Lyrebird · Realistic synthetic test databases, generated fully offline

MySQL · Chinook

MediaType

Source rows
5
Synthetic rows
5
Broken foreign keys
No foreign keys
Rows equal to a source row
100%

Every synthetic row matches a source row outside its keys. Kept reference data and resampled source values match by design, and columns with few possible values can match by chance: see how each column was generated below. You can review, replace or remove kept values before you publish a profile.

Rows

Both databases, first rows by primary key, in one table: scrolling sideways moves them together. Rows at the same position are unrelated, unless the table holds kept reference data. Long values are cut at 60 characters.

MediaTypeId keyName
Source database · 5 of 5 rows
1MPEG audio file
2Protected AAC audio file
3Protected MPEG-4 video file
4Purchased AAC audio file
5AAC audio file
Synthetic database · 5 of 5 rows
1MPEG audio file
2Protected AAC audio file
3Protected MPEG-4 video file
4Purchased AAC audio file
5AAC audio file

Column by column

Each figure is computed from all rows of both databases in the same way. S is the source, Y the synthetic copy. Difference runs from 0 (same distribution) to 1 (no overlap): Kolmogorov-Smirnov for numbers and times, total variation for columns with few values. Personal columns are meant to differ, so they show how many values also appear in the source instead. Lyrebird draws names from built-in lists, not from the source, so common names can match.

Column Model read it as How it was generated Empty Distinct Range or length Most common Difference
MediaTypeIdint record key New key values S 0%
Y 0%
S 5
Y 5
S 1 → 5
Y 1 → 5
S 1 20% · 2 20% · 3 20% · 4 20% · 5 20%
Y 1 20% · 2 20% · 3 20% · 4 20% · 5 20%
—
Namevarchar(120) title name Kept from the source as reference data S 0%
Y 0%
S 5
Y 5
S 20.8 chars avg
Y 20.8 chars avg
S MPEG audio file 20% · Protected AAC audio file 20% · Protected MPEG-4 video file 20% · Purchased AAC audio file 20% · AAC audio file 20%
Y MPEG audio file 20% · Protected AAC audio file 20% · Protected MPEG-4 video file 20% · Purchased AAC audio file 20% · AAC audio file 20%
0 TVD