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21 August 2026
| 17:11 | Current Status and Open Issues diffhist +11,921 Carli talk contribs | ||||
| N 13:01 | Transactions and Isolation diffhist +1,260 Carli talk contribs (Created page with "Every SQL statement runs in an implicit transaction unless the session already has an explicit <code>BEGIN</code>/<code>COMMIT</code>/<code>ROLLBACK</code> transaction. The default cursor-stability mode applies writes directly with undo masks, gives statement atomicity, and rolls back on errors. MemCP also contains an ACID mode with snapshot visibility and optimistic commit conflict detection. Savepoints are used internally for nested trigger/error recovery. Transactio...") | ||||
| N 12:58 | Query Planner and Physical Lowering diffhist +14,007 Carli talk contribs (Created page with "MemCP compiles SQL into executable Scheme code. The planner first converts SQL into a logical representation, decorrelates subqueries, and chooses a join order. Only after those semantic decisions are complete does the physical lowerer select scans, indexes, caches, RecSets, computed columns, and other storage-engine operators. This separation is important: two queries that mean the same thing should reach the same logical representation even when they use different...") | ||||