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  5. Teradata: Supported Data Types, Objects, and Operations

Teradata: Supported Data Types, Objects, and Operations

This section contains information on supported data types, objects, and operations for Oracle GoldenGate on Teradata.

Supported Teradata Data Types

The following are the Teradata data types that Oracle GoldenGate supports. Any limitations or conditions that apply, are mentioned after the list of supported datatypes.
  • BLOB
  • BYTE
  • VARBYTE
  • BIGINT
  • BYTEINT
  • DATE
  • DECIMAL
  • DOUBLE PRECISION
  • FLOAT
  • INTEGER
  • NUMBER
  • NUMERIC
  • REAL
  • SMALLIINT
  • TIME
  • TIMESTAMP
  • INTERVAL
  • INTERVAL DAY
  • INTERVAL DAY TO HOUR
  • INTERVAL DAY TO MINUTE
  • INTERVAL DAY TO SECOND
  • INTERVAL HOUR
  • INTERVAL HOUR TO MINUTE
  • INTERVAL HOUR TO SECOND
  • INTERVAL MINUTE
  • INTERVAL MINUTE TO SECOND
  • INTERVAL MONTH
  • INTERVAL SECOND
  • INTERVAL YEAR
  • INTERVAL YEAR TO MONTH
  • CHAR
  • CLOB
  • CHAR VARYING
  • LONG VARCHAR
  • VARCHAR
  • GRAPHIC
  • LONG VARGRAPHIC
  • VARGRAPHIC

Limitations of Support for Data Types

Here are the details of conditions and limitations of support for data types.

Date Data Types

The following are the limitations of support for date data types:

  • TIME with TIMESZONE, TIMESTAMP with TIMEZONE, and INTERVAL are not supported from a different type of source database to Teradata.

  • Oracle GoldenGate supports timestamp data from 0001/01/03:00:00:00 to 9999/12/31:23:59:59. If a timestamp is converted from GMT to local time, these limits also apply to the resulting timestamp. Depending on the time zone, conversion may add or subtract hours, which can cause the timestamp to exceed the lower or upper supported limit.

IDENTITY Columns

IDENTITY must be configured as GENERATED BY DEFAULT AS IDENTITY on the target to enable the correct value to be inserted by Replicat.

Large Object Data Types

The following is the limitation of support for large object data types:

  • Enable the UseNativeLOBSupport flag in the ODBC configuration file. See the Teradata ODBC documentation.

Numeric Data Types

When replicating the numeric data types to Teradata, truncation can occur if the source database supports a higher precision than Teradata does.

The support of range and precision for floating-point numbers depends on the host machine. In general, the precision is accurate to 16 significant digits, but you should review the database documentation to determine the expected approximations. Oracle GoldenGate rounds or truncates values that exceed the supported precision.

Multi-byte Character Data

For multi-byte character data, the following conditions and limitations are applicable:

  • Filtering, mapping, and transformation for multi-byte data types is not supported.

  • Set the ODBC driver to the UTF-16 character set in the initialization file.

  • When creating a Replicat, use the NODBCHECKPOINT option with the ADD REPLICAT command. The Replicat database check-pointing feature does not support an ODBC driver that is set to the UTF-16 character set. Checkpoints will be maintained in the checkpoint file on disk.

Supported Objects and Operations for Teradata

This section lists the data operations and database objects that Oracle GoldenGate supports.

  • Oracle GoldenGate for Teradata supports delivery (Replicat) of DML transactions to Teradata.

  • Oracle GoldenGate supports the maximum number of columns per table that is supported by the database.

  • Truncating operations are supported with the use of the GETTRUNCATES parameter.

  • Limitations on Automatic Heartbeat Table support are as follows:

    • The ALTER HEARTBEATTABLE command is not supported and if used is ignored.

    • The ADD HEARTBEATTABLE command with the FREQUENCY, PURGE_FREQUENCY, or RETENTION_TIME option is not supported. When any of these options are specified with the ADD HEARTBEATTABLE command, a warning is displayed that the option is ignored.

    • Since Teradata does not have any internal event/job schedulers, automatic purging of heartbeat history data does not occur. You need to explicitly delete or truncate records periodically from the heartbeat history table.

Non-Supported Operations for Teradata

This section lists the operations that Oracle GoldenGate for Teradata does not support.

  • Extract (capture) is not supported for Teradata

  • DDL replication