MELVYL IAC DATABASES TELNET STATISTICS
Time period: 04/01/99 through 04/30/99
1.0 SUMMARY STATISTICS
_______________________
1.1 Total sessions:
____________________
Location Library Remote Total
________ _______ ______ _____
Berkeley 4,279 5,329 9,608
Davis 2,973 140 3,113
Irvine 5,052 0 5,052
Los Angeles 592 2,963 3,555
Riverside 2,603 318 2,921
San Diego 287 1,003 1,290
San Francisco 602 22 624
Santa Barbara 2,548 559 3,107
Santa Cruz 3,268 857 4,125
LBL 0 157 157
LLL 0 35 35
Los Alamos n/a 6 6
Other - UC 36 1,097 1,133
Stanford 827
Other-Network UC n/a 1,303 1,303
_______ ______ _____
22,240 13,789 36,856
Per hour usage:
Time Sessions Finds Records Displayed
__________ __________ __________ _________________
12-2 a.m. 456 2,058 27,936
2-4 a.m. 139 552 9,957
4-6 a.m. 100 390 5,825
6-8 a.m. 292 897 15,061
8-10 a.m. 2,370 7,358 70,084
10-12 a.m. 5,491 17,477 184,740
12-2 p.m. 7,153 23,890 249,861
2-4 p.m. 7,985 26,411 278,612
4-6 p.m. 5,702 19,802 223,134
6-8 p.m. 3,158 11,488 126,651
8-10 p.m. 2,658 10,100 113,243
10-12 p.m. 1,354 5,128 62,763
__________ __________ __________ _________________
Total: 36,858 125,551 1,367,867
1.2 FIND commands
__________________
Number of FIND commands issued by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 15,397 17,265 32,662
Davis 8,545 451 8,996
Irvine 18,144 0 18,144
Los Angeles 2,100 9,946 12,046
Riverside 8,553 986 9,539
San Diego 783 2,881 3,664
San Francisco 2,030 55 2,085
Santa Barbara 8,637 1,705 10,342
Santa Cruz 12,604 3,249 15,853
LBL 0 528 528
LLL 0 111 111
Los Alamos n/a 28 28
Other - UC 92 3,974 4,066
Stanford 3,094
Other-Network UC n/a 4,391 4,391
_______ ______ _____
76,885 45,570 125,549
Number of FIND commands by database
MAGS database 111,952
NEWS database 10,721
COMP database 2,878
Total number of FIND commands 125,549
1.3 Records displayed
______________________
Number of Records Displayed by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 164,851 225,488 390,339
Davis 80,215 5,226 85,441
Irvine 157,365 0 157,365
Los Angeles 25,693 139,389 165,082
Riverside 77,143 8,657 85,800
San Diego 6,463 27,679 34,142
San Francisco 21,933 1,103 23,036
Santa Barbara 86,261 17,910 104,171
Santa Cruz 116,332 33,134 149,466
LBL 0 7,449 7,449
LLL 0 837 837
Los Alamos n/a 344 344
Other - UC 656 59,441 60,097
Stanford 6,041
Other-Network UC n/a 60,514 60,514
_______ ______ _____
736,912 587,171 1,330,124
Number of Records Displayed by database:
MAGS database 1,246,084
NEWS database 91,133
COMP database 30,650
Total number of Records Displayed 1,330,124
1.4 Relative Use of Databases
______________________________
Relative use of MAGS, NEWS, & COMP databases:
Percent of MAGS sessions 86.5%
Percent of NEWS sessions 10.7%
Percent of COMP sessions 2.8%
Percent of searches done in the MAGS database 89.2%
Percent of searches done in the NEWS database 8.5%
Percent of searches done in the COMP database 2.3%
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 4.4
Display response time from receipt of command at
DLA until transmission of a complete screen:
Average in seconds 0.2
Standard deviation in seconds 4.4
2.0 Magazines & Journals Database Statistics
_____________________________________________
Median session length (minutes:seconds) 8:00
Average session length (minutes:seconds) 13:15
Longest session recorded (minutes:seconds) 363:47
Average number of searches completed per session 3.5
Retrievals per search - median 5.0
Retrievals per search - average 599.6
Retrievals per search - standard deviation 7074.9
Percent of searches completed with 0 results 31.8%
Percent of searches entered that are long 1.6%
Percent of long searches completed
(includes partial results) 51.6%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 105,300 27.2%
DISPLAY (excluding automatic displays) 163,700 42.3%
HELP 13,485 3.5%
EXPLAIN 9,143 2.4%
SET/RESET 8,950 2.3%
SHOW 2,067 0.5%
ADD ON (AND, OR, AND NOT) 6,652 1.7%
LOGON or LOGOFF 47,332 12.2%
COMMENT 10 0.0%
SAVE 7,728 2.0%
USE 119 0.0%
OTHER 22,227 5.7%
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 13,592 12.5% 4,172 30.7% 10 65.7 234.6
TITLE WORD 18,577 17.1% 5,688 30.6% 12 461.3 6492.4
EXACT TITLE 2,586 2.4% 1,240 47.9% 2 95.9 473.7
JOURNAL 4,428 4.1% 2,296 51.9% 876 5627.3 13863.0
EXACT JOURNAL 2,657 2.4% 1,145 43.1% 579 5045.1 13194.9
SUBJECT 28,099 25.8% 11,956 42.5% 45 468.3 5774.6
EXACT SUBJECT 1,298 1.2% 608 46.8% 52 446.7 1350.7
KEYWORD 32,631 30.0% 6,722 20.6% 29 1137.7 11789.7
SUBFILE 214 0.2% 27 12.6% 92 794.5 2080.1
PUBLICATION TYPE 381 0.4% 94 24.7% 12 467.9 2027.7
DATE 960 0.9% 208 21.7% 23 186.0 597.6
ADDED 10 0.0% 3 30.0% 42,390 41205.0 11585.6
PERIODICAL 1,787 1.6% 349 19.5% 11 464.5 3819.8
EXACT PE 931 0.9% 209 22.4% 5 36.1 150.6
RPE 3 0.0% 3 100% 0 0.0 0.0
XRP 0 0.0% 0 0.0% 0 0.0 0.0
COMMENTS 6 0.0% 5 83.3% 4,066 4066.0 0.0
Other indexes 661 0.6% 146 22.1% 145 1877.8 5758.3
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 4,387 4.2% 1,460 33.3% 13 432.8 2542.3
Single 99,877 95.8% 31,901 31.9% 24 934.1 8962.7
DISPLAY commands, by type, excluding automatic displays:
REVIEW 1.5%
SHORT 66.5%
LONG 1.6%
FIELDS 0.6%
PERIODICALS 1.4%
COMMENTS 0.0%
Other 28.5%
2.1 Computer Articles Database Statistics
__________________________________________
Median session length (minutes:seconds) 6:36
Average session length (minutes:seconds) 10:49
Longest session recorded (minutes:seconds) 342:59
Average number of searches completed per session 2.7
Retrievals per search - median 11.0
Retrievals per search - average 950.3
Retrievals per search - standard deviation 6104.4
Percent of searches completed with 0 results 27.8%
Percent of searches entered that are long 2.3%
Percent of long searches completed
(includes partial results) 55.4%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 2,447 24.8%
DISPLAY (excluding automatic displays) 3,826 38.8%
HELP 280 2.8%
EXPLAIN 289 2.9%
SET/RESET 415 4.2%
SHOW 51 0.5%
ADD ON (AND, OR, AND NOT) 431 4.4%
LOGON or LOGOFF 1,395 14.2%
COMMENT 0 0.0%
SAVE 165 1.7%
USE 3 0.0%
OTHER 556 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 228 8.9% 130 57.0% 7 115.0 239.5
TITLE WORD 616 24.0% 196 31.8% 26 587.5 3917.8
EXACT TITLE 35 1.4% 26 74.3% 8 41.7 56.9
JOURNAL 95 3.7% 59 62.1% 1,144 3643.7 8285.5
EXACT JOURNAL 40 1.6% 11 27.5% 1,678 11005.0 23079.9
SUBJECT 489 19.1% 174 35.6% 73 600.5 1624.5
EXACT SUBJECT 33 1.3% 12 36.4% 34 291.4 408.1
KEYWORD 886 34.5% 131 14.8% 52 2150.5 9762.3
SUBFILE 0 0.0% 0 0.0% 0 0.0 0.0
PUBLICATION TYPE 9 0.4% 1 11.1% 45 156.8 266.8
DATE 66 2.6% 12 18.2% 36 158.1 362.4
ADDED 0 0.0% 0 0.0% 0 0.0 0.0
PERIODICAL 33 1.3% 4 12.1% 8 293.7 685.2
EXACT PE 5 0.2% 0 0.0% 3 3.8 3.1
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 30 1.2% 4 13.3% 79 854.5 2445.4
By number of indexes:
Multiple 138 5.7% 43 31.2% 48 344.5 1330.3
Single 2,277 94.3% 673 29.6% 47 1560.2 7903.1
DISPLAY commands, by type, excluding automatic displays:
REVIEW 4.7%
SHORT 61.4%
LONG 1.4%
FIELDS 1.9%
PERIODICALS 0.9%
COMMENTS 0.0%
Other 29.7%
2.1.1 Article Text
___________________
DISPLAY TEXT commands 26,372
TEXT included with CONTINUOUS, PRINT, CAPTURE, or SLOW 1,359
displays or when any of these paging options is set.
TEXT included with MAIL commands 5,838
SET DISPLAY TEXT commands 6
2.2 Newspaper Articles Database Statistics
___________________________________________
Median session length (minutes:seconds) 5:31
Average session length (minutes:seconds) 10:27
Longest session recorded (minutes:seconds) 267:00
Average number of searches completed per session 2.7
Retrievals per search - median 3.0
Retrievals per search - average 1645.3
Retrievals per search - standard deviation 30753
Percent of searches completed with 0 results 37.0%
Percent of searches entered that are long 1.8%
Percent of long searches completed
(includes partial results) 55.6%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 10,082 34.4%
DISPLAY (excluding automatic displays) 7,333 25.0%
HELP 1,361 4.6%
EXPLAIN 961 3.3%
SET/RESET 1,529 5.2%
SHOW 188 0.6%
ADD ON (AND, OR, AND NOT) 639 2.2%
LOGON or LOGOFF 5,245 17.9%
COMMENT 0 0.0%
SAVE 415 1.4%
USE 7 0.0%
OTHER 1,523 5.2%
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 580 5.5% 293 50.5% 20 330.5 696.2
TITLE WORD 1,927 18.2% 682 35.4% 14 446.8 3740.5
EXACT TITLE 183 1.7% 94 51.4% 2 157.9 492.1
JOURNAL 173 1.6% 101 58.4% 561 179279 327485
EXACT JOURNAL 113 1.1% 61 54.0% 9 262.8 1087.4
SUBJECT 3,324 31.3% 1,473 44.3% 50 566.2 2461.4
EXACT SUBJECT 127 1.2% 68 53.5% 51 357.8 752.9
KEYWORD 3,726 35.1% 1,001 26.9% 23 998.9 5673.7
SUBFILE 3 0.0% 3 100% 0 0.0 0.0
PUBLICATION TYPE 33 0.3% 15 45.5% 6 51.3 126.0
DATE 353 3.3% 79 22.4% 24 144.9 389.6
ADDED 0 0.0% 0 0.0% 0 0.0 0.0
PERIODICAL 39 0.4% 6 15.4% 9 957.6 4880.0
EXACT PE 10 0.1% 4 40.0% 32 42.5 33.1
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 22 0.2% 9 40.9% 33 152.8 353.4
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 589 5.9% 179 30.4% 20 174.2 556.1
Single 9,377 94.1% 3,515 37.5% 25 2952.6 41302.5
DISPLAY commands, by type, excluding automatic displays:
REVIEW 2.1%
SHORT 50.4%
LONG 2.7%
FIELDS 0.8%
PERIODICALS 0.3%
COMMENTS 0.0%
Other 43.6%
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 38.8%
2. NS command - no next screen 22.7%
3. FIND command with invalid index name 10.7%
4. PS command - no previous screen 5.2%
5. DISPLAY command contains invalid word 3.7%
6. Valid command at an inappropriate time 2.7%
7. Search term missing from search command 2.1%
8. MAIL command issued w/o email address 0.9%
9. DISPLAY command-record numbers too large 0.9%
10. Add-on search, no index name after verb 0.8%
11. All others 11.5%
Ten most frequent EXPLAIN requests:
1. LOCATE (ARTICLE DBS) 21.4%
2. GUIDE 21.2%
3. FIND 8.4%
4. COMMANDS 7.9%
5. INDEXES 6.1%
6. Unrecognized term 4.9%
7. MAGS DATABASE 3.9%
8. ADDON SEARCH 3.4%
9. DISPLAYS (IAC DBS) 3.2%
10. MAIL 2.6%
11. All others 17.1%
Ten most frequent HELP situations:
1. Help requested from SET DB command 20.5%
2. First word of command is invalid 19.4%
3. FIND command with invalid index name 9.7%
4. FIND command with zero results 7.4%
5. DISPLAY command-complete in one screen 5.7%
6. DISPLAY command - middle of >1 screen 5.5%
7. DISPLAY command-first of >1 screen 5.2%
8. FIND command retrieves >1 book 3.8%
9. NS command - no next screen 3.0%
10. PS command - no previous screen 2.3%
11. All others 17.6%
Ten most frequent SHOW requests:
1. SEARCH 36.5%
2. HISTORY 26.7%
3. MAIL STATUS 12.7%
4. MAIL SETTINGS 5.8%
5. IAC NEWS 4.2%
6. GLOSSARY 3.7%
7. SETTINGS (IAC DBS) 3.1%
8. SYSTEM NEWS 2.3%
9. DISPLAY 1.5%
10. LIBRARY NEWS 0.6%
11. All others 2.8%