41. Release notes

This chapter lists the changes in each Miraj version, from the most recent to the oldest.

41.1 Version 1.0.2-beta#

Concurrent transactions (MV-OCC) give more reliable results: consistent reads, phantoms, exact-key lookups and stored functions.
A transaction that touches several databases is now atomic.
A whole-table UPDATE on a very large table no longer crashes the server. If memory runs out, it returns error 9067.
LOAD DATA … SET no longer shifts the TIMESTAMP.
Triggers handle temporary tables and foreign_key_checks better.
The server holds many more simultaneous connections: the listen backlog goes from 128 to 4096 and each connection uses less memory. Under heavy concurrency, table locks no longer get stuck.

LOAD DATA is faster and uses less memory on large files (tested on 10 M rows).
Restart after an abrupt shutdown is faster.
ALTER TABLE on a large table is almost instant, because the data is no longer copied.
Bulk UPDATE, triggers, secondary indexes, COUNT(DISTINCT) and range queries on disk tables are faster.
max_statement_time goes from 5 to 30 minutes by default.