2. First word of command is invalid 19.2%
3. FIND command with invalid index name 9.4%
4. FIND command with zero results 7.1%
5. DISPLAY command - middle of >1 screen 5.5%
6. DISPLAY command-first of >1 screen 5.4%
7. DISPLAY command-complete in one screen 5.1%
8. FIND command retrieves >1 book 3.8%
9. NS command - no next screen 3.4%
10. PS command - no previous screen 2.5%
11. All others 18.3%
Ten most frequent SHOW requests:
1. SEARCH 38.6%
2. HISTORY 28.1%
3. MAIL STATUS 13.5%
4. MAIL SETTINGS 4.6%
5. IAC NEWS 2.9%
6. GLOSSARY 2.9%
7. SETTINGS (IAC DBS) 2.8%
8. SYSTEM NEWS 2.5%
9. DISPLAY 1.1%
10. LIBRARY NEWS 0.7%
11. All others 2.3%