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Editorial Team
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Asked: 2026-05-29T04:55:16+00:00

I’m studying sqlite features and I’ve discovered the SQLite Shared-Cache Mode which is disabled

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I’m studying sqlite features and I’ve discovered the SQLite Shared-Cache Mode which is disabled by default.

Shared-Cache is:

intended for use in embedded servers

because it shares a single data and schema cache between threads or processes.
I’m interested in using sqlite (with shared-cache) in PHP (and Python) so my questions are:

1) is every PDO connection in a PHP script to an sqlite DB considered a single isolated connection?

2) if yes, using Shared-Cache Mode could improve performance in an high concurrency scenario; to activate Shared-Cache Mode one have to call this C function:

int sqlite3_enable_shared_cache(int);

how to call that function through PDO?

It seems almost impossible but maybe there is a solution.

Best Regards,
Fabio Buda
Web Developer/Designer @ netdesign

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1 Answer

  1. Editorial Team

    I’ve searched through the PHP source code to find an answer for you. No file in ext/pdo_sqlite/ is ever calling the sqlite3_enable_shared_cache function, which means this is not implemented.

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