在 GaussDB 官方社区，开发者发布了两张高斯数据库的体系架构图，以 Oracle 的思路绘制出来，展示了 GaussDB 的架构体系，一目了然，值得对照。
在数据库启动日志可以看到这些线程的启动情况，初始启动 8个 DBWR，stats 线程是 Oracle 没有的：
UTC+8 2019-12-09 11:07:21.193|ZENGINE|00000|206158446822|INFO>starting instance(normal)
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16616|INFO>lgwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16617|INFO>dbwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16618|INFO>dbwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16619|INFO>dbwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16620|INFO>dbwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16621|INFO>dbwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16622|INFO>dbwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16623|INFO>dbwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16624|INFO>dbwr thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16625|INFO>ckpt thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16626|INFO>smon thread started
UTC+8 2019-12-09 11:07:21.242|ZENGINE|00000|16627|INFO>stats thread started
待补充。。。
