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| <p>You are viewing the documentation for a prerelease version.</p> |
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| <ul> |
| <li class="crumb"><a href="../../../index.html">Cassandra</a></li> |
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| <article class="doc"> |
| <h1 class="page">Secondary Indexes</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>CQL supports creating secondary indexes on tables, allowing queries on |
| the table to use those indexes. A secondary index is identified by a |
| name defined by:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-bnf hljs" data-lang="bnf">index_name::= re('[a-zA-Z_0-9]+')</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="create-index-statement"><a class="anchor" href="#create-index-statement"></a>CREATE INDEX</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The <code>CREATE INDEX</code> statement is used to create a new |
| secondary index for a given (existing) column in a given table. A name |
| for the index itself can be specified before the <code>ON</code> keyword, if |
| desired.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-bnf hljs" data-lang="bnf">create_index_statement::= CREATE [ CUSTOM ] INDEX [ IF NOT EXISTS ] [ index_name ] |
| ON table_name '(' index_identifier ')' |
| [ USING index_type [ WITH OPTIONS = map_literal ] ] |
| index_identifier::= column_name |
| | ( KEYS | VALUES | ENTRIES | FULL ) '(' column_name ')' |
| index_type::= 'sai' | 'legacy_local_table' | fully_qualified_class_name</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>If data already exists for the column, it will be indexed |
| asynchronously. After the index is created, new data for the column is |
| indexed automatically at insertion time. Attempting to create an already |
| existing index will return an error unless the <code>IF NOT EXISTS</code> option is used. |
| If it is used, the statement will be a no-op if the index already exists.</p> |
| </div> |
| <div class="paragraph"> |
| <p><strong>Examples</strong>:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-cql hljs" data-lang="cql">CREATE INDEX userIndex ON NerdMovies (user); |
| CREATE INDEX ON Mutants (abilityId); |
| CREATE INDEX ON users (KEYS(favs)); |
| CREATE INDEX ON users (age) USING 'sai'; |
| CREATE CUSTOM INDEX ON users (email) |
| USING 'path.to.the.IndexClass'; |
| CREATE CUSTOM INDEX ON users (email) |
| USING 'path.to.the.IndexClass' |
| WITH OPTIONS = {'storage': '/mnt/ssd/indexes/'};</code></pre> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="index-types"><a class="anchor" href="#index-types"></a>Index Types</h3> |
| <div class="paragraph"> |
| <p>The <code>USING</code> keyword optionally specifies an index type. There are two built-in types:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>legacy_local_table - (default) legacy secondary index, implemented as a hidden local table</p> |
| </li> |
| <li> |
| <p>sai - "storage-attched" index, implemented via optimized SSTable/Memtable-attached indexes</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>To create a custom index, a fully qualified class name must be specified.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="indexes-on-map-keys"><a class="anchor" href="#indexes-on-map-keys"></a>Indexes on Map Keys</h3> |
| <div class="paragraph"> |
| <p>When creating an index on a <code>maps <maps></code>, you may index either the keys |
| or the values. If the column identifier is placed within the <code>keys()</code> |
| function, the index will be on the map keys, allowing you to use |
| <code>CONTAINS KEY</code> in <code>WHERE</code> clauses. Otherwise, the index will be on the |
| map values.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="drop-index-statement"><a class="anchor" href="#drop-index-statement"></a>DROP INDEX</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Dropping a secondary index uses the <code>DROP INDEX</code> statement:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-bnf hljs" data-lang="bnf">drop_index_statement::= DROP INDEX [ IF EXISTS ] index_name</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>DROP INDEX</code> statement is used to drop an existing secondary index. |
| The argument of the statement is the index name, which may optionally |
| specify the keyspace of the index.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If the index does not exists, the statement will return an error, unless |
| <code>IF EXISTS</code> is used in which case the operation is a no-op.</p> |
| </div> |
| </div> |
| </div> |
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