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| <p>You are viewing the documentation for a prerelease version.</p> |
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| <article class="doc"> |
| <h1 class="page">CREATE INDEX</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Define a new index on a single column of a table. |
| If the column already contains data, it is indexed during the execution of this statement. |
| After an index has been created, it is automatically updated when data in the column changes. |
| Apache Cassandra supports creating an index on most columns, including the partition and cluster columns of a PRIMARY KEY, collections, and static columns. |
| Indexing via this <code>CREATE INDEX</code> command can impact performance. |
| Before creating an index, be aware of when and <a href="indexing/2i/2i-when-to-use.html#when-no-index" class="page">when not to create an index</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Use <a href="#cassandra:developing/cql/indexing/create-custom-index.adoc" class="page unresolved">CREATE CUSTOM INDEX</a> for Storage-Attached Indexes (SAI).</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>Restriction:</strong> Indexing counter columns is not supported. |
| For maps, index the key, value, or entries.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="synopsis"><a class="anchor" href="#synopsis"></a>Synopsis</h2> |
| <div class="sectionbody"> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>CREATE INDEX [ IF NOT EXISTS ] <index_name> |
| ON [<keyspace_name>.]<table_name> |
| ([ ( KEYS | FULL ) ] <column_name>) |
| (ENTRIES <column_name>) ;</pre> |
| </div> |
| </div> |
| <div class="exampleblock"> |
| <div class="title">Syntax legend</div> |
| <div class="content"> |
| <div class="paragraph"> |
| <p>include:cassandra:partial$cql-syntax-legend.adoc[]</p> |
| </div> |
| </div> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>index_name</strong></dt> |
| <dd> |
| <p>Optional identifier for index. |
| If no name is specified, DataStax Enterprise |
| names the index: <code><table_name>_<column_name>_idx</code>. |
| Enclose in quotes to use special characters or preserve capitalization.</p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="examples"><a class="anchor" href="#examples"></a>Examples</h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="creating-an-index-on-a-clustering-column"><a class="anchor" href="#creating-an-index-on-a-clustering-column"></a>Creating an index on a clustering column</h3> |
| <div class="paragraph"> |
| <p>Define a table having a <a href="../../reference/cql-commands/create-table.html#cqlPKcomposite" class="page">composite partition key</a>, and then create an index on a clustering column.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.rank_by_year_and_name ( |
| race_year int, |
| race_name text, |
| cyclist_name text, |
| rank int, |
| PRIMARY KEY ((race_year, race_name), rank) |
| );</code></pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE INDEX IF NOT EXISTS rank_idx |
| ON cycling.rank_by_year_and_name (rank);</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="creating-an-index-on-a-set-or-list-collection"><a class="anchor" href="#creating-an-index-on-a-set-or-list-collection"></a>Creating an index on a set or list collection</h3> |
| <div class="paragraph"> |
| <p>Create an index on a set or list collection column as you would any other column. |
| Enclose the name of the collection column in parentheses at the end of the <code>CREATE INDEX</code> statement. |
| For example, add a collection of teams to the <code>cyclist_career_teams</code> table to index the data in the teams set.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.cyclist_career_teams ( |
| id UUID PRIMARY KEY, |
| lastname text, |
| teams set<text> |
| );</code></pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE INDEX IF NOT EXISTS teams_idx |
| ON cycling.cyclist_career_teams (teams);</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="CreatIdxCollKey"><a class="anchor" href="#CreatIdxCollKey"></a>Creating an index on map keys</h3> |
| <div class="paragraph"> |
| <p>You can create an index on <a href="#cassandra:developingindexing/2i/2i-create-on-collection.adoc" class="page unresolved">map collection keys</a>. |
| If an index of the map values of the collection exists, drop that index before creating an index on the map collection keys. |
| Assume a cyclist table contains this map data:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-no-highlight hljs" data-lang="no-highlight">{'nation':'CANADA' }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The map key is located to the left of the colon, and the map value is located to the right of the colon.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To index map keys, use the <code>KEYS</code> keyword and map name in nested parentheses:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE INDEX IF NOT EXISTS team_year_keys_idx |
| ON cycling.cyclist_teams ( KEYS (teams) );</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To query the table, you can use <a href="#cassandra:reference/cql-commands/select.adoc#filtering-on-collections" class="page unresolved">CONTAINS KEY</a> in <code>WHERE</code> clauses.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">SELECT * |
| FROM cycling.cyclist_teams |
| WHERE teams CONTAINS KEY 2015;</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The example returns cyclist teams that have an entry for the year 2015.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-results hljs" data-lang="results"> id | firstname | lastname | teams |
| --------------------------------------+-----------+------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| cb07baad-eac8-4f65-b28a-bddc06a0de23 | Elizabeth | ARMITSTEAD | {2011: 'Team Garmin - Cervelo', 2012: 'AA Drink - Leontien.nl', 2013: 'Boels:Dolmans Cycling Team', 2014: 'Boels:Dolmans Cycling Team', 2015: 'Boels:Dolmans Cycling Team'} |
| 5b6962dd-3f90-4c93-8f61-eabfa4a803e2 | Marianne | VOS | {2015: 'Rabobank-Liv Woman Cycling Team'} |
| |
| (2 rows)</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="creating-an-index-on-map-entries"><a class="anchor" href="#creating-an-index-on-map-entries"></a>Creating an index on map entries</h3> |
| <div class="paragraph"> |
| <p>You can create an index on map entries. |
| An <code>ENTRIES</code> index can be created only on a map column of a table that doesn’t have an existing index.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To index collection entries, use the <code>ENTRIES</code> keyword and map name in nested parentheses:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE INDEX IF NOT EXISTS blist_idx |
| ON cycling.birthday_list ( ENTRIES(blist) ); |
| ----</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To query the map entries in the table, use a <code>WHERE</code> clause with the map name and a value.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">SELECT * |
| FROM cycling.birthday_list |
| WHERE blist[ 'age' ] = '23';</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The example finds cyclists who are the same age.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-results hljs" data-lang="results"> cyclist_name | blist |
| ------------------+---------------------------------------------------------- |
| Claudio HEINEN | {'age': '23', 'bday': '27/07/1992', 'nation': 'GERMANY'} |
| Laurence BOURQUE | {'age': '23', 'bday': '27/07/1992', 'nation': 'CANADA'} |
| |
| (2 rows)</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Use the same index to find cyclists from the same country.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>SELECT * |
| FROM cycling.birthday_list |
| WHERE blist[ 'nation' ] = 'NETHERLANDS';</pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-results hljs" data-lang="results"> cyclist_name | blist |
| ---------------+-------------------------------------------------------------- |
| Luc HAGENAARS | {'age': '28', 'bday': '27/07/1987', 'nation': 'NETHERLANDS'} |
| Toine POELS | {'age': '52', 'bday': '27/07/1963', 'nation': 'NETHERLANDS'} |
| |
| (2 rows)</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="creating-an-index-on-map-values"><a class="anchor" href="#creating-an-index-on-map-values"></a>Creating an index on map values</h3> |
| <div class="paragraph"> |
| <p>To create an index on map values, use the <code>VALUES</code> keyword and map name in nested parentheses:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>CREATE INDEX IF NOT EXISTS blist_values_idx |
| ON cycling.birthday_list ( VALUES(blist) );</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To query the table, use a <code>WHERE</code> clause with the map name and the value it contains.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>SELECT * |
| FROM cycling.birthday_list |
| WHERE blist CONTAINS 'NETHERLANDS';</pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-results hljs" data-lang="results"> cyclist_name | blist |
| ---------------+-------------------------------------------------------------- |
| Luc HAGENAARS | {'age': '28', 'bday': '27/07/1987', 'nation': 'NETHERLANDS'} |
| Toine POELS | {'age': '52', 'bday': '27/07/1963', 'nation': 'NETHERLANDS'} |
| |
| (2 rows)</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="creating-an-index-on-the-full-content-of-a-frozen-collection"><a class="anchor" href="#creating-an-index-on-the-full-content-of-a-frozen-collection"></a>Creating an index on the full content of a frozen collection</h3> |
| <div class="paragraph"> |
| <p>You can create an index on a full <code>FROZEN</code> collection. |
| A <code>FULL</code> index can be created on a set, list, or map column of a table that doesn’t have an existing index.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Create an index on the full content of a <code>FROZEN</code> <code>list</code>. |
| The table in this example stores the number of Pro wins, Grand Tour races, and Classic races that a cyclist has competed in.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE TABLE IF NOT EXISTS cycling.race_starts ( |
| cyclist_name text PRIMARY KEY, |
| rnumbers FROZEN<LIST<int>> |
| );</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To index collection entries, use the <code>FULL</code> keyword and collection name in nested parentheses. |
| For example, index the frozen list <code>rnumbers</code>.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">CREATE INDEX IF NOT EXISTS rnumbers_idx |
| ON cycling.race_starts ( FULL(rnumbers) );</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To query the table, use a <code>WHERE</code> clause with the collection name and values:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-language-cql hljs" data-lang="language-cql">SELECT * |
| FROM cycling.race_starts |
| WHERE rnumbers = [39, 7, 14];</code></pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-results hljs" data-lang="results"> cyclist_name | rnumbers |
| ----------------+------------- |
| John DEGENKOLB | [39, 7, 14] |
| |
| (1 rows)</code></pre> |
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