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Asked: 2026-05-26T04:19:14+00:00

I have a Pylons application using SQLAlchemy with SQLite as backend. I would like

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I have a Pylons application using SQLAlchemy with SQLite as backend. I would like to know if every read operation going to SQLite will always lead to a hard disk read (which is very slow compared to RAM) or some caching mechanisms are already involved.

  • does SQLite maintain a subset of the database in RAM for faster access ?
  • Can the OS (Linux) do that automatically ?
  • How much speedup could I expect by using a production database (MySQL or PostgreSQL) instead of SQLite?
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1 Answer

  1. Editorial Team

    1. Yes, SQLite has its own memory cache. Check PRAGMA cache_size for instance. Also, if you’re looking for speedups, check PRAGMA temp_store. There is also API for implementing your own cache.

    2. The SQLite database is just a file to the OS. Nothing is ‘automatically’ done for it. To ensure caching does happen, there are sqlite.h defines and runtime pragma settings.

    3. It depends, there are a lot of cases when you’ll get a slowdown instead.

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