Commits on Oct 19, 2024

1. libstore: use sqlit3 IMMEDIATE transactions …

   The default transaction behavior (of Sqlite3) is DEFERRED.
   
   DEFERRED means that the transaction does not actually start until the
   database is first accessed. Internally, the BEGIN DEFERRED statement
   merely sets a flag on the database connection that turns off the
   automatic commit that would normally occur when the last statement
   finishes. This causes the transaction that is automatically started to
   persist until an explicit COMMIT or ROLLBACK or until a rollback is
   provoked by an error or an ON CONFLICT ROLLBACK clause. If the first
   statement after BEGIN DEFERRED is a SELECT, then a read transaction is
   started. Subsequent write statements will upgrade the transaction to a
   write transaction if possible, or return SQLITE_BUSY. If the first
   statement after BEGIN DEFERRED is a write statement, then a write
   transaction is started.
   
   IMMEDIATE causes the database connection to start a new write
   immediately, without waiting for a write statement. The BEGIN IMMEDIATE
   might fail with SQLITE_BUSY if another write transaction is already
   active on another database connection.
   
   source: https://www.sqlite.org/lang_transaction.html#immediate
   
   Because Nix only uses transactions for write operations, changing the
   default will allow pushing the SQLITE_BUSY errors early instead of
   mid-transaction.

   

   zimbatm committed Oct 19, 2024
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