[GitHub] [incubator-doris] caiconghui commented on a change in pull request #4479: [Apache][Doris]add query cache docs

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caiconghui commented on a change in pull request #4479:
URL: https://github.com/apache/incubator-doris/pull/4479#discussion_r479602225



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File path: docs/zh-CN/administrator-guide/query_cache.md
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@@ -0,0 +1,184 @@
+---
+{
+    "title": "QUERY CACHE",
+    "language": "zh-CN"
+}
+---
+
+<!-- 
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+# QUERY CACHE
+
+
+
+## 一 需求
+
+虽然在数据库层也做了对应的缓存，但这种数据库层次的缓存一般针对的是查询内容，而且粒度也太小，一般只有表中数据没有变更的时候，数据库对应的cache才发挥了作用。但这并不能减少业务系统对数据库产生的增、删、查、改的庞大IO压力。所以数据库缓存技术在此诞生，实现热点数据的高速缓存，提高应用的响应速度，极大缓解后端数据库的压力

Review comment:
       虽然在数据库层  ->  虽然在数据库存储层?
   一般只有表中数据没有变更的时候，数据库对应的cache才发挥了作用 -> 查询结果的高速缓存的实现方案也是需要数据没有变更?
   但这并不能减少业务系统对数据库产生的增、删、查、改的庞大IO压力 -> 但这并不能减少业务系统对数据库进行增删改查所带来的庞大的IO压力? 
   所以数据库缓存技术 在此诞生,  -> 数据库计算层的缓存技术?
   实现热点数据  ->  实现查询结果??




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