What causes SQLite shared in-memory DB to disappear?

Last connection closes, kernel reclaims pages—volatility rule, even with cache=shared.

Why doesn't deserialize() restore to shared SQLite cache?

It privatizes the connection's pager, ejecting it from shared ring; others see empty cache.

How to persist SQLite in-memory data across connections?

Use D-MemFS for snapshots, courier (:memory:) + backup() to load into shared URI cleanly.

SQLite's Shared In-Memory Black Hole: Why deserialize() Ghosts You

Staring at an empty table after deserialize() promised salvation—that's the SQLite shared in-memory trap no one warns you about. Here's the cynical fix after 20 years of these gotchas.

theAIcatchup Apr 08, 2026 3 min read

SQLite shared in-memory database vanishing into black hole with deserialize code failing

⚡ Key Takeaways

SQLite shared :memory: vanishes on last connection close, dummy hack is brittle. 𝕏
deserialize() breaks sharing by privatizing the pager—use courier + backup() instead. 𝕏
D-MemFS enables fast, disk-free snapshots; pure Python fix for I/O pains. 𝕏

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#D-MemFS #Python sqlite3 #SQLite #in-memory database

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Originally reported by dev.to

⚡ Key Takeaways

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