SWAP_PARTITIONS_BETWEEN_TABLES

Swaps partitions between two tables.

This is a meta-function. You must call meta-functions in a top-level SELECT statement.

Behavior type

Syntax

SWAP_PARTITIONS_BETWEEN_TABLES (
    '[[{namespace. | database. }]schema.]staging-table',
    'min-range-value',
    'max-range-value',
    '[[{namespace. | database. }]schema.]target-table'
     [, force-split]
)

Arguments

{ namespace. | database. }

Name of the database or namespace that contains table:

• Database name: If specified, it must be the current database.

• Namespace name (Eon Mode only): You must specify the namespace of objects in non-default namespaces. If no namespace is provided, Vertica assumes the object is in the default namespace.

For Eon Mode databases, the namespaces of staging-table and target-table must have the same shard count.

schema

Name of the schema, by default public. If you specify the namespace or database name, you must provide the schema name, even if the schema is public.

staging-table

The staging table from which to swap partitions.

min-range-value, max-range-value

The minimum and maximum value of partition keys to swap, where min‑range‑value must be ≤ max‑range‑value. To specify a single partition key, min‑range‑value and max‑range‑value must be equal.

target-table

The table to which the partitions are to be swapped. The target table cannot be the same as the staging table.

force-split

Optional Boolean argument, specifies whether to split ROS containers if the range of partition keys spans multiple containers or part of a single container:

• true: Split ROS containers as needed.

• false (default): Return with an error if ROS containers must be split to implement this operation.

Privileges

Non-superuser, one of the following:

• Owner of source and target tables

• Target and source tables: TRUNCATE, INSERT, SELECT

Requirements

The following attributes of both tables must be identical:

• Column definitions, including NULL/NOT NULL constraints

• Segmentation

• Partition clause

• Number of projections

• Shard count (Eon Mode only)

• Projection sort order

• Primary and unique key constraints. However, the key constraints do not have to be identically enabled. For more information on constraints, see Constraints.

  Note

  If the target table has primary or unique key constraints enabled and copying or moving the partitions will insert duplicate key values into the target table, Vertica rolls back the operation.

• Check constraints. For MOVE_PARTITIONS_TO_TABLE and COPY_PARTITIONS_TO_TABLE, Vertica enforces enabled check constraints on the target table only. For SWAP_PARTITIONS_BETWEEN_TABLES, Vertica enforces enabled check constraints on both tables. If there is a violation of an enabled check constraint, Vertica rolls back the operation.

• Number and definitions of text indices.

Additionally, If access policies exist on the source table, the following must be true:

• Access policies on both tables must be identical.

• One of the following must be true:

  • The executing user owns the target table.

  • AccessPolicyManagementSuperuserOnly is set to true.

Restrictions

The following restrictions apply to the source and target tables:

• If the source and target partitions are in different storage tiers, Vertica returns a warning but the operation proceeds. The partitions remain in their existing storage tier.

• The target table cannot be immutable.

• The following tables cannot be used as sources or targets:

  • Temporary tables

  • Virtual tables

  • System tables

  • External tables

Examples

See Swapping partitions.