MELVYL IAC DATABASES TELNET STATISTICS
Time period: 01/01/99 through 01/31/99
1.0 SUMMARY STATISTICS
_______________________
1.1 Total sessions:
____________________
Location Library Remote Total
________ _______ ______ _____
Berkeley 1,251 2,953 4,204
Davis 3,344 156 3,500
Irvine 5,896 0 5,896
Los Angeles 526 2,592 3,118
Riverside 2,195 264 2,459
San Diego 227 1,271 1,498
San Francisco 578 17 595
Santa Barbara 2,461 836 3,297
Santa Cruz 3,388 928 4,316
LBL 0 144 144
LLL 0 49 49
Los Alamos n/a 17 17
Other - UC 34 286 320
Stanford 879
Other-Network UC n/a 1,684 1,684
_______ ______ _____
19,900 11,197 31,976
Per hour usage:
Time Sessions Finds Records Displayed
__________ __________ __________ _________________
12-2 a.m. 369 1,667 21,391
2-4 a.m. 145 575 8,186
4-6 a.m. 98 336 8,032
6-8 a.m. 281 759 7,748
8-10 a.m. 2,155 6,875 65,210
10-12 a.m. 4,820 15,609 153,467
12-2 p.m. 6,132 20,242 203,370
2-4 p.m. 7,304 24,473 261,947
4-6 p.m. 4,933 17,572 201,350
6-8 p.m. 2,594 9,340 100,720
8-10 p.m. 1,981 7,306 77,138
10-12 p.m. 1,164 4,503 63,536
__________ __________ __________ _________________
Total: 31,976 109,257 1,172,095
1.2 FIND commands
__________________
Number of FIND commands issued by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 4,142 8,723 12,865
Davis 10,104 652 10,756
Irvine 19,315 0 19,315
Los Angeles 1,470 9,704 11,174
Riverside 7,727 1,003 8,730
San Diego 585 4,166 4,751
San Francisco 1,707 45 1,752
Santa Barbara 9,070 2,554 11,624
Santa Cruz 14,115 3,081 17,196
LBL 0 469 469
LLL 0 121 121
Los Alamos n/a 43 43
Other - UC 81 1,080 1,161
Stanford 3,598
Other-Network UC n/a 5,702 5,702
_______ ______ _____
68,316 37,343 109,257
Number of FIND commands by database
MAGS database 97,065
NEWS database 8,934
COMP database 3,258
Total number of FIND commands 109,257
1.3 Records displayed
______________________
Number of Records Displayed by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 51,481 107,656 159,137
Davis 89,163 6,113 95,276
Irvine 175,754 0 175,754
Los Angeles 17,233 125,238 142,471
Riverside 65,466 12,798 78,264
San Diego 4,174 47,964 52,138
San Francisco 19,908 326 20,234
Santa Barbara 93,596 39,318 132,914
Santa Cruz 120,037 27,415 147,452
LBL 0 4,523 4,523
LLL 0 1,468 1,468
Los Alamos n/a 387 387
Other - UC 544 14,371 14,915
Stanford 6,135
Other-Network UC n/a 100,097 100,097
_______ ______ _____
637,356 487,674 1,131,165
Number of Records Displayed by database:
MAGS database 1,054,562
NEWS database 68,712
COMP database 48,821
Total number of Records Displayed 1,131,165
1.4 Relative Use of Databases
______________________________
Relative use of MAGS, NEWS, & COMP databases:
Percent of MAGS sessions 86.3%
Percent of NEWS sessions 10.3%
Percent of COMP sessions 3.5%
Percent of searches done in the MAGS database 88.8%
Percent of searches done in the NEWS database 8.2%
Percent of searches done in the COMP database 3.0%
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 3.2
Display response time from receipt of command at
DLA until transmission of a complete screen:
Average in seconds 0.2
Standard deviation in seconds 3.2
2.0 Magazines & Journals Database Statistics
_____________________________________________
Median session length (minutes:seconds) 8:16
Average session length (minutes:seconds) 13:48
Longest session recorded (minutes:seconds) 520:36
Average number of searches completed per session 3.5
Retrievals per search - median 5.0
Retrievals per search - average 549.7
Retrievals per search - standard deviation 6330.1
Percent of searches completed with 0 results 32.1%
Percent of searches entered that are long 1.7%
Percent of long searches completed
(includes partial results) 50.9%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 90,674 27.7%
DISPLAY (excluding automatic displays) 137,295 41.9%
HELP 10,394 3.2%
EXPLAIN 7,019 2.1%
SET/RESET 8,879 2.7%
SHOW 1,668 0.5%
ADD ON (AND, OR, AND NOT) 6,391 2.0%
LOGON or LOGOFF 39,207 12.0%
COMMENT 13 0.0%
SAVE 6,160 1.9%
USE 133 0.0%
OTHER 19,787 6.0%
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 13,964 14.8% 4,180 29.9% 9 61.3 231.4
TITLE WORD 15,414 16.3% 4,986 32.3% 14 403.4 2778.1
EXACT TITLE 2,396 2.5% 1,201 50.1% 3 95.9 471.4
JOURNAL 4,091 4.3% 2,145 52.4% 710 5490.7 14348.9
EXACT JOURNAL 2,609 2.8% 1,161 44.5% 694 4501.4 13264.0
SUBJECT 21,433 22.7% 9,336 43.6% 50 404.1 1609.7
EXACT SUBJECT 1,314 1.4% 610 46.4% 31 292.6 836.7
KEYWORD 28,227 29.9% 5,770 20.4% 31 994.3 10465.6
SUBFILE 199 0.2% 63 31.7% 25 209.0 853.8
PUBLICATION TYPE 278 0.3% 65 23.4% 12 85.4 275.9
DATE 1,026 1.1% 187 18.2% 40 205.5 1046.3
ADDED 9 0.0% 1 11.1% 5,339 12148.9 14292.9
PERIODICAL 1,851 2.0% 400 21.6% 11 341.3 2068.3
EXACT PE 903 1.0% 173 19.2% 4 85.1 880.7
RPE 2 0.0% 1 50.0% 550 550.0 0.0
XRP 0 0.0% 0 0.0% 0 0.0 0.0
COMMENTS 3 0.0% 0 0.0% 4,065 4065.0 0.0
Other indexes 571 0.6% 143 25.0% 118 2018.4 5176.9
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 4,300 4.8% 1,419 33.0% 15 404.1 2217.2
Single 85,469 95.2% 27,528 32.2% 23 845.0 7541.1
DISPLAY commands, by type, excluding automatic displays:
REVIEW 1.9%
SHORT 65.1%
LONG 1.6%
FIELDS 0.7%
PERIODICALS 1.6%
COMMENTS 0.0%
Other 29.0%
2.1 Computer Articles Database Statistics
__________________________________________
Median session length (minutes:seconds) 6:31
Average session length (minutes:seconds) 11:53
Longest session recorded (minutes:seconds) 410:00
Average number of searches completed per session 2.9
Retrievals per search - median 8.0
Retrievals per search - average 979.9
Retrievals per search - standard deviation 8296.2
Percent of searches completed with 0 results 28.7%
Percent of searches entered that are long 2.6%
Percent of long searches completed
(includes partial results) 63.5%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 2,867 24.6%
DISPLAY (excluding automatic displays) 4,860 41.6%
HELP 327 2.8%
EXPLAIN 323 2.8%
SET/RESET 435 3.7%
SHOW 69 0.6%
ADD ON (AND, OR, AND NOT) 391 3.4%
LOGON or LOGOFF 1,509 12.9%
COMMENT 0 0.0%
SAVE 296 2.5%
USE 3 0.0%
OTHER 590 5.1%
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 307 9.7% 180 58.6% 7 90.3 186.4
TITLE WORD 621 19.6% 198 31.9% 33 558.4 2105.5
EXACT TITLE 69 2.2% 28 40.6% 4 18.3 23.4
JOURNAL 103 3.3% 60 58.3% 1,847 14662.3 42853.8
EXACT JOURNAL 116 3.7% 24 20.7% 103 2739.5 7268.8
SUBJECT 492 15.5% 183 37.2% 65 800.8 2366.7
EXACT SUBJECT 53 1.7% 18 34.0% 60 825.4 2781.2
KEYWORD 1,111 35.1% 182 16.4% 45 1648.3 11337.5
SUBFILE 0 0.0% 0 0.0% 0 0.0 0.0
PUBLICATION TYPE 53 1.7% 13 24.5% 36 367.6 1027.6
DATE 148 4.7% 32 21.6% 28 170.9 372.8
ADDED 7 0.2% 4 57.1% 105 184.0 149.1
PERIODICAL 31 1.0% 7 22.6% 5 1408.8 5714.1
EXACT PE 16 0.5% 2 12.5% 6 1237.2 4428.4
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% 0 0.0% 4,066 4066.0 0.0
Other indexes 38 1.2% 11 28.9% 20 670.4 1400.2
By number of indexes:
Multiple 302 10.6% 86 28.5% 28 250.5 842.4
Single 2,536 89.4% 764 30.1% 47 1646.6 10987.2
DISPLAY commands, by type, excluding automatic displays:
REVIEW 5.6%
SHORT 61.0%
LONG 1.4%
FIELDS 1.9%
PERIODICALS 1.0%
COMMENTS 0.0%
Other 29.1%
2.1.1 Article Text
___________________
DISPLAY TEXT commands 22,371
TEXT included with CONTINUOUS, PRINT, CAPTURE, or SLOW 1,522
displays or when any of these paging options is set.
TEXT included with MAIL commands 5,150
SET DISPLAY TEXT commands 11
2.2 Newspaper Articles Database Statistics
___________________________________________
Median session length (minutes:seconds) 6:05
Average session length (minutes:seconds) 11:48
Longest session recorded (minutes:seconds) 777:07
Average number of searches completed per session 2.7
Retrievals per search - median 4.0
Retrievals per search - average 3076.6
Retrievals per search - standard deviation 44140
Percent of searches completed with 0 results 36.9%
Percent of searches entered that are long 1.6%
Percent of long searches completed
(includes partial results) 55.8%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 8,314 34.1%
DISPLAY (excluding automatic displays) 6,171 25.3%
HELP 1,016 4.2%
EXPLAIN 716 2.9%
SET/RESET 1,344 5.5%
SHOW 172 0.7%
ADD ON (AND, OR, AND NOT) 620 2.5%
LOGON or LOGOFF 4,174 17.1%
COMMENT 3 0.0%
SAVE 604 2.5%
USE 23 0.1%
OTHER 1,257 5.1%
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 411 4.7% 237 57.7% 24 362.3 746.6
TITLE WORD 1,535 17.6% 467 30.4% 21 483.1 2748.7
EXACT TITLE 204 2.3% 114 55.9% 10 138.6 285.9
JOURNAL 117 1.3% 48 41.0% 2,429 306923 372901
EXACT JOURNAL 46 0.5% 20 43.5% 63 809.8 2058.1
SUBJECT 2,645 30.3% 1,212 45.8% 46 700.2 2944.0
EXACT SUBJECT 142 1.6% 82 57.7% 163 1150.8 1810.6
KEYWORD 3,183 36.5% 897 28.2% 30 1859.2 24014.1
SUBFILE 0 0.0% 0 0.0% 0 0.0 0.0
PUBLICATION TYPE 30 0.3% 9 30.0% 20 642.9 1962.8
DATE 284 3.3% 87 30.6% 14 69.5 197.3
ADDED 7 0.1% 1 14.3% 15 139.2 245.4
PERIODICAL 69 0.8% 17 24.6% 7 107.2 466.1
EXACT PE 20 0.2% 7 35.0% 69 92.2 139.5
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 0.3% 13 43.3% 57 274.1 320.7
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 463 5.6% 137 29.6% 14 325.2 1861.6
Single 7,772 94.4% 2,933 37.7% 34 5567.2 59540.5
DISPLAY commands, by type, excluding automatic displays:
REVIEW 2.7%
SHORT 50.4%
LONG 2.1%
FIELDS 0.9%
PERIODICALS 0.9%
COMMENTS 0.0%
Other 43.1%
2.3 Error, EXPLAIN and HELP statistics (MAGS, COMP, & NEWS)
_______________________________________ ____________________
Percent of commands that contained errors 13.9%
Ten most frequent errors:
1. First word of command is invalid 37.2%
2. NS command - no next screen 24.1%
3. FIND command with invalid index name 10.8%
4. PS command - no previous screen 4.5%
5. DISPLAY command contains invalid word 3.7%
6. Valid command at an inappropriate time 2.3%
7. Search term missing from search command 2.2%
8. MAIL command issued w/o email address 1.5%
9. DISPLAY command-record numbers too large 1.0%
10. Add-on search, no index name after verb 0.9%
11. All others 11.8%
Ten most frequent EXPLAIN requests:
1. GUIDE 23.2%
2. LOCATE (ARTICLE DBS) 13.6%
3. FIND 8.6%
4. COMMANDS 8.1%
5. INDEXES 7.6%
6. Unrecognized term 4.8%
7. MAGS DATABASE 4.1%
8. DISPLAYS (IAC DBS) 3.9%
9. ADDON SEARCH 3.6%
10. MAIL 2.9%
11. All others 19.5%
Ten most frequent HELP situations:
1. Help requested from SET DB command 21.8%
2. First word of command is invalid 19.4%
3. FIND command with invalid index name 10.0%
4. FIND command with zero results 6.7%
5. DISPLAY command - middle of >1 screen 5.4%
6. DISPLAY command-first of >1 screen 4.8%
7. FIND command retrieves >1 book 3.8%
8. DISPLAY command-complete in one screen 3.8%
9. NS command - no next screen 3.3%
10. PS command - no previous screen 2.2%
11. All others 18.9%
Ten most frequent SHOW requests:
1. SEARCH 39.0%
2. HISTORY 29.7%
3. MAIL STATUS 9.4%
4. MAIL SETTINGS 4.9%
5. IAC NEWS 3.8%
6. DLA NEWS 3.3%
7. GLOSSARY 2.9%
8. SETTINGS (IAC DBS) 2.8%
9. DISPLAY 1.0%
10. LIBRARY NEWS 0.7%
11. All others 2.6%