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| <h1 class="title">REPAIR TABLE</h1> |
| |
| |
| <h3 id="description">Description</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">MSCK REPAIR TABLE</code> recovers all the partitions in the directory of a table and updates the Hive metastore. When creating a table using <code class="language-plaintext highlighter-rouge">PARTITIONED BY</code> clause, partitions are generated and registered in the Hive metastore. However, if the partitioned table is created from existing data, partitions are not registered automatically in the Hive metastore. User needs to run <code class="language-plaintext highlighter-rouge">MSCK REPAIR TABLE</code> to register the partitions. <code class="language-plaintext highlighter-rouge">MSCK REPAIR TABLE</code> on a non-existent table or a table without partitions throws an exception. Another way to recover partitions is to use <code class="language-plaintext highlighter-rouge">ALTER TABLE RECOVER PARTITIONS</code>.</p> |
| |
| <p>If the table is cached, the command clears cached data of the table and all its dependents that refer to it. The cache will be lazily filled when the next time the table or the dependents are accessed.</p> |
| |
| <h3 id="syntax">Syntax</h3> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">MSCK</span> <span class="n">REPAIR</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="p">[</span><span class="err">{</span><span class="k">ADD</span><span class="o">|</span><span class="k">DROP</span><span class="o">|</span><span class="n">SYNC</span><span class="err">}</span> <span class="n">PARTITIONS</span><span class="p">]</span> |
| </code></pre></div></div> |
| |
| <h3 id="parameters">Parameters</h3> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies the name of the table to be repaired. The table name may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong><code class="language-plaintext highlighter-rouge">{ADD|DROP|SYNC} PARTITIONS</code></strong></p> |
| |
| <p>Specifies how to recover partitions. If not specified, <strong>ADD</strong> is the default.</p> |
| |
| <ul> |
| <li><strong>ADD</strong>, the command adds new partitions to the session catalog for all sub-folder in the base table folder that don’t belong to any table partitions.</li> |
| <li><strong>DROP</strong>, the command drops all partitions from the session catalog that have non-existing locations in the file system.</li> |
| <li><strong>SYNC</strong> is the combination of <strong>DROP</strong> and <strong>ADD</strong>.</li> |
| </ul> |
| </li> |
| </ul> |
| |
| <h3 id="examples">Examples</h3> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">-- create a partitioned table from existing data /tmp/namesAndAges.parquet</span> |
| <span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">t1</span> <span class="p">(</span><span class="n">name</span> <span class="n">STRING</span><span class="p">,</span> <span class="n">age</span> <span class="nb">INT</span><span class="p">)</span> <span class="k">USING</span> <span class="n">parquet</span> <span class="n">PARTITIONED</span> <span class="k">BY</span> <span class="p">(</span><span class="n">age</span><span class="p">)</span> |
| <span class="k">LOCATION</span> <span class="nv">"/tmp/namesAndAges.parquet"</span><span class="p">;</span> |
| |
| <span class="c1">-- SELECT * FROM t1 does not return results</span> |
| <span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">t1</span><span class="p">;</span> |
| |
| <span class="c1">-- run MSCK REPAIR TABLE to recovers all the partitions</span> |
| <span class="n">MSCK</span> <span class="n">REPAIR</span> <span class="k">TABLE</span> <span class="n">t1</span><span class="p">;</span> |
| |
| <span class="c1">-- SELECT * FROM t1 returns results</span> |
| <span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">t1</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-------+---+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span><span class="n">age</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-------+---+</span> |
| <span class="o">|</span><span class="n">Michael</span><span class="o">|</span> <span class="mi">20</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-------+---+</span> |
| <span class="o">|</span> <span class="n">Justin</span><span class="o">|</span> <span class="mi">19</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-------+---+</span> |
| <span class="o">|</span> <span class="n">Andy</span><span class="o">|</span> <span class="mi">30</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-ddl-alter-table.html">ALTER TABLE</a></li> |
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