目录1. EXPLAIN PLAN 简介2. EXPLAIN PLAN 输出解释3. 关键性能指标1. Cost（成本）2. Cardinality（基数）3. Rows（返回行数）4. Time（执行时间）5. Operation（操作类型）6. Predicate Information（谓词信息）4.
I\'m not thrilled with the argument-passing architecture I\'m evolving for the (many) Perl scripts that have been developed for some scripts that call various Hadoop MapReduce jobs.
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