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| <section id="primary-key-table"> |
| <h1>Primary Key Table<a class="headerlink" href="#primary-key-table" title="Link to this heading">#</a></h1> |
| <p>If you define a table with primary key, you can insert, update or delete records |
| in the table.</p> |
| <p>Primary keys consist of a set of columns that contain unique values for each |
| record. Paimon enforces data ordering by sorting the primary key within each |
| bucket, allowing users to achieve high performance by applying filtering |
| conditions on the primary key.</p> |
| <section id="bucket"> |
| <h2>Bucket<a class="headerlink" href="#bucket" title="Link to this heading">#</a></h2> |
| <p>Unpartitioned tables, or partitions in partitioned tables, are sub-divided into |
| buckets, to provide extra structure to the data that may be used for more |
| efficient querying.</p> |
| <p>Each bucket directory contains an LSM tree and its changelog files.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Changelog is not supported yet for C++ Paimon primary key table write.</p> |
| </div> |
| <p>The range for a bucket is determined by the hash value of one or more columns in |
| the records. Users can specify bucketing columns by providing the bucket-key option. |
| If no bucket-key option is specified, the primary key (if defined) or the complete |
| record will be used as the bucket key.</p> |
| <p>A bucket is the smallest storage unit for reads and writes, so the number of |
| buckets limits the maximum processing parallelism. This number should not be too |
| big, though, as it will result in lots of small files and low read performance. |
| In general, the recommended data size in each bucket is about 200MB - 1GB.</p> |
| <p>Also, see rescale bucket if you want to adjust the number of buckets after a |
| table is created.</p> |
| </section> |
| <section id="lsm-trees"> |
| <h2>LSM Trees<a class="headerlink" href="#lsm-trees" title="Link to this heading">#</a></h2> |
| <p>Paimon adopts the LSM tree (log-structured merge-tree) as the data structure for |
| file storage. This documentation briefly introduces the concepts about LSM trees.</p> |
| <section id="sorted-runs"> |
| <h3>Sorted Runs<a class="headerlink" href="#sorted-runs" title="Link to this heading">#</a></h3> |
| <p>LSM tree organizes files into several sorted runs. A sorted run consists of one |
| or multiple data files and each data file belongs to exactly one sorted run.</p> |
| <p>Records within a data file are sorted by their primary keys. Within a sorted run, |
| ranges of primary keys of data files never overlap.</p> |
| <a class="reference internal image-reference" href="../_images/sorted-runs.png"><img alt="Sorted Runs" class="align-center" src="../_images/sorted-runs.png" style="width: 100%;" /> |
| </a> |
| <p>As you can see, different sorted runs may have overlapped primary key ranges, |
| and may even contain the same primary key. When querying the LSM tree, all |
| sorted runs must be combined and all records with the same primary key must be |
| merged according to the user-specified merge engine and the timestamp of each record.</p> |
| <p>New records written into the LSM tree will be first buffered in memory. When the |
| memory buffer is full, all records in memory will be sorted and flushed to disk. |
| A new sorted run is now created.</p> |
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