# MongoDB教育訓練-20211223-01

Hideden Replica Set Member 隱藏結點，不太使用（歷史，所有請求不會訪問）

Delayed Replica Set Member 不太使用，先將資料取回不同步(延遲一段時間，保持舊資料，備援用)

[![image-1640224635457.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/XOGkmJFnD85OvMkq-image-1640224635457.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/XOGkmJFnD85OvMkq-image-1640224635457.png)

[![image-1640229898504.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/W9QymtxKIAMTIkvu-image-1640229898504.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/W9QymtxKIAMTIkvu-image-1640229898504.png)

- 如何知道主結點？ Driver 告訴你
- Driver 幫你追蹤網路架構，不需知道主從節點
- 為截點點打上標籤，通過driver，告訴你

[![image-1640225138949.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/mkaD8FGMUONjNWvt-image-1640225138949.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/mkaD8FGMUONjNWvt-image-1640225138949.png)

Driver 版本匹配

[![image-1640225409514.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/XUV6UBCZHoCy7WiL-image-1640225409514.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/XUV6UBCZHoCy7WiL-image-1640225409514.png)

[![image-1640225581875.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/ljScMKeKsnerrfZT-image-1640225581875.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/ljScMKeKsnerrfZT-image-1640225581875.png)

[![image-1640225640585.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/kjE3XuBBGE2pWXg7-image-1640225640585.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/kjE3XuBBGE2pWXg7-image-1640225640585.png)

[![image-1640225672880.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/K36gksltsXNU7Sp1-image-1640225672880.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/K36gksltsXNU7Sp1-image-1640225672880.png)

Oplog 會紀錄所有變更，增刪改查

[![image-1640225826529.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/VkuI6ZzjAZYi0Qy0-image-1640225826529.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/VkuI6ZzjAZYi0Qy0-image-1640225826529.png)

[![image-1640226097101.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/uoM1F32LgN72bL9r-image-1640226097101.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/uoM1F32LgN72bL9r-image-1640226097101.png)

[![image-1640226197262.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/MXHz4iiUS9dvzxIq-image-1640226197262.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/MXHz4iiUS9dvzxIq-image-1640226197262.png)

[![image-1640226289283.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/rFNNUT6zOP9kDniK-image-1640226289283.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/rFNNUT6zOP9kDniK-image-1640226289283.png)

節點從最近節點複製

[![image-1640226546216.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/xt0a7FrsUW8oVGJh-image-1640226546216.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/xt0a7FrsUW8oVGJh-image-1640226546216.png)

我們可以直接連線至從節點

[![image-1640226730042.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/6U4q1S3mIsM220jG-image-1640226730042.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/6U4q1S3mIsM220jG-image-1640226730042.png)

[![image-1640226806230.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/ukiGN9JWAOhYyvMD-image-1640226806230.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/ukiGN9JWAOhYyvMD-image-1640226806230.png)

[![image-1640226630457.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/AVf1EvlPoUtMYUx5-image-1640226630457.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/AVf1EvlPoUtMYUx5-image-1640226630457.png)

從節點查詢資料會出現告警，需下以下指令

db.getMongo().setReadPref("secondaryPreferred")

[![image-1640227049033.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/RBSiuFMGfU7k2rjQ-image-1640227049033.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/RBSiuFMGfU7k2rjQ-image-1640227049033.png)

[![image-1640227181462.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/UJowcNEosUMKYFZI-image-1640227181462.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/UJowcNEosUMKYFZI-image-1640227181462.png)

[![image-1640228152411.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/leh8xE0qxe8pz8C6-image-1640228152411.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/leh8xE0qxe8pz8C6-image-1640228152411.png)

[![image-1640228847213.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/CdrXbc5ZKv9PmB5a-image-1640228847213.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/CdrXbc5ZKv9PmB5a-image-1640228847213.png)

[![image-1640229625178.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/joQKDZO1k9gti5tX-image-1640229625178.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/joQKDZO1k9gti5tX-image-1640229625178.png)

[![image-1640229774613.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/Te9XUXyWYniIPvDR-image-1640229774613.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/Te9XUXyWYniIPvDR-image-1640229774613.png)

[![image-1640229875125.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/LnCVMxTrZg0zSxNT-image-1640229875125.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/LnCVMxTrZg0zSxNT-image-1640229875125.png)

總節點是奇數個才能選出主節點，剩下最新的會變成主節點

[![image-1640229994266.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/01gyMSjgcs4D3EFd-image-1640229994266.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/01gyMSjgcs4D3EFd-image-1640229994266.png)

網路斷開主節點還是存在

[![image-1640230063320.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/otVqDPjheDK2ZNF7-image-1640230063320.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/otVqDPjheDK2ZNF7-image-1640230063320.png)

需要有大多數才能投票，此主節點失效

[![image-1640230096608.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/GWTdbxzxI27wdAxk-image-1640230096608.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/GWTdbxzxI27wdAxk-image-1640230096608.png)

會可以投票主節點，DC1有機會成為主節點(資料較新？)

[![image-1640230277213.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/Wlcc8tGbUqUerXZc-image-1640230277213.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/Wlcc8tGbUqUerXZc-image-1640230277213.png)

[![image-1640230905006.png](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/scaled-1680-/m9u6CRTUvwLEjSbz-image-1640230905006.png)](https://bookstack.treemanou.com/uploads/images/gallery/2021-12/m9u6CRTUvwLEjSbz-image-1640230905006.png)