Overview

Partitioning refers to splitting what is logically one large table into smaller physical pieces based on specific schemes. The table based on the logic is called a partitioned table, and a physical piece is called a partition. Data is stored on these smaller physical pieces, namely, partitions, instead of the larger logical partitioned table.

Follow the steps below to define a table in your database:

1. In the Object Browser pane, right-click Regular Tables, and choose Create Partition Table.
2. Define basic table information, such as the table name and table type. For details, see Providing Basic Information.
3. Define column information, such as the column name, data type schema, data type, and column constraint. For details, see Defining a Column.
4. Select the data distribution information for the table. For details, see Change Order of Partition.
5. Define column constraints for different constraint types. Constraint types include PRIMARY KEY, UNIQUE, and CHECK. For details, see Defining Table Constraints.
6. Define table index information, such as the index name and access mode. For details, see Defining an Index.
7. Define the partition information for the table such as partition name, partition column, partition value and so on. For details, see Defining a Partition.

   On the SQL Preview tab, you can check the automatically generated SQL query. For details, see Checking the SQL Preview.

8. To add comments to Column in the Create Partition Table dialog box, add column information in Description of Column (Max 5000 chars) text box and click Add.

For details, see Providing Basic Information.

• Table Name
• Schema
• Options
• Description of Table

Perform the following steps to configure other parameters:

1. Select a table storage mode from the Table Orientation drop-down list.
   

   If table orientation is selected as ORC, then an HDFS Partitioned table is created.

2. Enter the ORC version number in the ORC Version field. This is applicable only for HDFS Partitioned table.
3. After providing the general information about the table, click Next to define the columns information for the table.

   The following table describes the parameters of partitioned tables.

   Table 1 Parameters

   Parameter	Row Partition	Column Partition	ORC Partition
   Table Type	x	x	x
   If Not Exists	√	√	√
   With OIDS	x	x	x
   Fill Factor	√	x	x

The following table describes the parameters of partitioned tables.