MELVYL IAC DATABASES TELNET STATISTICS
Time period: 03/31/01 through 04/06/01
1.0 SUMMARY STATISTICS
_______________________
1.1 Total sessions:
____________________
Location Library Remote Total
________ _______ ______ _____
Berkeley 221 406 627
Davis 153 1 154
Irvine 98 0 98
Los Angeles 0 69 69
Riverside 27 27 54
San Diego 29 29 58
San Francisco 43 0 43
Santa Barbara 19 22 41
Santa Cruz 44 25 69
LBL 0 5 5
LLL 0 8 8
Los Alamos n/a 0 0
Other - UC 20 56 76
Stanford 29
Other-Network UC n/a 205 205
_______ ______ _____
654 853 1,536
Per hour usage:
Time Sessions Finds Records Displayed
__________ __________ __________ _________________
12-2 a.m. 30 80 2,668
2-4 a.m. 10 15 345
4-6 a.m. 6 20 347
6-8 a.m. 20 58 695
8-10 a.m. 98 329 2,538
10-12 a.m. 227 536 4,465
12-2 p.m. 286 827 11,005
2-4 p.m. 328 952 13,902
4-6 p.m. 243 707 11,225
6-8 p.m. 130 348 4,584
8-10 p.m. 106 253 3,769
10-12 p.m. 52 129 2,804
__________ __________ __________ _________________
Total: 1,536 4,254 58,347
1.2 FIND commands
__________________
Number of FIND commands issued by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 649 1,089 1,738
Davis 426 2 428
Irvine 214 0 214
Los Angeles 0 181 181
Riverside 104 81 185
San Diego 37 81 118
San Francisco 98 0 98
Santa Barbara 49 61 110
Santa Cruz 103 76 179
LBL 0 8 8
LLL 0 21 21
Los Alamos n/a 0 0
Other - UC 28 210 238
Stanford 82
Other-Network UC n/a 654 654
_______ ______ _____
1,708 2,464 4,254
Number of FIND commands by database
MAGS database 3,769
NEWS database 350
COMP database 135
Total number of FIND commands 4,254
1.3 Records displayed
______________________
Number of Records Displayed by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 6,989 18,993 25,982
Davis 3,637 2 3,639
Irvine 2,065 0 2,065
Los Angeles 0 2,950 2,950
Riverside 831 947 1,778
San Diego 293 1,187 1,480
San Francisco 1,399 0 1,399
Santa Barbara 159 457 616
Santa Cruz 1,169 905 2,074
LBL 0 53 53
LLL 0 525 525
Los Alamos n/a 0 0
Other - UC 263 3,248 3,511
Stanford 204
Other-Network UC n/a 11,466 11,466
_______ ______ _____
16,805 40,733 57,742
Number of Records Displayed by database:
MAGS database 53,624
NEWS database 2,964
COMP database 1,759
Total number of Records Displayed 57,742
1.4 Relative Use of Databases
______________________________
Relative use of MAGS, NEWS, & COMP databases:
Percent of MAGS sessions 86.4%
Percent of NEWS sessions 10.5%
Percent of COMP sessions 3.1%
Percent of searches done in the MAGS database 88.6%
Percent of searches done in the NEWS database 8.2%
Percent of searches done in the COMP database 3.2%
1.5 Response time
__________________
Search response time from receipt of command at
DLA until transmission of response:
Average in seconds 0.9
Standard deviation in seconds 4.8
Display response time from receipt of command at
DLA until transmission of a complete screen:
Average in seconds 0.1
Standard deviation in seconds 4.8
2.0 Magazines & Journals Database Statistics
_____________________________________________
Median session length (minutes:seconds) 6:27
Average session length (minutes:seconds) 11:22
Longest session recorded (minutes:seconds) 166:56
Average number of searches completed per session 2.8
Retrievals per search - median 6.0
Retrievals per search - average 692.2
Retrievals per search - standard deviation 12601
Percent of searches completed with 0 results 28.7%
Percent of searches entered that are long 1.5%
Percent of long searches completed
(includes partial results) 55.2%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 3,546 27.3%
DISPLAY (excluding automatic displays) 5,199 40.1%
HELP 396 3.1%
EXPLAIN 262 2.0%
SET/RESET 488 3.8%
SHOW 40 0.3%
ADD ON (AND, OR, AND NOT) 223 1.7%
LOGON or LOGOFF 1,777 13.7%
COMMENT 0 0.0%
SAVE 328 2.5%
USE 3 0.0%
OTHER 718 5.5%
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 682 18.8% 197 28.9% 12 66.6 219.5
TITLE WORD 832 22.9% 250 30.0% 13 427.0 2554.5
EXACT TITLE 84 2.3% 43 51.2% 3 285.3 1540.9
JOURNAL 156 4.3% 55 35.3% 1,252 12643.1 71936.4
EXACT JOURNAL 78 2.1% 32 41.0% 523 3673.0 8469.3
SUBJECT 749 20.6% 275 36.7% 27 250.6 751.0
EXACT SUBJECT 46 1.3% 13 28.3% 20 61.3 81.9
KEYWORD 849 23.4% 160 18.8% 33 1004.6 8701.3
SUBFILE 4 0.1% 1 25.0% 118 2492.7 4139.9
PUBLICATION TYPE 8 0.2% 1 12.5% 15 757.9 1953.2
DATE 26 0.7% 2 7.7% 35 345.0 903.8
ADDED 0 0.0% 0 0.0% 0 0.0 0.0
PERIODICAL 52 1.4% 9 17.3% 16 120.6 232.8
EXACT PE 32 0.9% 2 6.3% 2 7.4 12.0
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 32 0.9% 4 12.5% 1,092 2548.1 4310.1
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 117 3.3% 26 22.2% 40 1177.4 2850.8
Single 3,395 96.7% 992 29.2% 21 1013.3 15688.3
DISPLAY commands, by type, excluding automatic displays:
REVIEW 2.5%
SHORT 63.5%
LONG 1.4%
FIELDS 1.4%
PERIODICALS 1.4%
COMMENTS 0.0%
Other 29.7%
2.1 Computer Articles Database Statistics
__________________________________________
Median session length (minutes:seconds) 8:15
Average session length (minutes:seconds) 12:18
Longest session recorded (minutes:seconds) 50:02
Average number of searches completed per session 2.8
Retrievals per search - median 6.0
Retrievals per search - average 818.4
Retrievals per search - standard deviation 3730.8
Percent of searches completed with 0 results 30.4%
Percent of searches entered that are long 5.9%
Percent of long searches completed
(includes partial results) 100%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 116 28.3%
DISPLAY (excluding automatic displays) 151 36.8%
HELP 11 2.7%
EXPLAIN 8 2.0%
SET/RESET 21 5.1%
SHOW 1 0.2%
ADD ON (AND, OR, AND NOT) 19 4.6%
LOGON or LOGOFF 57 13.9%
COMMENT 0 0.0%
SAVE 11 2.7%
USE 0 0.0%
OTHER 15 3.7%
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 21 16.7% 9 42.9% 2 76.0 154.7
TITLE WORD 24 19.0% 3 12.5% 20 461.7 1497.9
EXACT TITLE 2 1.6% 1 50.0% 78 78.0 0.0
JOURNAL 3 2.4% 2 66.7% 36,523 36523.0 0.0
EXACT JOURNAL 5 4.0% 2 40.0% 1,603 5923.3 8767.0
SUBJECT 27 21.4% 12 44.4% 85 1507.0 2727.0
EXACT SUBJECT 0 0.0% 0 0.0% 0 0.0 0.0
KEYWORD 37 29.4% 10 27.0% 20 587.3 2063.9
SUBFILE 0 0.0% 0 0.0% 0 0.0 0.0
PUBLICATION TYPE 0 0.0% 0 0.0% 0 0.0 0.0
DATE 2 1.6% 0 0.0% 806 805.5 1127.8
ADDED 0 0.0% 0 0.0% 0 0.0 0.0
PERIODICAL 2 1.6% 0 0.0% 26 26.0 8.5
EXACT PE 2 1.6% 0 0.0% 2 2.0 1.4
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 0 0.0% 0 0.0% 0 0.0 0.0
Other indexes 1 0.8% 0 0.0% 82 82.0 0.0
By number of indexes:
Multiple 9 7.8% 1 11.1% 45 1092.9 2406.3
Single 107 92.2% 37 34.6% 32 1251.7 4954.2
DISPLAY commands, by type, excluding automatic displays:
REVIEW 3.8%
SHORT 54.4%
LONG 0.4%
FIELDS 5.4%
PERIODICALS 2.7%
COMMENTS 0.0%
Other 33.3%
2.1.1 Article Text
___________________
DISPLAY TEXT commands 1,121
TEXT included with CONTINUOUS, PRINT, CAPTURE, or SLOW 44
displays or when any of these paging options is set.
TEXT included with MAIL commands 194
SET DISPLAY TEXT commands 0
2.2 Newspaper Articles Database Statistics
___________________________________________
Median session length (minutes:seconds) 3:14
Average session length (minutes:seconds) 9:13
Longest session recorded (minutes:seconds) 107:37
Average number of searches completed per session 2.1
Retrievals per search - median 2.0
Retrievals per search - average 128.4
Retrievals per search - standard deviation 594.1
Percent of searches completed with 0 results 33.7%
Percent of searches entered that are long 0.9%
Percent of long searches completed
(includes partial results) 0.0%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 342 35.4%
DISPLAY (excluding automatic displays) 215 22.3%
HELP 49 5.1%
EXPLAIN 33 3.4%
SET/RESET 70 7.2%
SHOW 5 0.5%
ADD ON (AND, OR, AND NOT) 8 0.8%
LOGON or LOGOFF 200 20.7%
COMMENT 0 0.0%
SAVE 0 0.0%
USE 1 0.1%
OTHER 43 4.5%
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 53 14.7% 25 47.2% 3 208.9 487.4
TITLE WORD 71 19.7% 26 36.6% 20 315.6 971.1
EXACT TITLE 14 3.9% 11 78.6% 2 8.3 11.8
JOURNAL 5 1.4% 2 40.0% 6 103.7 173.5
EXACT JOURNAL 4 1.1% 1 25.0% 10 10.3 9.5
SUBJECT 94 26.0% 41 43.6% 18 208.2 454.6
EXACT SUBJECT 1 0.3% 0 0.0% 8 8.0 0.0
KEYWORD 69 19.1% 9 13.0% 25 212.2 985.9
SUBFILE 0 0.0% 0 0.0% 0 0.0 0.0
PUBLICATION TYPE 1 0.3% 1 100% 0 0.0 0.0
DATE 7 1.9% 1 14.3% 19 45.2 57.7
ADDED 0 0.0% 0 0.0% 0 0.0 0.0
PERIODICAL 27 7.5% 5 18.5% 4 8.1 17.2
EXACT PE 15 4.2% 1 6.7% 3 4.0 4.7
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 0 0.0% 0 0.0% 0 0.0 0.0
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 24 7.1% 9 37.5% 10 42.9 82.4
Single 313 92.9% 105 33.5% 10 208.7 753.5
DISPLAY commands, by type, excluding automatic displays:
REVIEW 2.8%
SHORT 38.0%
LONG 1.4%
FIELDS 1.2%
PERIODICALS 8.7%
COMMENTS 0.0%
Other 47.9%
2.3 Error, EXPLAIN and HELP statistics (MAGS, COMP, & NEWS)
_______________________________________ ____________________
Percent of commands that contained errors 12.3%
Ten most frequent errors:
1. First word of command is invalid 35.5%
2. NS command - no next screen 25.3%
3. FIND command with invalid index name 12.4%
4. PS command - no previous screen 4.5%
5. DISPLAY command contains invalid word 3.6%
6. Search term missing from search command 2.5%
7. Valid command at an inappropriate time 2.4%
8. DISPLAY command - no FIND results 1.2%
9. MAIL command issued w/o email address 0.9%
10. DISPLAY command-record numbers too large 0.9%
11. All others 10.7%
Ten most frequent EXPLAIN requests:
1. LOCATE (ARTICLE DBS) 24.4%
2. GUIDE 21.8%
3. FIND 9.6%
4. COMMANDS 9.2%
5. MAGS DATABASE 6.9%
6. INDEXES 4.6%
7. Unrecognized term 4.0%
8. ADDON SEARCH 4.0%
9. DISPLAYS (IAC DBS) 3.6%
10. NEWS DATABASE 1.0%
11. All others 10.9%
Ten most frequent HELP situations:
1. Help requested from SET DB command 25.3%
2. First word of command is invalid 19.9%
3. FIND command with invalid index name 11.3%
4. DISPLAY command-first of >1 screen 6.5%
5. DISPLAY command-complete in one screen 4.5%
6. FIND command with zero results 4.1%
7. DISPLAY command - middle of >1 screen 3.3%
8. FIND command retrieves >1 book 3.0%
9. NS command - no next screen 2.8%
10. FIND command retrieves 1 book 2.6%
11. All others 16.7%
Ten most frequent SHOW requests:
1. HISTORY 43.5%
2. SEARCH 28.3%
3. IAC NEWS 6.5%
4. SYSTEM NEWS 6.5%
5. LIBRARY NEWS 4.3%
6. MAIL STATUS 4.3%
7. SETTINGS (IAC DBS) 2.2%
8. MAIL SETTINGS 2.2%
11. All others 2.2%
IACmm/dd iac MELVYL IAC DATABASES TELNET STATISTICS (weekly)