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其他优化器选项 default_statistics_target 参数说明:为没有用ALTER TABLE SET STATISTICS设置字段目标的表设置缺省统计目标。此参数设置为正数是代表统计信息的样本数量,为负数时,代表使用百分比的形式设置统计目标,负数转换为对应的百分比
all copyright interest in the library `Frob' (a library for tweaking knobs) written by James Random Hacker. <signature of Ty Coon>, 1 April 1990
all copyright interest in the library `Frob' (a library for tweaking knobs) written by James Random Hacker. <signature of Ty Coon>, 1 April 1990