很多程序员在使用codeigniter CLI下执行一个大批量数据导入的问题时，会一直出现内存过高的情况，下面对此分析器原因及解决办法。
CI db会将所有的查询sql和和sql执行时间保存下来，对于类似百万级大数据量的导入问题来说，其执行的sql记录都会被保存在内容中，这就占用了大量的内容直至脚本结束。
解决办法：
当你执行大数量的db操作时，记得设置：
$this->db->save_queries = FALSE;
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