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I know that I can open multiple connections to an In-Memory sqlite database using file:DB_NAME?mode=memory&cache=shared in sqlite3_open_v2().

I open 2 connections to an In-Memory database. One with the flags SQLITE_OPEN_URI | SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE and another with SQLITE_OPEN_READONLY | SQLITE_OPEN_URI.

The problem is that sqlite lets me modify the database even when the connection is Read-Only.

Is there any way to make the connection Read-Only? Should I write my own VFS to accomplish it?

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The SQLITE_OPEN_READONLY flag affects how the database accesses any files and handles transactions.

In shared-cache mode, multiple connections appear as a single connection in the interface to the file system. Therefore, they share the file access/transaction settings.

To prevent a connection from starting any write transactions, use PRAGMA query_only.

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Great! Thank you for the explanation and the solution.

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