本教程是DBA高级主题的延续。在本文中，我们将分享如何执行最常见活动的最佳实践和技巧。在本教程中，我们将介绍MongoDB切分。
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7 . PRIMARY Secondary Secondary
8 .Secondaries - Pull oplog and apply locally
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10 . Chained replication Secondaries - Pull oplog and apply locally
11 .Delayed Secondary Secondaries - Pull oplog and apply locally
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17 . Config Servers mongos Shard1 Shard2
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19 . shard1 shard2 A database can have multiple collections, each collection can be sharded differently. Each shard has chunks and their documents.
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28 . Config Servers mongos Shard1 Shard2
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