检查子分区是否创建成功：
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EXPLAIN PARTITIONS SELECT * FROM msgss;
结果如下图：
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数据切分――Mysql分区表的建立及性能分析(三)
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PARTITION BY RANGE (atime) SUBPARTITION BY HASH (sub_id)
(
PARTITION t0 VALUES LESS THAN(1451577600)
(
SUBPARTITION s0,
SUBPARTITION s1,
SUBPARTITION s2,
SUBPARTITION s3,
SUBPARTITION s4,
SUBPARTITION s5
),
PARTITION t1 VALUES LESS THAN(1483200000)
(
SUBPARTITION s6,
SUBPARTITION s7,
SUBPARTITION s8,
SUBPARTITION s9,
SUBPARTITION s10,
SUBPARTITION s11
),
PARTITION t2 VALUES LESS THAN MAXVALUE
(
SUBPARTITION s12,
SUBPARTITION s13,
SUBPARTITION s14,
SUBPARTITION s15,
SUBPARTITION s16,
SUBPARTITION s17
)
);
检查子分区是否创建成功：
检查子分区是否创建成功：