Update 07-faq.md
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@ -26,4 +26,10 @@ curl: (7) Failed to connect to 127.0.0.1 port 6090: Connection refused
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>请勿使用 systemctl status taosanode 检查 taosanode 是否正常
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<b>2. 查询结果不正确</b>
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<b>2. 服务正常,查询过程返回服务不可用</b>
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```bash
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taos> select _frowts,forecast(current, 'algo=arima, alpha=95, wncheck=0, rows=20, start=1500000000000,every=864000') from d1 where ts<='2017-07-14 10:40:09.999';
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DB error: Analysis service can't access[0x80000441] (60.195613s)
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```
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