Hello,
Do you perform the benchmark on the native database table using cold cache or warm cache? Also, can you briefly describe what the benchmark does and give the schema for the native database table? thanks ________________________________ From: sqlite-users <sqlite-users-boun...@mailinglists.sqlite.org> on behalf of Bob Friesenhahn <bfrie...@simple.dallas.tx.us> Sent: Wednesday, February 8, 2017 2:39 PM To: SQLite mailing list Subject: Re: [sqlite] Virtual table vs real table query performance The case I am interested is pure read performance of a single column element at a time given properly implemented xBestIndex and xFilter support. Rows are not being added/removed using sqlite. It is possible that native tables can be faster since the implementation is not limited to the rigid set of callback functions provided for virtual tables to use and of course the amalgamation is optimized by the compiler as one source module. By tracing the callbacks, we do see that our implementation is not invoking the callbacks more times than necessary (which was not the case before xBestIndex and xFilter support was added). Due to the requirements of the implementation, POSIX reader/writer locks are used so there is some low-contention locking overhead. Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ GraphicsMagick Image Processing System<http://www.graphicsmagick.org/> www.graphicsmagick.org GraphicsMagick is a robust collection of tools and libraries to read, write, and manipulate an image in any of the more popular image formats including GIF, JPEG, PNG ... <http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users> _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
