{"id": "performance:performance-immutable-mode", "page": "performance", "ref": "performance-immutable-mode", "title": "Immutable mode", "content": "If you can be certain that a SQLite database file will not be changed by another process you can tell Datasette to open that file in  immutable mode . \n             Doing so will disable all locking and change detection, which can result in improved query performance. \n             This also enables further optimizations relating to HTTP caching, described below. \n             To open a file in immutable mode pass it to the datasette command using the  -i  option: \n             datasette -i data.db \n             When you open a file in immutable mode like this Datasette will also calculate and cache the row counts for each table in that database when it first starts up, further improving performance.", "breadcrumbs": "[\"Performance and caching\"]", "references": "[]"}