Reference: Job Splitting Dimensions

CDM splits jobs for different data sources based on different dimensions. Table 1 lists the splitting dimensions.

**Table 1** Job splitting dimensions for different data sources
Data Source Category	Data Source	Job Splitting Rule
Data warehouse	GaussDB(DWS)	Jobs can be split based on table fields. Jobs cannot be split based on table partitions.
Data warehouse	Data Lake Insight (DLI)	Jobs can be split based on the partitioning information of partitioned tables. Jobs cannot be split based on non-partitioned tables.
Hadoop	MRS HDFS	Jobs can be split based on files.
	MRS HBase	Jobs can be split based on HBase regions.
	MRS Hive	When the read mode is HDFS, jobs can be split based on Hive files. When the read mode is JDBC, jobs cannot be split.
	FusionInsight HDFS	Jobs can be split based on files.
	FusionInsight HBase	Jobs can be split based on HBase regions.
	FusionInsight Hive	When the read mode is HDFS, jobs can be split based on Hive files. When the read mode is JDBC, jobs cannot be split.
	Apache HDFS	Jobs can be split based on files.
	Apache HBase	Jobs can be split based on HBase regions.
	Apache Hive	When the read mode is HDFS, jobs can be split based on Hive files. When the read mode is JDBC, jobs cannot be split.
Object storage	Object Storage Service (OBS)	Jobs can be split based on files.
File system	FTP	Jobs can be split based on files.
	SFTP	Jobs can be split based on files.
	HTTP	Jobs can be split based on files.
Relational database	RDS for MySQL	Jobs can be split based on table fields. Jobs can be split based on table partitions only when Extract by Partition is configured.
	RDS for PostgreSQL	Jobs can be split based on table fields. Jobs can be split based on table partitions only when Extract by Partition is configured.
	RDS for SQL Server	Jobs can be split based on table fields. Jobs can be split based on table partitions only when Extract by Partition is configured.
	MySQL	Jobs can be split based on table fields. Jobs can be split based on table partitions only when Extract by Partition is configured.
	PostgreSQL	Jobs can be split based on table fields. Jobs can be split based on table partitions only when Extract by Partition is configured.
	Microsoft SQL Server	Jobs can be split based on table fields. Jobs cannot be split based on table partitions.
	Oracle	Jobs can be split based on table fields. Jobs can be split based on table partitions only when Extract by Partition is configured.
	SAP HANA	Jobs can be split based on table fields. Jobs cannot be split based on table partitions.
	Database shard	Each backend connects to a subjob, which can be split based on primary keys.
NoSQL	Distributed Cache Service (DCS)	Jobs cannot be split.
	Redis	Jobs cannot be split.
	Document Database Service (DDS)	Jobs cannot be split.
	MongoDB	Jobs cannot be split.
	Cassandra	Jobs can be split based on the token range of Cassandra.
Message system	Data Ingestion Service (DIS)	Jobs can be split based on topics.
	Apache Kafka	Jobs can be split based on topics.
	DMS Kafka	Jobs can be split based on topics.
	MRS Kafka	Jobs can be split based on topics.
Search	Elasticsearch	Jobs cannot be split.
Search	Cloud Search Service (CSS)	Jobs cannot be split.