要解决这些问题，可以删除无关的索引，添加一个新的索引，或者在某些表中周期性地清除大量过期的数据。
To solve these problems, drop the extraneous index, add a new index, or periodically clean out the large volume of obsolete data in some tables.
对索引所做的更改最初缓存在内存中，并周期性转储到索引目录。
The changes made to the index are initially buffered in the memory and periodically flushed to the index directory.
它使用一个调度程序来发起周期性的事件，比如爬网程序执行和全文索引维护。
It USES a scheduler to initiate periodic events, such as crawler executions and full-text index maintenance.
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