QA catalogue for analysing library data

en | de | pt | hu
number of records: 2,953,005     last data update: 2026-06-25 22:15

Timeline of changes

How did the catalogue change over time? There are two types of issues:

  • the value clearly breaks a well documented constraint. E.g. if the value of 245$ind1 is a space, that is a clear issue, because 245's first indicator is defined in Library of Congress MARC21, as it should contains either 0 or 1.
  • there is a data element which is not defined in MARC21 or in its known extensions, so we can not judge its validity because we do not know its rules. E.g. 024$9 - we are not sure if it is an issue, it might be a legal locally defined subfieeld, because 9 is reserved for that (however it also might be a typo). 250$p - we are also not sure, but since it is not 9, the probability that it is a legal locally defined subfield is much lesser. In both cases it might happen, that the record is imported from somewhere else, and the local definition is available in its original organisation, but in the current catalogue it is out of context.

all issues covers both types of issues, issues in documented data elements covers only the first type. change in records represents the difference in the number of "good" records (not having the first issue type) between the previous and current measurement. change in % represents the difference in the percentage of "good" records (no having the first issue type) between the previous and current measurement.

all issues issues in documented data elements change
version records without with without with in records in %
2023-07-24 4,674,498
0.36%
99.64%
17,015
4,657,483
48.25%
51.75%
2,255,663
2,418,835
2023-10-02 4,674,498
0.36%
99.64%
17,015
4,657,483
48.25%
51.75%
2,255,663
2,418,835
0 0.000%
2023-10-09 4,674,498
0.36%
99.64%
17,015
4,657,483
48.25%
51.75%
2,255,663
2,418,835
0 0.000%
2023-11-13 4,677,749
0.36%
99.64%
17,028
4,660,721
48.23%
51.77%
2,255,857
2,421,892
+194 -0.029%
2023-11-20 4,680,023
48.92%
51.08%
2,289,480
2,390,543
48.92%
51.08%
2,289,486
2,390,537
+33,629 +0.695%
2023-11-27 4,684,734
46.79%
53.21%
2,191,878
2,492,856
49.22%
50.78%
2,305,790
2,378,944
+16,304 +0.299%
2023-12-04 4,686,798
44.75%
55.25%
2,097,300
2,589,498
50.70%
49.30%
2,376,248
2,310,550
+70,458 +1.482%
2023-12-11 4,689,147
44.40%
55.60%
2,082,159
2,606,988
51.93%
48.07%
2,435,136
2,254,011
+58,888 +1.230%
2023-12-18 4,692,601
44.26%
55.74%
2,077,048
2,615,553
55.53%
44.47%
2,605,974
2,086,627
+170,838 +3.602%
2023-12-25 4,694,190
44.21%
55.79%
2,075,336
2,618,854
62.00%
38.00%
2,910,366
1,783,824
+304,392 +6.466%
2024-01-01 4,694,298
44.78%
55.22%
2,102,101
2,592,197
70.25%
29.75%
3,297,679
1,396,619
+387,313 +8.249%
2024-01-22 4,701,076
73.19%
26.81%
3,440,572
1,260,504
73.19%
26.81%
3,440,598
1,260,478
+142,919 +2.939%
2024-01-29 4,702,572
73.30%
26.70%
3,446,961
1,255,611
73.30%
26.70%
3,446,987
1,255,585
+6,389 +0.113%
2024-04-01 4,728,718
73.32%
26.68%
3,467,109
1,261,609
73.32%
26.68%
3,467,135
1,261,583
+20,148 +0.021%
2024-04-08 4,730,753
73.87%
26.13%
3,494,593
1,236,160
73.87%
26.13%
3,494,619
1,236,134
+27,484 +0.549%
2024-04-15 4,733,534
73.83%
26.17%
3,494,775
1,238,759
73.83%
26.17%
3,494,801
1,238,733
+182 -0.040%
2024-04-22 4,736,451
74.96%
25.04%
3,550,239
1,186,212
74.96%
25.04%
3,550,265
1,186,186
+55,464 +1.126%
2024-04-29 4,738,754
74.93%
25.07%
3,550,566
1,188,188
74.93%
25.07%
3,550,593
1,188,161
+328 -0.030%
2024-05-06 4,740,198
74.95%
25.05%
3,552,862
1,187,336
74.95%
25.05%
3,552,889
1,187,309
+2,296 +0.026%
2024-05-13 4,741,424
78.18%
21.82%
3,706,646
1,034,778
78.18%
21.82%
3,706,675
1,034,749
+153,786 +3.224%
2024-05-20 4,745,260
79.75%
20.25%
3,784,419
960,841
79.75%
20.25%
3,784,448
960,812
+77,773 +1.576%
2024-05-27 4,749,108
82.41%
17.59%
3,913,877
835,231
82.45%
17.55%
3,915,691
833,417
+131,243 +2.699%
2024-06-03 4,751,475
85.89%
14.11%
4,080,834
670,641
85.94%
14.06%
4,083,297
668,178
+167,606 +3.486%
2024-06-10 4,754,281
86.84%
13.16%
4,128,568
625,713
86.89%
13.11%
4,131,151
623,130
+47,854 +0.956%
2024-06-17 4,756,505
86.81%
13.19%
4,129,328
627,177
86.87%
13.13%
4,131,911
624,594
+760 -0.025%
2024-06-24 4,759,469
88.19%
11.81%
4,197,408
562,061
88.25%
11.75%
4,199,997
559,472
+68,086 +1.376%
2024-07-01 4,762,714
88.14%
11.86%
4,198,094
564,620
88.20%
11.80%
4,200,683
562,031
+686 -0.046%
2024-07-08 4,766,267
90.75%
9.25%
4,325,337
440,930
90.80%
9.20%
4,327,926
438,341
+127,243 +2.604%
2024-07-15 4,770,760
90.99%
9.01%
4,341,070
429,690
91.05%
8.95%
4,343,659
427,101
+15,733 +0.244%
2024-07-22 4,772,581
90.96%
9.04%
4,341,362
431,219
91.02%
8.98%
4,343,951
428,630
+292 -0.029%
2024-07-29 4,774,325
90.94%
9.06%
4,341,639
432,686
90.99%
9.01%
4,344,228
430,097
+277 -0.027%
2024-08-05 4,776,553
90.91%
9.09%
4,342,327
434,226
90.96%
9.04%
4,344,916
431,637
+688 -0.028%
2024-08-12 4,778,865
90.87%
9.13%
4,342,754
436,111
90.93%
9.07%
4,345,343
433,522
+427 -0.035%
2024-08-19 4,779,787
90.92%
9.08%
4,345,553
434,234
90.97%
9.03%
4,348,142
431,645
+2,799 +0.041%
2024-08-26 4,783,816
90.84%
9.16%
4,345,761
438,055
90.90%
9.10%
4,348,350
435,466
+208 -0.072%
2024-09-02 4,787,305
90.80%
9.20%
4,346,651
440,654
90.85%
9.15%
4,349,242
438,063
+892 -0.048%
2024-09-09 4,790,240
90.75%
9.25%
4,347,116
443,124
90.80%
9.20%
4,349,707
440,533
+465 -0.046%
2024-09-16 4,793,232
90.70%
9.30%
4,347,556
445,676
90.76%
9.24%
4,350,147
443,085
+440 -0.048%
2024-09-23 4,796,222
90.73%
9.27%
4,351,460
444,762
90.78%
9.22%
4,354,051
442,171
+3,904 +0.025%
2024-09-30 4,802,662
90.62%
9.38%
4,352,079
450,583
90.67%
9.33%
4,354,670
447,992
+619 -0.109%
2024-10-07 4,805,245
90.48%
9.52%
4,347,584
457,661
90.53%
9.47%
4,350,175
455,070
-4,495 -0.142%
2024-10-14 4,809,140
90.40%
9.60%
4,347,664
461,476
90.46%
9.54%
4,350,255
458,885
+80 -0.072%
2024-10-21 4,812,309
90.35%
9.65%
4,347,724
464,585
90.40%
9.60%
4,350,315
461,994
+60 -0.058%
2024-10-28 4,815,162
90.30%
9.70%
4,347,944
467,218
90.35%
9.65%
4,350,535
464,627
+220 -0.049%
2024-11-11 4,824,024
90.35%
9.65%
4,358,491
465,533
90.40%
9.60%
4,361,082
462,942
+10,547 +0.053%
2024-11-18 4,825,236
90.33%
9.67%
4,358,658
466,578
90.38%
9.62%
4,361,249
463,987
+167 -0.019%
2024-11-25 4,828,914
90.24%
9.76%
4,357,401
471,513
90.29%
9.71%
4,359,992
468,922
-1,257 -0.095%
2024-12-02 4,832,038
90.22%
9.78%
4,359,513
472,525
90.27%
9.73%
4,362,104
469,934
+2,112 -0.015%
2024-12-09 4,835,815
90.16%
9.84%
4,359,734
476,081
90.21%
9.79%
4,362,325
473,490
+221 -0.066%
2024-12-16 4,838,973
90.09%
9.91%
4,359,424
479,549
90.14%
9.86%
4,362,015
476,958
-310 -0.065%
2025-01-06 4,843,692
89.97%
10.03%
4,357,742
485,950
90.02%
9.98%
4,360,333
483,359
-1,682 -0.123%
2025-01-13 4,847,313
90.96%
9.04%
4,409,291
438,022
91.02%
8.98%
4,411,882
435,431
+51,549 +0.996%
2025-01-20 4,832,014
91.19%
8.81%
4,406,269
425,745
91.24%
8.76%
4,408,860
423,154
-3,022 +0.226%
2025-01-27 4,835,406
91.11%
8.89%
4,405,631
429,775
91.17%
8.83%
4,408,222
427,184
-638 -0.077%
2025-02-03 0
0.00%
0.00%
0
0
0.00%
0.00%
0
0
-4,408,222 -91.165%
2025-02-10 4,843,377
90.34%
9.66%
4,375,724
467,653
90.40%
9.60%
4,378,314
465,063
0 0.000%
2025-02-17 4,846,140
90.31%
9.69%
4,376,403
469,737
90.36%
9.64%
4,378,993
467,147
+679 -0.038%
2025-02-24 4,847,784
90.28%
9.72%
4,376,504
471,280
90.33%
9.67%
4,379,094
468,690
+101 -0.029%
2025-03-10 4,847,784
90.28%
9.72%
4,376,504
471,280
90.33%
9.67%
4,379,094
468,690
0 0.000%
2025-03-17 4,847,784
90.28%
9.72%
4,376,504
471,280
90.33%
9.67%
4,379,094
468,690
0 0.000%
2025-03-24 4,847,784
90.28%
9.72%
4,376,504
471,280
90.33%
9.67%
4,379,094
468,690
0 0.000%
2025-03-31 4,847,784
90.28%
9.72%
4,376,504
471,280
90.33%
9.67%
4,379,094
468,690
0 0.000%
2025-04-07 4,847,784
90.28%
9.72%
4,376,504
471,280
90.33%
9.67%
4,379,094
468,690
0 0.000%
2025-06-02 4,870,438
89.84%
10.16%
4,375,445
494,993
89.89%
10.11%
4,378,046
492,392
-1,048 -0.442%
2025-06-09 4,874,377
89.77%
10.23%
4,375,543
498,834
89.82%
10.18%
4,378,142
496,235
+96 -0.071%
2025-06-23 4,880,436
89.58%
10.42%
4,372,031
508,405
89.64%
10.36%
4,374,631
505,805
-3,511 -0.183%
2025-06-30 4,883,147
89.47%
10.53%
4,369,125
514,022
89.53%
10.47%
4,371,726
511,421
-2,905 -0.109%
2025-07-07 4,886,317
89.40%
10.60%
4,368,207
518,110
89.45%
10.55%
4,370,807
515,510
-919 -0.077%
2025-07-14 299,348
88.78%
11.22%
265,761
33,587
88.78%
11.22%
265,764
33,584
-4,105,043 -0.669%
2025-07-21 868,071
91.00%
9.00%
789,945
78,126
91.00%
9.00%
789,949
78,122
+524,185 +2.220%
2025-07-28 1,261,065
92.43%
7.57%
1,165,594
95,471
92.48%
7.52%
1,166,213
94,852
+376,264 +1.478%
2025-08-04 1,618,941
90.17%
9.83%
1,459,848
159,093
90.33%
9.67%
1,462,405
156,536
+296,192 -2.147%
2025-08-11 4,900,247
89.21%
10.79%
4,371,345
528,902
89.26%
10.74%
4,373,945
526,302
+2,911,540 -1.071%
2025-08-18 1,622,778
90.02%
9.98%
1,460,771
162,007
90.17%
9.83%
1,463,328
159,450
-2,910,617 +0.915%
2025-08-25 1,714,960
86.67%
13.33%
1,486,358
228,602
86.82%
13.18%
1,488,915
226,045
+25,587 -3.355%
2025-09-01 1,870,436
87.15%
12.85%
1,630,116
240,320
87.29%
12.71%
1,632,674
237,762
+143,759 +0.469%
2025-09-08 1,881,547
86.61%
13.39%
1,629,590
251,957
86.75%
13.25%
1,632,148
249,399
-526 -0.543%
2025-09-15 1,896,892
86.45%
13.55%
1,639,850
257,042
86.58%
13.42%
1,642,415
254,477
+10,267 -0.160%
2025-09-22 1,901,627
86.34%
13.66%
1,641,924
259,703
86.48%
13.52%
1,644,490
257,137
+2,075 -0.106%
2025-09-29 1,906,813
86.24%
13.76%
1,644,495
262,318
86.38%
13.62%
1,647,061
259,752
+2,571 -0.100%
2025-10-06 1,913,748
86.06%
13.94%
1,646,958
266,790
86.19%
13.81%
1,649,524
264,224
+2,463 -0.184%
2025-10-13 1,928,329
85.90%
14.10%
1,656,487
271,842
86.04%
13.96%
1,659,054
269,275
+9,530 -0.158%
2025-10-20 1,978,954
86.07%
13.93%
1,703,384
275,570
86.20%
13.80%
1,705,951
273,003
+46,897 +0.169%
2025-10-27 2,043,328
84.40%
15.60%
1,724,576
318,752
84.53%
15.47%
1,727,146
316,182
+21,195 -1.679%
2025-11-03 2,399,387
86.17%
13.83%
2,067,654
331,733
86.28%
13.72%
2,070,243
329,144
+343,097 +1.756%
2025-11-10 2,417,989
86.12%
13.88%
2,082,321
335,668
86.23%
13.77%
2,084,918
333,071
+14,675 -0.057%
2025-11-17 2,433,568
85.64%
14.36%
2,084,167
349,401
85.75%
14.25%
2,086,769
346,799
+1,851 -0.476%
2025-11-24 2,442,712
85.54%
14.46%
2,089,426
353,286
85.64%
14.36%
2,092,034
350,678
+5,265 -0.105%
2025-12-01 2,448,864
85.57%
14.43%
2,095,385
353,479
85.67%
14.33%
2,097,994
350,870
+5,960 +0.028%
2025-12-08 2,455,369
85.44%
14.56%
2,097,757
357,612
85.54%
14.46%
2,100,369
355,000
+2,375 -0.130%
2025-12-15 2,537,139
85.56%
14.44%
2,170,747
366,392
85.66%
14.34%
2,173,369
363,770
+73,000 +0.120%
2025-12-22 2,590,775
85.72%
14.28%
2,220,746
370,029
85.82%
14.18%
2,223,370
367,405
+50,001 +0.157%
2026-02-02 2,824,064
84.78%
15.22%
2,394,261
429,803
84.87%
15.13%
2,396,889
427,175
+173,519 -0.945%
2026-02-09 2,835,802
84.75%
15.25%
2,403,338
432,464
84.84%
15.16%
2,405,966
429,836
+9,077 -0.031%
2026-02-16 2,855,609
84.77%
15.23%
2,420,707
434,902
84.86%
15.14%
2,423,339
432,270
+17,373 +0.020%
2026-02-23 2,867,847
84.75%
15.25%
2,430,466
437,381
84.84%
15.16%
2,433,098
434,749
+9,759 -0.022%
2026-03-02 4,901,574
74.97%
25.03%
3,674,942
1,226,632
75.03%
24.97%
3,677,534
1,224,040
+1,244,436 -9.813%
2026-03-09 4,904,957
74.68%
25.32%
3,662,920
1,242,037
74.73%
25.27%
3,665,513
1,239,444
-12,021 -0.297%
2026-03-23 2,881,795
58.65%
41.35%
1,690,314
1,191,481
58.75%
41.25%
1,692,945
1,188,850
-1,972,568 -15.985%
2026-03-30 2,889,229
58.31%
41.69%
1,684,620
1,204,609
58.40%
41.60%
1,687,249
1,201,980
-5,696 -0.348%
2026-04-06 2,895,736
58.15%
41.85%
1,683,756
1,211,980
58.24%
41.76%
1,686,393
1,209,343
-856 -0.161%
2026-05-06 2,917,740
57.33%
42.67%
1,672,820
1,244,920
57.42%
42.58%
1,675,456
1,242,284
-10,937 -0.814%
2026-05-08 2,920,439
57.22%
42.78%
1,671,044
1,249,395
57.31%
42.69%
1,673,682
1,246,757
-1,774 -0.114%
2026-05-09 2,920,944
57.21%
42.79%
1,671,175
1,249,769
57.30%
42.70%
1,673,812
1,247,132
+130 -0.005%
2026-05-10 2,920,978
57.21%
42.79%
1,671,182
1,249,796
57.30%
42.70%
1,673,819
1,247,159
+7 -0.000%
2026-05-11 2,921,013
57.21%
42.79%
1,671,185
1,249,828
57.30%
42.70%
1,673,822
1,247,191
+3 -0.001%
2026-05-12 2,921,665
57.20%
42.80%
1,671,273
1,250,392
57.29%
42.71%
1,673,911
1,247,754
+89 -0.010%
2026-05-13 2,923,816
57.21%
42.79%
1,672,770
1,251,046
57.30%
42.70%
1,675,408
1,248,408
+1,497 +0.009%
2026-05-14 2,924,577
57.20%
42.80%
1,672,959
1,251,618
57.29%
42.71%
1,675,596
1,248,981
+188 -0.008%
2026-05-15 2,924,583
57.20%
42.80%
1,672,958
1,251,625
57.29%
42.71%
1,675,595
1,248,988
-1 -0.000%
2026-05-16 2,924,591
57.20%
42.80%
1,672,957
1,251,634
57.29%
42.71%
1,675,594
1,248,997
-1 -0.000%
2026-05-17 2,924,591
57.20%
42.80%
1,672,957
1,251,634
57.29%
42.71%
1,675,594
1,248,997
0 0.000%
2026-05-18 2,924,596
57.20%
42.80%
1,672,957
1,251,639
57.29%
42.71%
1,675,594
1,249,002
0 -0.000%
2026-05-19 2,925,308
57.20%
42.80%
1,673,148
1,252,160
57.29%
42.71%
1,675,786
1,249,522
+192 -0.007%
2026-05-20 2,926,498
57.18%
42.82%
1,673,423
1,253,075
57.27%
42.73%
1,676,061
1,250,437
+275 -0.014%
2026-05-21 2,928,487
57.16%
42.84%
1,673,849
1,254,638
57.25%
42.75%
1,676,487
1,252,000
+426 -0.024%
2026-05-22 2,929,877
57.15%
42.85%
1,674,522
1,255,355
57.24%
42.76%
1,677,161
1,252,716
+674 -0.004%
2026-05-23 2,931,171
57.14%
42.86%
1,675,002
1,256,169
57.23%
42.77%
1,677,642
1,253,529
+481 -0.009%
2026-05-24 2,931,185
57.14%
42.86%
1,675,005
1,256,180
57.23%
42.77%
1,677,645
1,253,540
+3 -0.000%
2026-05-25 2,931,196
57.14%
42.86%
1,675,005
1,256,191
57.23%
42.77%
1,677,645
1,253,551
0 -0.000%
2026-06-25 2,953,005
56.67%
43.33%
1,673,418
1,279,587
56.76%
43.24%
1,676,043
1,276,962
-1,602 -0.477%