MELVYL IAC DATABASES TELNET STATISTICS
Time period: 05/01/99 through 05/31/99
1.0 SUMMARY STATISTICS
_______________________
1.1 Total sessions:
____________________
Location Library Remote Total
________ _______ ______ _____
Berkeley 1,922 3,517 5,439
Davis 5,062 239 5,301
Irvine 5,458 0 5,458
Los Angeles 803 4,318 5,121
Riverside 4,271 332 4,603
San Diego 346 1,213 1,559
San Francisco 693 18 711
Santa Barbara 4,073 736 4,809
Santa Cruz 6,487 1,153 7,640
LBL 0 156 156
LLL 0 54 54
Los Alamos n/a 6 6
Other - UC 48 854 902
Stanford 1,037
Other-Network UC n/a 1,228 1,228
_______ ______ _____
29,163 13,824 44,024
Per hour usage:
Time Sessions Finds Records Displayed
__________ __________ __________ _________________
12-2 a.m. 576 2,873 40,789
2-4 a.m. 201 790 9,743
4-6 a.m. 99 373 4,846
6-8 a.m. 306 912 9,029
8-10 a.m. 2,495 7,758 72,437
10-12 a.m. 5,865 19,800 195,785
12-2 p.m. 8,329 30,024 294,946
2-4 p.m. 9,377 33,810 361,737
4-6 p.m. 7,101 26,785 281,484
6-8 p.m. 4,168 15,743 165,275
8-10 p.m. 3,601 14,376 150,126
10-12 p.m. 1,906 7,814 92,191
__________ __________ __________ _________________
Total: 44,024 161,058 1,678,388
1.2 FIND commands
__________________
Number of FIND commands issued by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 6,646 11,252 17,898
Davis 16,768 623 17,391
Irvine 21,448 0 21,448
Los Angeles 2,983 15,180 18,163
Riverside 15,912 1,079 16,991
San Diego 1,234 3,838 5,072
San Francisco 2,070 86 2,156
Santa Barbara 15,575 2,361 17,936
Santa Cruz 27,077 4,523 31,600
LBL 0 447 447
LLL 0 148 148
Los Alamos n/a 17 17
Other - UC 76 2,831 2,907
Stanford 4,621
Other-Network UC n/a 4,263 4,263
_______ ______ _____
109,789 46,648 161,058
Number of FIND commands by database
MAGS database 145,669
NEWS database 12,304
COMP database 3,085
Total number of FIND commands 161,058
1.3 Records displayed
______________________
Number of Records Displayed by location:
Location Library Remote Total
________ _______ ______ _____
Berkeley 73,930 136,308 210,238
Davis 140,402 4,388 144,790
Irvine 184,959 0 184,959
Los Angeles 36,854 234,076 270,930
Riverside 141,029 12,059 153,088
San Diego 11,251 41,343 52,594
San Francisco 24,075 1,749 25,824
Santa Barbara 163,473 30,521 193,994
Santa Cruz 244,474 44,941 289,415
LBL 0 5,330 5,330
LLL 0 3,043 3,043
Los Alamos n/a 114 114
Other - UC 327 39,215 39,542
Stanford 8,491
Other-Network UC n/a 54,317 54,317
_______ ______ _____
1,020,774 607,404 1,636,669
Number of Records Displayed by database:
MAGS database 1,546,942
NEWS database 94,866
COMP database 36,580
Total number of Records Displayed 1,636,669
1.4 Relative Use of Databases
______________________________
Relative use of MAGS, NEWS, & COMP databases:
Percent of MAGS sessions 87.3%
Percent of NEWS sessions 10.2%
Percent of COMP sessions 2.4%
Percent of searches done in the MAGS database 90.4%
Percent of searches done in the NEWS database 7.6%
Percent of searches done in the COMP database 1.9%
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 4.5
Display response time from receipt of command at
DLA until transmission of a complete screen:
Average in seconds 0.2
Standard deviation in seconds 4.5
2.0 Magazines & Journals Database Statistics
_____________________________________________
Median session length (minutes:seconds) 8:57
Average session length (minutes:seconds) 14:03
Longest session recorded (minutes:seconds) 1049
Average number of searches completed per session 3.7
Retrievals per search - median 5.0
Retrievals per search - average 542.0
Retrievals per search - standard deviation 5573.6
Percent of searches completed with 0 results 32.7%
Percent of searches entered that are long 1.7%
Percent of long searches completed
(includes partial results) 49.9%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 136,169 27.4%
DISPLAY (excluding automatic displays) 220,105 44.2%
HELP 15,384 3.1%
EXPLAIN 10,476 2.1%
SET/RESET 10,024 2.0%
SHOW 2,564 0.5%
ADD ON (AND, OR, AND NOT) 9,500 1.9%
LOGON or LOGOFF 58,439 11.7%
COMMENT 10 0.0%
SAVE 8,596 1.7%
USE 140 0.0%
OTHER 26,372 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 15,225 10.8% 4,533 29.8% 10 79.0 286.1
TITLE WORD 20,737 14.8% 6,598 31.8% 14 414.6 6002.9
EXACT TITLE 3,739 2.7% 1,836 49.1% 3 86.6 428.4
JOURNAL 5,485 3.9% 2,868 52.3% 841 5558.3 14127.8
EXACT JOURNAL 3,540 2.5% 1,481 41.8% 552 4396.7 15289.1
SUBJECT 36,713 26.1% 16,388 44.6% 41 332.5 1212.9
EXACT SUBJECT 1,779 1.3% 890 50.0% 60 524.1 1654.3
KEYWORD 46,461 33.1% 10,195 21.9% 26 993.5 8503.1
SUBFILE 310 0.2% 76 24.5% 27 153.9 340.8
PUBLICATION TYPE 319 0.2% 77 24.1% 16 503.9 2342.5
DATE 1,129 0.8% 226 20.0% 27 133.3 492.7
ADDED 26 0.0% 0 0.0% 20,016 25988.0 18039.7
PERIODICAL 2,470 1.8% 560 22.7% 10 386.3 2570.9
EXACT PE 1,312 0.9% 291 22.2% 5 93.8 837.9
RPE 2 0.0% 2 100% 0 0.0 0.0
XRP 0 0.0% 0 0.0% 0 0.0 0.0
COMMENTS 5 0.0% 4 80.0% 4,066 4066.0 0.0
Other indexes 1,135 0.8% 232 20.4% 178 1147.6 4109.9
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 5,436 4.0% 1,952 35.9% 11 273.9 1822.9
Single 129,272 96.0% 42,269 32.7% 25 857.9 7029.8
DISPLAY commands, by type, excluding automatic displays:
REVIEW 1.5%
SHORT 67.4%
LONG 1.5%
FIELDS 0.6%
PERIODICALS 1.4%
COMMENTS 0.0%
Other 27.6%
2.1 Computer Articles Database Statistics
__________________________________________
Median session length (minutes:seconds) 6:02
Average session length (minutes:seconds) 11:12
Longest session recorded (minutes:seconds) 234:32
Average number of searches completed per session 2.8
Retrievals per search - median 8.0
Retrievals per search - average 963.0
Retrievals per search - standard deviation 6885.7
Percent of searches completed with 0 results 30.5%
Percent of searches entered that are long 2.4%
Percent of long searches completed
(includes partial results) 53.3%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 2,714 24.7%
DISPLAY (excluding automatic displays) 4,472 40.7%
HELP 259 2.4%
EXPLAIN 337 3.1%
SET/RESET 392 3.6%
SHOW 53 0.5%
ADD ON (AND, OR, AND NOT) 371 3.4%
LOGON or LOGOFF 1,448 13.2%
COMMENT 0 0.0%
SAVE 216 2.0%
USE 3 0.0%
OTHER 718 6.5%
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 228 7.9% 129 56.6% 8 100.4 186.5
TITLE WORD 548 19.0% 178 32.5% 30 654.8 2951.0
EXACT TITLE 37 1.3% 19 51.3% 2 6.0 8.4
JOURNAL 79 2.7% 46 58.2% 766 5546.7 11092.7
EXACT JOURNAL 84 2.9% 34 40.5% 182 9089.8 20534.5
SUBJECT 529 18.3% 210 39.7% 65 783.6 2797.6
EXACT SUBJECT 25 0.9% 12 48.0% 306 3194.2 7796.4
KEYWORD 1,147 39.7% 239 20.8% 62 1843.0 10875.1
SUBFILE 0 0.0% 0 0.0% 0 0.0 0.0
PUBLICATION TYPE 17 0.6% 0 0.0% 22 196.3 432.6
DATE 96 3.3% 22 22.9% 22 325.0 2302.4
ADDED 0 0.0% 0 0.0% 0 0.0 0.0
PERIODICAL 45 1.6% 12 26.7% 3 78.1 326.1
EXACT PE 6 0.2% 0 0.0% 3 2.5 1.5
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 48 1.7% 12 25.0% 116 1110.0 3173.4
By number of indexes:
Multiple 192 7.2% 58 30.2% 38 503.7 2388.8
Single 2,486 92.8% 792 31.9% 50 1646.7 9146.7
DISPLAY commands, by type, excluding automatic displays:
REVIEW 3.7%
SHORT 64.9%
LONG 1.0%
FIELDS 1.5%
PERIODICALS 0.7%
COMMENTS 0.0%
Other 28.2%
2.1.1 Article Text
___________________
DISPLAY TEXT commands 32,927
TEXT included with CONTINUOUS, PRINT, CAPTURE, or SLOW 1,990
displays or when any of these paging options is set.
TEXT included with MAIL commands 6,486
SET DISPLAY TEXT commands 6
2.2 Newspaper Articles Database Statistics
___________________________________________
Median session length (minutes:seconds) 5:33
Average session length (minutes:seconds) 10:10
Longest session recorded (minutes:seconds) 254:06
Average number of searches completed per session 2.7
Retrievals per search - median 3.0
Retrievals per search - average 1226.3
Retrievals per search - standard deviation 29584
Percent of searches completed with 0 results 38.5%
Percent of searches entered that are long 1.9%
Percent of long searches completed
(includes partial results) 55.0%
Commands entered, by type, excluding errors:
Total Percentage
__________ __________
FIND 11,606 34.6%
DISPLAY (excluding automatic displays) 8,402 25.0%
HELP 1,571 4.7%
EXPLAIN 978 2.9%
SET/RESET 1,666 5.0%
SHOW 233 0.7%
ADD ON (AND, OR, AND NOT) 698 2.1%
LOGON or LOGOFF 6,079 18.1%
COMMENT 2 0.0%
SAVE 642 1.9%
USE 11 0.0%
OTHER 1,665 5.0%
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 609 5.0% 307 50.4% 22 384.3 733.7
TITLE WORD 2,232 18.4% 747 33.5% 13 500.5 1969.4
EXACT TITLE 203 1.7% 112 55.2% 2 60.1 361.3
JOURNAL 180 1.5% 111 61.7% 161 147775 364990
EXACT JOURNAL 73 0.6% 32 43.8% 184 989.1 2120.4
SUBJECT 4,251 35.1% 1,968 46.3% 51 544.7 1880.6
EXACT SUBJECT 192 1.6% 89 46.4% 114 425.5 1041.8
KEYWORD 3,896 32.2% 1,171 30.1% 20 881.3 5058.2
SUBFILE 1 0.0% 1 100% 0 0.0 0.0
PUBLICATION TYPE 32 0.3% 4 12.5% 89 79.1 126.1
DATE 290 2.4% 74 25.5% 17 266.0 1461.0
ADDED 2 0.0% 1 50.0% 16 16.0 0.0
PERIODICAL 86 0.7% 27 31.4% 21 231.5 556.3
EXACT PE 29 0.2% 7 24.1% 17 35.0 40.9
RPE 3 0.0% 2 66.7% 1 1.0 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 31 0.3% 16 51.6% 3 29.0 59.7
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 591 5.2% 204 34.5% 14 307.0 1357.9
Single 10,884 94.8% 4,252 39.1% 26 2205.1 40018.8
DISPLAY commands, by type, excluding automatic displays:
REVIEW 2.2%
SHORT 51.6%
LONG 2.2%
FIELDS 0.7%
PERIODICALS 0.6%
COMMENTS 0.0%
Other 42.8%
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 37.8%
2. NS command - no next screen 24.2%
3. FIND command with invalid index name 10.0%
4. PS command - no previous screen 5.2%
5. DISPLAY command contains invalid word 3.9%
6. Valid command at an inappropriate time 2.6%
7. Search term missing from search command 2.1%
8. DISPLAY command-record numbers too large 1.1%
9. MAIL command issued w/o email address 1.0%
10. Add-on search, no index name after verb 0.9%
11. All others 11.2%
Ten most frequent EXPLAIN requests:
1. LOCATE (ARTICLE DBS) 22.2%
2. GUIDE 21.9%
3. FIND 7.5%
4. COMMANDS 7.4%
5. INDEXES 5.4%
6. Unrecognized term 5.2%
7. MAGS DATABASE 4.0%
8. DISPLAYS (IAC DBS) 3.6%
9. ADDON SEARCH 3.1%
10. MAIL 2.3%
11. All others 17.4%
Ten most frequent HELP situations:
1. Help requested from SET DB command 20.2%
2. First word of command is invalid 19.4%
3. FIND command with invalid index name 9.3%
4. FIND command with zero results 6.9%
5. DISPLAY command-complete in one screen 5.7%
6. DISPLAY command - middle of >1 screen 5.6%
7. DISPLAY command-first of >1 screen 5.4%
8. FIND command retrieves >1 book 3.5%
9. NS command - no next screen 3.3%
10. PS command - no previous screen 2.5%
11. All others 18.3%
Ten most frequent SHOW requests:
1. SEARCH 39.1%
2. HISTORY 28.9%
3. MAIL STATUS 11.2%
4. MAIL SETTINGS 5.0%
5. IAC NEWS 3.8%
6. GLOSSARY 3.4%
7. SYSTEM NEWS 2.3%
8. SETTINGS (IAC DBS) 1.8%
9. DISPLAY 1.4%
10. LIBRARY NEWS 0.5%
11. All others 2.7%