filter: '{ op: "query", millis: { $gt: 2000 } }' replication 选项 replication: oplogSizeMB: <int> replSetName: <string> enableMajorityReadConcern: <boolean> replication.oplogSizeMB 类型:整型 oplog 的最大大小(以兆字节为单位)。oplogSizeMB 设置将配置 oplog 的未压缩大小,而不是磁盘上的大小...
How to make toMany backlink relationships with IQueryable collections also work with xaml binding dot-net 1108September 6, 2024 Query filter using two fields in a `LinkingObjects` swift 13362September 5, 2024 Changes made inside a Atlas function are reflected very slow in Realm ...
$lookup(Aggregation) creates an outer left join with another collection and helps to filter data from merged data. If documents are part of a “joined” collection, the $lookup (Aggregation) function will return documents as a subarray of the original collection. Syntax In MongoDB’s JOIN oper...
Filtering with $and for Multiple Fields While the$oroperator is great for matching any of several conditions, the$andoperator is useful when you want to ensure that multiple conditions are met simultaneously. This operator allows you to filter documents based on multiple criteria across different fie...
You can cut down on the penalty by using other query filters in combination with "$where". If possible, an index will be used to filter based on the non-$where clauses; the "$where" expression will be used only to fine-tune the results. Another way of doing complex queries is to ...
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Optimization of oplog.rs query. The current query was too complex and not efficient in MongoDB. oplog.rs query now uses only $ts filter. Newoptions/import_all_collectionsparameter can be used to import all collection of a database (see issue#177) ...
You use theensureIndexfunction to add an index to your collection. Indexed fields are tracked in memory and can be retrieved much more rapidly by MongoDB. More importantly, they act as a filter on queried data; the database only needs to look at records that it knows match your search cri...
arrayFilter 数组中的顶级字段不能重复,如下:出现了两个 idx0,运行报错index 0: 9 - Found multiple array filters with the same top-level field name idx0 db.nestedUpdate.updateMany({}, {$set: { 'arr_1.$[idx0].c.$[idx1]': 1}
();for(Map.Entry<String,Object>entry:filterMap.entrySet()){filters.add(Filters.eq(entry.getKey(),entry.getValue()));}// 删除条件Bson filter=Filters.and(filters);// 批量删除DeleteResult deleteResult=collection.deleteMany(filter);log.info("Deleted "+deleteResult.getDeletedCount()+" documents")...