Optimizer tracing: Query Execution Plan descriptions beyond EXPLAIN
Optimizer tracing: Query Execution Plan descriptions beyond EXPLAIN Understanding why MySQL chooses a particular join order or why table scan is chosen instead of range scan is often very hard even for experienced MySQL users. Two almost identical queries, differing only in constant values, may produce completely different plans. That's why we're introducing a great new feature in 5.6: Optimizer T
DimitriK's (dim) Weblog : MySQL Performance: Overhead of Optimizer Tracing in MySQL 5.6
MySQL Performance: Overhead of Optimizer Tracing in MySQL 5.6 MySQL Performance: Overhead of Optimizer Tracing in MySQL 5.6 Last week I was faced to a strange problem while benchmarking MySQL 5.6: some of my user sessions become "frozen" periodically and finally my whole test was not valid.. More in-depth analyze shown that: sessions are "frozen" when executing a SELECT statement.. sessions are no
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