HRESULT 0x87AF090A (SQLITE_E_IOERR_RDLOCK): meaning and diagnosis

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Description:

SQLite could not obtain a read lock through the VFS.

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SQLITE_E_CONSTRAINT_UNIQUE	SQLITE_E_CONSTRAINT_VTAB

SQLITE_E_IOERR_RDLOCK

SQLITE_E_IOERR_RDLOCK corresponds to SQLITE_IOERR_RDLOCK. SQLite reported an error in xLock while trying to obtain a read lock.

Determine whether the database is accessed over a network or virtual filesystem where advisory locks may be unreliable.
Check concurrent processes, service identities, and open file handles before changing SQL retry logic.
For WAL mode, keep all processes that read and write the database on the same host whenever possible.

PRAGMA journal_mode;