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All SQLite error codes
SQLite error code

SQLITE_BUSY_TIMEOUT

SQLITE_BUSY_TIMEOUT is SQLite result code 773, an extended code of SQLITE_BUSY.

Result code773
NameSQLITE_BUSY_TIMEOUT
Primary codeSQLITE_BUSY

What it means

The SQLITE_BUSY_TIMEOUT error code indicates that a blocking Posix advisory file lock request in the VFS layer failed due to a timeout. Blocking Posix advisory locks are only available as a proprietary SQLite extension and even then are only supported if SQLite is compiled with the SQLITE_ENABLE_SETLK_TIMEOUT compile-time option.

Source: SQLite Result and Error Codes