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                * Write Concern(寫關注),簡稱MongoDB寫入安全機制 * 是一種客戶端設置,用于控制寫入安全的級別。 * 描述了MongoDB寫入到mongod單實例,副本集,以及分片集群時何時應答給客戶端。 ```js 寫關注用法: 參數:{ w: <value>, j: <boolean>, wtimeout: <number> } 示例: db.blogs.insert({name:"kgc"},{writeConcern:{w:0}}) ```
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