Amazon web services 当页面之间的日期发生变化时，分页的DynamoDB查询的行为如何？

我正在使用DynamoDBMapper对DynamoDB进行分页查询。该查询基于某个本地二级索引（

索引

字段），如果某个条目被标记为已删除并带有时间戳，则该索引将组合信息。假设我有以下数据：

{..., creationTime: 1000, isDeleted: false, index=F:1000}
{..., creationTime: 1001, isDeleted: false, index=F:1001}
{..., creationTime: 1002, isDeleted: false, index=F:1002}
{..., creationTime: 1003, isDeleted: false, index=F:1003}

现在，我在结果的第一页进行查询并得到两个条目：

{..., creationTime: 1000, isDeleted: false, index=F:1000}
{..., creationTime: 1001, isDeleted: false, index=F:1001}

{..., creationTime: 1002, isDeleted: false, index=F:1002}
{..., creationTime: 1003, isDeleted: false, index=F:1003}

我查询第二页，应该得到剩下的两个条目：

{..., creationTime: 1000, isDeleted: false, index=F:1000}
{..., creationTime: 1001, isDeleted: false, index=F:1001}

{..., creationTime: 1002, isDeleted: false, index=F:1002}
{..., creationTime: 1003, isDeleted: false, index=F:1003}

但是如果在页面之间第三个条目被标记为已删除呢

{..., creationTime: 1002, isDeleted: true, index=D:1002} << changed !

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{…，creationTime:1002，isDeleted:true，index=D:1002}dynamodb按范围键对结果排序。
在本例中，范围键（索引）是字符串，因此顺序将根据其字符串值确定

请求页面时，需要提供最后一个经过计算的键（最后一个范围键然后从上一页返回）

通过这个“最后评估的键”，dynamodb知道返回哪个页面

让我们以你为例

您的范围键的格式为“F/D:”

“F”的字符串值始终大于“D”

因此，如果任何“F”记录将更改为“D”，那么它将永远不会在下一页返回（如果您到达的页面的索引以“F”开头）（除非更改顺序（ASC/DESC），但这不是您的情况）

所以我们假设索引如下所示：

{..., creationTime: 1000, isDeleted: false, index=D:1000}
{..., creationTime: 1000, isDeleted: false, index=F:1000}
{..., creationTime: 1001, isDeleted: false, index=F:1001}
{..., creationTime: 1002, isDeleted: false, index=F:1002}
{..., creationTime: 1002, isDeleted: false, index=F:1003}

{..., creationTime: 1000, isDeleted: false, index=D:1000}
{..., creationTime: 1002, isDeleted: true, index=D:1002}
{..., creationTime: 1000, isDeleted: false, index=F:1000}
{..., creationTime: 1001, isDeleted: false, index=F:1001}
{..., creationTime: 1002, isDeleted: false, index=F:1003}

如果您的第一页是：

{..., creationTime: 1000, isDeleted: false, index=D:1000}
{..., creationTime: 1000, isDeleted: false, index=F:1000}
{..., creationTime: 1001, isDeleted: false, index=F:1001}

及

更改为“已删除”，则您的下一页将是：

{..., creationTime: 1002, isDeleted: false, index=F:1003}

因为现在你的索引是这样的：

{..., creationTime: 1000, isDeleted: false, index=D:1000}
{..., creationTime: 1000, isDeleted: false, index=F:1000}
{..., creationTime: 1001, isDeleted: false, index=F:1001}
{..., creationTime: 1002, isDeleted: false, index=F:1002}
{..., creationTime: 1002, isDeleted: false, index=F:1003}

{..., creationTime: 1000, isDeleted: false, index=D:1000}
{..., creationTime: 1002, isDeleted: true, index=D:1002}
{..., creationTime: 1000, isDeleted: false, index=F:1000}
{..., creationTime: 1001, isDeleted: false, index=F:1001}
{..., creationTime: 1002, isDeleted: false, index=F:1003}

这取决于你的指数。你能描述一下你的本地二级索引吗？已编辑<代码>索引

字段用作范围键