{"id":9773,"date":"2021-08-12T00:00:28","date_gmt":"2021-08-12T07:00:28","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=9773"},"modified":"2025-06-13T19:27:01","modified_gmt":"2025-06-14T02:27:01","slug":"indexing-service-optimizations-with-couchbase-collections","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/indexing-service-optimizations-with-couchbase-collections\/","title":{"rendered":"Here’s How the Index Service Got Upgraded for Couchbase 7.0"},"content":{"rendered":"

Index builds and updates just got a big performance upgrade<\/strong> with the introduction of Scopes and Collections in Couchbase 7.<\/p>\n

The Couchbase Server 7.0 release<\/a> introduces the separation of Bucket data into logical Scopes and Collections<\/a> on top of the JSON document database. This separation lets you organize your data into different schemas and tables \u2013 concepts most RDBMS users are already familiar with. In addition, Scopes and Collections enable finer role-based access control<\/a> to the data you’ve stored in Couchbase. <\/p>\n

Note:<\/em> The introduction of Scopes and Collections doesn’t mean that data of a specific `type` has to be separated and stored in its own Collection. It’s actually the opposite: a Collection is first and foremost a collection of JSON documents<\/a>, and as such, you retain all the flexibility of a schema-less database. Or, rather, you<\/em> create the schema your application demands.<\/p>\n

With these Index Service optimizations, you might decide to migrate from the Bucket model to the new Collections model \u2013 or you might already have a well-configured Couchbase<\/a> cluster. In this article, I’ll show you a few ways that the Index Service has been optimized to help you decide what’s best for your deployment. Let’s dive in.<\/p>\n

The Index Pipeline for the Bucket Model<\/h2>\n

The diagram below shows the index build pipeline under the Couchbase Bucket model.<\/p>\n

<\/div>\n

\"The<\/p>\n

<\/div>\n
    \n
  1. The projector process in the Data Service is solely responsible for streaming the Bucket data to the Indexing Service.<\/li>\n
  2. The projector uses a single Database Change Protocol (DCP) stream to evaluate all mutations to determine if a document should be streamed to the Index Service, based on the index metadata. <\/li>\n
  3. The projector streams only the specific columns that the Index Service maintains for its indexes.<\/li>\n<\/ol>\n
    <\/div>\n

    If it wasn’t clear in the above diagram, the projector has to consider all<\/em> Bucket mutations for all<\/em> of the indexes in the cluster. <\/p>\n

    The Index Pipeline for the Collection Model<\/h2>\n

    In the new Collection model of Couchbase 7.0, DCP streaming between the Data and Index Service is at the Collection level. While this change implies more DCP streams, it actually benefits downstream processing when the projector decides which Index Service it will send the mutations to.<\/p>\n

    There is a small difference on how this works for the initial index build vs. the index updates. First, let’s look at the initial index build process under the new Collections model.<\/p>\n

    <\/div>\n

    \"Optimization<\/p>\n

    <\/div>\n
      \n
    1. Indexes are created on a per-Collection basis.<\/li>\n
    2. A DCP stream is created for each Collection during the initial index build, resulting in a smaller workload for the projector.<\/li>\n
    3. The projector no longer needs to evaluate the index `WHERE` clause to determine if a mutation qualifies for the index.<\/li>\n<\/ol>\n
      <\/div>\n

      Now let’s take a look at the new index update process in Couchbase 7.0:<\/p>\n

      <\/div>\n

      \"The<\/p>\n

      <\/div>\n
        \n
      1. The DCP stream data is now prefixed with `collection id` so the projector knows which index to send the change to.<\/li>\n
      2. The projector no longer needs to evaluate the index `WHERE` clause.<\/li>\n
      3. The index ingestion check is limited to indexes defined on the updated document\u2019s Collection, instead of all indexes in the Bucket. This limitation results in significant savings in terms of CPU and disk I\/O<\/li>\n<\/ol>\n
        <\/div>\n

        Conclusion<\/h2>\n

        From a configuration standpoint, the introduction of Couchbase Collections doesn’t require you to change anything for the Index Service. However, you do need to specify the Collection name \u2013 instead of just the Bucket name \u2013 when creating indexes on a specific Collection. <\/p>\n

        The 7.0 release implemented these changes to give you the advantage of working with smaller datasets instead of handling mutations across an entire Bucket. This small-data benefit permeates all the stages of the Index Service \u2013 from the projector through the indexer to the downstream storage layer. <\/p>\n

        If you want to learn more about the Couchbase Server 7.0 release, check out What’s New<\/a> and\/or the 7.0 release notes<\/a>.<\/p>\n

        <\/div>\n
        Give the new Index Service a test drive with your<\/em> dataset:
        \n        Try out Couchbase 7.0 today<\/a><\/strong><\/div>\n
        <\/div>\n

         
        \n 
        \n <\/p>\n","protected":false},"excerpt":{"rendered":"

        Index builds and updates just got a big performance upgrade with the introduction of Scopes and Collections in Couchbase 7. The Couchbase Server 7.0 release introduces the separation of Bucket data into logical Scopes and Collections on top of the […]<\/p>\n","protected":false},"author":26326,"featured_media":11692,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1821,8905,1816,9336],"tags":[1580,1977,1976,2312,1696,1261,1385],"ppma_author":[8919],"class_list":["post-9773","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-couchbase-architecture","category-couchbase-global-secondary-index","category-couchbase-server","category-scopes-and-collections","tag-data-service","tag-database-change-protocol","tag-dcp","tag-document-database","tag-indexing","tag-json","tag-rdbms"],"acf":[],"yoast_head":"\nHere's How the Index Service Got Upgraded for Couchbase 7.0<\/title>\n<meta name=\"description\" content=\"Discover how the introduction of 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