diff --git a/docs/zh/07-develop/06-stream.md b/docs/zh/07-develop/06-stream.md index ee5969143a..dbf8684008 100644 --- a/docs/zh/07-develop/06-stream.md +++ b/docs/zh/07-develop/06-stream.md @@ -71,7 +71,7 @@ Query OK, 4 rows in database (0.012033s) ``` ## 示例二 -查询所有电表中电压等于 220V 的数据，对过滤出的电表电流数据进行四舍五入运算，同时将主键时间戳列转换为 bigint 类型，并对采集的数据按表名分组。 +某运营商平台要采集机房所有服务器的系统资源指标，包含 cpu、内存、网络延迟等，采集后需要对数据进行四舍五入运算，将地域和服务器名以下划线拼接，然后将结果按时间排序并以服务器名分组输出到新的数据表中。 ### 创建 DB 和原始数据表 首先准备数据，完成建库、建一张超级表和多张子表操作 @@ -80,47 +80,49 @@ Query OK, 4 rows in database (0.012033s) drop database if exists stream_db; create database stream_db; -create stable stream_db.meters (ts timestamp, current float, voltage int) TAGS (location varchar(64), groupId int); +create stable stream_db.idc (ts timestamp, cpu float, mem float, latency float) TAGS (location varchar(64), groupId int); -create table stream_db.d1001 using stream_db.meters tags("beijing", 1); -create table stream_db.d1002 using stream_db.meters tags("shanghai", 2); -create table stream_db.d1003 using stream_db.meters tags("beijing", 2); -create table stream_db.d1004 using stream_db.meters tags("tianjin", 3); -create table stream_db.d1005 using stream_db.meters tags("shanghai", 1); +create table stream_db.server01 using stream_db.idc tags("beijing", 1); +create table stream_db.server02 using stream_db.idc tags("shanghai", 2); +create table stream_db.server03 using stream_db.idc tags("beijing", 2); +create table stream_db.server04 using stream_db.idc tags("tianjin", 3); +create table stream_db.server05 using stream_db.idc tags("shanghai", 1); ``` ### 创建流 ```sql -create stream stream2 into stream_db.stream2_output_stb as select ts,cast(ts as bigint),round(current),location from stream_db.meters where voltage=220 partition by tbname; +create stream stream2 into stream_db.stream2_output_stb as select ts, concat_ws("_", location, tbname) as server_location, round(cpu) as cpu, round(mem) as mem, round(latency) as latency from stream_db.idc partition by tbname order by ts; ``` ### 写入数据 ```sql -insert into stream_db.d1001 values(now-14h, 10.3, 210); -insert into stream_db.d1001 values(now-13h, 13.5, 220); -insert into stream_db.d1002 values(now-12h, 14.7, 218); -insert into stream_db.d1002 values(now-11h, 10.5, 220); -insert into stream_db.d1003 values(now-10h, 11.5, 220); -insert into stream_db.d1003 values(now-9h, 12.3, 215); -insert into stream_db.d1004 values(now-8h, 11.5, 220); -insert into stream_db.d1004 values(now-7h, 15.3, 217); -insert into stream_db.d1005 values(now-6h, 16.5, 216); -insert into stream_db.d1005 values(now-5h, 12.3, 220); +insert into stream_db.server01 values(now-14h, 50.9, 654.8, 23.11); +insert into stream_db.server01 values(now-13h, 13.5, 221.2, 11.22); +insert into stream_db.server02 values(now-12h, 154.7, 218.3, 22.33); +insert into stream_db.server02 values(now-11h, 120.5, 111.5, 5.55); +insert into stream_db.server03 values(now-10h, 101.5, 125.6, 5.99); +insert into stream_db.server03 values(now-9h, 12.3, 165.6, 6.02); +insert into stream_db.server04 values(now-8h, 160.9, 120.7, 43.51); +insert into stream_db.server04 values(now-7h, 240.9, 520.7, 54.55); +insert into stream_db.server05 values(now-6h, 190.9, 320.7, 55.43); +insert into stream_db.server05 values(now-5h, 110.9, 600.7, 35.54); ``` ### 查询以观查结果 ```sql -taos> select * from stream_db.stream2_output_stb; - ts | cast(ts as bigint) | round(current) | location | group_id | -================================================================================================================================== - 2022-08-08 09:29:55.557 | 1659922195557 | 12.00000 | beijing | 7226905450883977166 | - 2022-08-08 11:29:55.570 | 1659929395570 | 12.00000 | tianjin | 7226905450884501455 | - 2022-08-08 08:29:55.549 | 1659918595549 | 11.00000 | shanghai | 7226905450883452877 | - 2022-08-08 06:29:55.534 | 1659911395534 | 14.00000 | beijing | 7226905450882928588 | - 2022-08-08 14:29:56.175 | 1659940196175 | 12.00000 | shanghai | 7226905450895708112 | -Query OK, 5 rows in database (0.015235s) +taos> select ts, server_location, cpu, mem, latency from stream_db.stream2_output_stb; + ts | server_location | cpu | mem | latency | +================================================================================================================================ + 2022-08-09 21:24:56.785 | beijing_server01 | 51.00000 | 655.00000 | 23.00000 | + 2022-08-09 22:24:56.795 | beijing_server01 | 14.00000 | 221.00000 | 11.00000 | + 2022-08-09 23:24:56.806 | shanghai_server02 | 155.00000 | 218.00000 | 22.00000 | + 2022-08-10 00:24:56.815 | shanghai_server02 | 121.00000 | 112.00000 | 6.00000 | + 2022-08-10 01:24:56.826 | beijing_server03 | 102.00000 | 126.00000 | 6.00000 | + 2022-08-10 02:24:56.838 | beijing_server03 | 12.00000 | 166.00000 | 6.00000 | + 2022-08-10 03:24:56.846 | tianjin_server04 | 161.00000 | 121.00000 | 44.00000 | + 2022-08-10 04:24:56.853 | tianjin_server04 | 241.00000 | 521.00000 | 55.00000 | + 2022-08-10 05:24:56.866 | shanghai_server05 | 191.00000 | 321.00000 | 55.00000 | + 2022-08-10 06:24:57.301 | shanghai_server05 | 111.00000 | 601.00000 | 36.00000 | +Query OK, 10 rows in database (0.022950s) ``` -## 示例三 -...待续 -