Vast memory resource is consumed when great capacity data is retrieved while many layers of entities in a database are re - lated like a tree and join operation is carried out.
数据库中多个实体呈树形关联时，对海量数据作多层实体连接运算时要消耗系统大量的内存资源。
Vast memory resource is consumed when great capacity data is retrieved while many layers of entities in a database are re - lated like a tree and join operation is carried out.
数据库中多个实体呈树形关联时，对海量数据作多层实体连接运算时要消耗系统大量的内存资源。
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