| --- |
| title: Continuous Querying |
| --- |
| |
| <!-- |
| 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. |
| --> |
| |
| Continuous querying continuously returns events that match the queries you set up. |
| |
| <a id="continuous__section_779B4E4D06E948618E5792335174E70D"></a> |
| |
| - **[How Continuous Querying Works](how_continuous_querying_works.html)** |
| |
| Clients subscribe to server-side events by using SQL-type query filtering. The server sends all events that modify the query results. CQ event delivery uses the client/server subscription framework. |
| |
| - **[Implementing Continuous Querying](implementing_continuous_querying.html)** |
| |
| Use continuous querying in your clients to receive continuous updates to queries run on the servers. |
| |
| - **[Managing Continuous Querying](continuous_querying_whats_next.html)** |
| |
| This topic discusses CQ management options, CQ states, and retrieving initial result sets. |
| |
| |