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| <h1 class="page">When to use an index</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Built-in indexes are best on a table having many rows that contain the indexed value. |
| The more unique values that exist in a particular column, the more overhead on average is required to query and maintain the index. |
| For example, suppose you had a races table with a billion entries for cyclists in hundreds of races and wanted to look up rank by the cyclist. |
| Many cyclists' ranks will share the same column value for race year. |
| The <code>race_year</code> column is a good candidate for an index.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If secondary indexes are required, based on one or more table columns other than its partition key, use Storage-Attached Indexing (SAI). |
| For details, see <a href="../../../../reference/cql-commands/create-custom-index.html" class="page">CREATE CUSTOM INDEX</a>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="when-no-index"><a class="anchor" href="#when-no-index"></a>When <em>not</em> to use an index</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Do not use an index in these situations:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>On high-cardinality columns for a query of a huge volume of records for a small number of results. |
| See <a href="#highCardCol">Problems using a high-cardinality column index</a> below.</p> |
| </li> |
| <li> |
| <p>In tables that use a counter column.</p> |
| </li> |
| <li> |
| <p>On a frequently updated or deleted column. |
| See <a href="#upDatIndx">Problems using an index on a frequently updated or deleted column</a> below.</p> |
| </li> |
| <li> |
| <p>To look for a row in a large partition unless narrowly queried. |
| See <a href="#largCluster">Problems using an index to look for a row in a large partition unless narrowly queried</a> below.</p> |
| </li> |
| <li> |
| <p>Do not add a secondary index and a search index to the same table.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="sect2"> |
| <h3 id="highCardCol"><a class="anchor" href="#highCardCol"></a>Problems using a high-cardinality column index</h3> |
| <div class="paragraph"> |
| <p>If you create an index on a high-cardinality column, which has many distinct values, a query between the fields incurs many seeks for very few results. |
| In the table with a billion songs, looking up songs by writer (a value that is typically unique for each song) instead of by their recording artist is likely to be very inefficient.</p> |
| </div> |
| <div class="paragraph"> |
| <p>It would probably be more efficient to manually maintain the table as a form of an index instead of using the built-in index. |
| For columns containing unique data, it is sometimes better for performance to use an index for convenience, as long as the query volume to the table having an indexed column is moderate and not under constant load.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Conversely, creating an index on an extremely low-cardinality column, such as a boolean column, does not make sense. |
| Each value in the index becomes a single row in the index, resulting in a huge row for all the false values, for example. |
| Indexing a multitude of indexed columns having foo = true and foo = false is not useful.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="upDatIndx"><a class="anchor" href="#upDatIndx"></a>Problems using an index on a frequently updated or deleted column</h3> |
| <div class="paragraph"> |
| <p>The database stores tombstones in the index until the tombstone limit reaches 100K cells. |
| After exceeding the tombstone limit, the query that uses the indexed value will fail.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="largCluster"><a class="anchor" href="#largCluster"></a>Problems using an index to look for a row in a large partition unless narrowly queried</h3> |
| <div class="paragraph"> |
| <p>A query on an indexed column in a large cluster typically requires collating responses from multiple data partitions. |
| The query response slows down as more machines are added to the cluster. |
| When looking for a row in a large partition, narrow the search to avoid query performance degradation.</p> |
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