可以使用点范围(即开始键和终止键相同)显式地搜索一个已知的hash值。
You can explicitly search for a known hash value with point ranges, in other words ranges with identical start and stop keys.
终止和重新创建索引禁用的外键之后，降级就成功完成了。
After the foreign key constraint with index disabled is dropped and recreated, the reversion completes successfully.
要终止索引禁用的外键约束，重新创建这个参考约束，执行以下命令
To drop the foreign key constraint with index disabled and recreate this referential constraint, issue the following command
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