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| <h1 class="title">ALTER DATABASE</h1> |
| |
| |
| <h3 id="description">Description</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER DATABASE</code> statement changes the properties or location of a database. Please note that the usage of |
| <code class="language-plaintext highlighter-rouge">DATABASE</code>, <code class="language-plaintext highlighter-rouge">SCHEMA</code> and <code class="language-plaintext highlighter-rouge">NAMESPACE</code> are interchangeable and one can be used in place of the others. An error message |
| is issued if the database is not found in the system.</p> |
| |
| <h3 id="alter-properties">ALTER PROPERTIES</h3> |
| <p><code class="language-plaintext highlighter-rouge">ALTER DATABASE SET DBPROPERTIES</code> statement changes the properties associated with a database. |
| The specified property values override any existing value with the same property name. |
| This command is mostly used to record the metadata for a database and may be used for auditing purposes.</p> |
| |
| <h4 id="syntax">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="err">{</span> <span class="k">DATABASE</span> <span class="o">|</span> <span class="k">SCHEMA</span> <span class="o">|</span> <span class="n">NAMESPACE</span> <span class="err">}</span> <span class="n">database_name</span> |
| <span class="k">SET</span> <span class="err">{</span> <span class="n">DBPROPERTIES</span> <span class="o">|</span> <span class="n">PROPERTIES</span> <span class="err">}</span> <span class="p">(</span> <span class="n">property_name</span> <span class="o">=</span> <span class="n">property_value</span> <span class="p">[</span> <span class="p">,</span> <span class="p">...</span> <span class="p">]</span> <span class="p">)</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>database_name</strong></p> |
| |
| <p>Specifies the name of the database to be altered.</p> |
| </li> |
| </ul> |
| |
| <h3 id="alter-location">ALTER LOCATION</h3> |
| <p><code class="language-plaintext highlighter-rouge">ALTER DATABASE SET LOCATION</code> statement changes the default parent-directory where new tables will be added |
| for a database. Please note that it does not move the contents of the database’s current directory to the newly |
| specified location or change the locations associated with any tables/partitions under the specified database |
| (available since Spark 3.0.0 with the Hive metastore version 3.0.0 and later).</p> |
| |
| <h4 id="syntax-1">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="err">{</span> <span class="k">DATABASE</span> <span class="o">|</span> <span class="k">SCHEMA</span> <span class="o">|</span> <span class="n">NAMESPACE</span> <span class="err">}</span> <span class="n">database_name</span> |
| <span class="k">SET</span> <span class="k">LOCATION</span> <span class="s1">'new_location'</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters-1">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>database_name</strong></p> |
| |
| <p>Specifies the name of the database to be altered.</p> |
| </li> |
| </ul> |
| |
| <h3 id="examples">Examples</h3> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">-- Creates a database named `inventory`.</span> |
| <span class="k">CREATE</span> <span class="k">DATABASE</span> <span class="n">inventory</span><span class="p">;</span> |
| |
| <span class="c1">-- Alters the database to set properties `Edited-by` and `Edit-date`.</span> |
| <span class="k">ALTER</span> <span class="k">DATABASE</span> <span class="n">inventory</span> <span class="k">SET</span> <span class="n">DBPROPERTIES</span> <span class="p">(</span><span class="s1">'Edited-by'</span> <span class="o">=</span> <span class="s1">'John'</span><span class="p">,</span> <span class="s1">'Edit-date'</span> <span class="o">=</span> <span class="s1">'01/01/2001'</span><span class="p">);</span> |
| |
| <span class="c1">-- Verify that properties are set.</span> |
| <span class="k">DESCRIBE</span> <span class="k">DATABASE</span> <span class="n">EXTENDED</span> <span class="n">inventory</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-------------------------+------------------------------------------+</span> |
| <span class="o">|</span><span class="n">database_description_item</span><span class="o">|</span> <span class="n">database_description_value</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-------------------------+------------------------------------------+</span> |
| <span class="o">|</span> <span class="k">Database</span> <span class="n">Name</span><span class="o">|</span> <span class="n">inventory</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">Description</span><span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="k">Location</span><span class="o">|</span> <span class="n">file</span><span class="p">:</span><span class="o">/</span><span class="k">temp</span><span class="o">/</span><span class="n">spark</span><span class="o">-</span><span class="n">warehouse</span><span class="o">/</span><span class="n">inventory</span><span class="p">.</span><span class="n">db</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">Properties</span><span class="o">|</span><span class="p">((</span><span class="n">Edit</span><span class="o">-</span><span class="nb">date</span><span class="p">,</span><span class="mi">01</span><span class="o">/</span><span class="mi">01</span><span class="o">/</span><span class="mi">2001</span><span class="p">),</span> <span class="p">(</span><span class="n">Edited</span><span class="o">-</span><span class="k">by</span><span class="p">,</span><span class="n">John</span><span class="p">))</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-------------------------+------------------------------------------+</span> |
| |
| <span class="c1">-- Alters the database to set a new location.</span> |
| <span class="k">ALTER</span> <span class="k">DATABASE</span> <span class="n">inventory</span> <span class="k">SET</span> <span class="k">LOCATION</span> <span class="s1">'file:/temp/spark-warehouse/new_inventory.db'</span><span class="p">;</span> |
| |
| <span class="c1">-- Verify that a new location is set.</span> |
| <span class="k">DESCRIBE</span> <span class="k">DATABASE</span> <span class="n">EXTENDED</span> <span class="n">inventory</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-------------------------+-------------------------------------------+</span> |
| <span class="o">|</span><span class="n">database_description_item</span><span class="o">|</span> <span class="n">database_description_value</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-------------------------+-------------------------------------------+</span> |
| <span class="o">|</span> <span class="k">Database</span> <span class="n">Name</span><span class="o">|</span> <span class="n">inventory</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">Description</span><span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="k">Location</span><span class="o">|</span><span class="n">file</span><span class="p">:</span><span class="o">/</span><span class="k">temp</span><span class="o">/</span><span class="n">spark</span><span class="o">-</span><span class="n">warehouse</span><span class="o">/</span><span class="n">new_inventory</span><span class="p">.</span><span class="n">db</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">Properties</span><span class="o">|</span> <span class="p">((</span><span class="n">Edit</span><span class="o">-</span><span class="nb">date</span><span class="p">,</span><span class="mi">01</span><span class="o">/</span><span class="mi">01</span><span class="o">/</span><span class="mi">2001</span><span class="p">),</span> <span class="p">(</span><span class="n">Edited</span><span class="o">-</span><span class="k">by</span><span class="p">,</span><span class="n">John</span><span class="p">))</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-------------------------+-------------------------------------------+</span> |
| </code></pre></div></div> |
| |
| <h3 id="related-statements">Related Statements</h3> |
| |
| <ul> |
| <li><a href="sql-ref-syntax-aux-describe-database.html">DESCRIBE DATABASE</a></li> |
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