Oracle integrated CDC connector reference

Important

This feature is in Beta. Workspace admins can control access to this feature from the Previews page. See Manage Azure Databricks previews.

This page contains reference material for the Oracle integrated CDC connector in Databricks Lakeflow Connect.

Automatic data transformations

The connector maps Oracle data types to Azure Databricks (Delta-compatible) types as follows:

Oracle type	Azure Databricks type
NUMBER	STRING
NUMBER(p)	DECIMAL(p, 0)
NUMBER(p, s) where s < 0	DECIMAL(p + \|s\|, 0) if p + \|s\| <= 38, otherwise STRING
NUMBER(p, s) where 0 <= s <= p	DECIMAL(p, s)
NUMBER(p, s) where s > p	DECIMAL(s, s) if s <= 38, otherwise STRING
FLOAT	DECIMAL(38, 10)
BINARY_FLOAT	FLOAT
BINARY_DOUBLE	DOUBLE
CHAR, NCHAR, VARCHAR, VARCHAR2, NVARCHAR2, LONG	STRING
DATE	TIMESTAMP
TIMESTAMP	STRING
TIMESTAMP(p) WITH TIME ZONE (p <= 6)	TIMESTAMP with zoneId
TIMESTAMP(p) WITH LOCAL TIME ZONE (p <= 6)	TIMESTAMP with zoneId
TIMESTAMP(p) WITH [LOCAL] TIME ZONE (p > 6)	STRING
INTERVAL YEAR TO MONTH	INTERVAL YEAR TO MONTH. Mapped to STRING if the leading precision exceeds 8.
INTERVAL DAY TO SECOND	INTERVAL DAY TO SECOND. Mapped to STRING if the leading precision exceeds 8 or the fractional-seconds scale exceeds 6.
LONG RAW, RAW	BINARY (partially supported)
CLOB, NCLOB	STRING (partially supported)
BLOB	BINARY (partially supported)
ROWID, UROWID	STRING
XML (XMLTYPE), BFILE, JSON, VECTOR, BOOLEAN, and spatial types (for example, SDO_GEOMETRY)	Not supported

Large object (LOB) columns

The connector captures RAW, BLOB, CLOB, and NCLOB values that LogMiner delivers inline in the redo record. LogMiner includes these values inline with the SQL statement in the change log, so the connector reads them directly from the change. Large-object values that are written out of line, and that LogMiner therefore does not include in the redo record, are not captured.