Small. Fast. Reliable.
Choose any three.
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  could quickly seek to any part of the BLOB without reading the leading
  data first. It would also be faster and require less memory for the
  host application.
+ 
+ **Database Meta Data in Virtual Tables**
+ 
+ Currently SQLite's meta data resides in the form of ad-hoc PRAGMA commands.
+ The problem with this approach is that you cannot use a PRAGMA as a
+ sub-select in a complex SQL query to find meta-data relationships without
+ the use of writing custom (non-SQL) code.