PostgreSQL to Greenplum

Target DataSource：

Greenplum

Connection

Function	Description
Schema Migration	If the target schema does not exist, BladePipe will automatically generate and execute CREATE statements based on the source metadata and the mapping rule.
Full Data Migration	Migrate data by sequentially scanning data in tables and writing it in batches to the target database.
Incremental Data Sync	Sync of common DML like INSERT, UPDATE, DELETE is supported.
Data Verification and Correction	Verify all existing data. Optionally, you can correct the inconsistent data based on verification results. Scheduled DataTasks are supported. For more information, see Create Verification and Correction DataJob.
Subscription Modification	Add, delete, or modify the subscribed tables with support for historical data migration. For more information, see Modify Subscription.
Table Name Mapping	Support the mapping rules, namely, keeping the name the same as that in Source, converting the text to lowercase, converting the text to uppercase, truncating the name by "_digit" suffix.
DDL Sync	PostgreSQL DDL sync is realized by triggers. The user should have the permissions on triggers and tables. For more information, see Permissions Required for PostgreSQL
Metadata Retrieval	Retrieve the target metadata with filtering conditions from the source table.

Function	Description
Handling of Zero Value for Time	Allow setting zero value for time to different data types to prevent errors when writing to the Target.
Custom Code	For more information, see Custom Code Processing, Debug Custom Code and Logging in Custom Code.
Data Filtering Conditions	Support data filtering using WHERE conditions, with SQL-92 as the SQL language. For more information, see Data Filtering.
Setting Target Primary Key	Change the primary key to another field to facilitate data aggregation and other operations.

Limit	Description
Primary Key Conflict Handling	PostgreSQL <= 9.4 or Greenplum <= 6 does not support conflict skipping or replacement. Performance may be affected when there are a large number of primary key conflicts.

Prerequisite	Description
Permissions for Account	Required permissions (taking a self-managed database as an example): GRANT ALL PRIVILEGES ON DATABASE sync_db TO sync_user (or SELECT permission on all views in the sync_db information_schema, and SELECT permission on tables, indexes, constraints to be synchronized) ALTER USER sync_user REPLICATION
Incremental Data Sync Preparation	Prepare as follows: Modify postgresql.conf, set wal_level=logical and wal_log_hints=on Modify pg_hba.conf, set host replication sync_user CIDR netmask md5, host sync_db sync_user CIDR netmask md5, host postgres sync_user CIDR netmask md5 Restart PostgreSQL
Port Preparation	Allow the migration and sync node (Worker) to connect to the PostgreSQL port (e.g., port 5432).

Prerequisite

Description

Permissions for Account

Required permissions (taking a self-managed database as an example):

GRANT ALL PRIVILEGES ON DATABASE sync_db TO sync_user (or SELECT permission on all views in the sync_db information_schema, and SELECT permission on tables, indexes, constraints to be synchronized)
ALTER USER sync_user REPLICATION

Incremental Data Sync Preparation

Prepare as follows:

Modify postgresql.conf, set wal_level=logical and wal_log_hints=on
Modify pg_hba.conf, set host replication sync_user CIDR netmask md5, host sync_db sync_user CIDR netmask md5, host postgres sync_user CIDR netmask md5
Restart PostgreSQL

Port Preparation

Allow the migration and sync node (Worker) to connect to the PostgreSQL port (e.g., port 5432).

Parameter	Description
fullFetchSize	Fetch size for scaning full data.
eventStoreSize	Cache size for parsed incremental events.
ignoreGisSRID	Whether to ignore SRID when parsing GIS data types.
defaultGisSRID	Set the SRID for GIS data types.

Tips: To modify the general parameters, see General Parameters and Functions.

Prerequisite	Description
Permissions for Account	Required permissions include SELECT, INSERT, DELETE, UPDATE, and common DDL permissions. For Aliyun AnalyticDB for PostgreSQL, initial accounts or those with SELECT, INSERT, DELETE, UPDATE, and common DDL permissions are needed.
Port Preparation	Allow the migration and sync node (sidecar) to connect to PostgreSQL / Greenplum / AnalyticDB for PostgreSQL / PolarDB for PostgreSQL standard interactive interface (e.g., 5432).

Parameter	Description
keyConflictStrategy	Strategy for handling primary key conflicts during write in Incremental DataTask: IGNORE: Ignore conflicts (default) REPLACE: Replace conflicts (optional)
dstWholeReplace	Convert INSERT and UPDATE operations into full row replacement in the Target.
enableTimeZoneProcess	Enable time zone conversion to datetime fields.
timezone	Target time zone, e.g., +08:00, Asia/Shanghai, America/New_York.
defaultZeroDate	Default value for replacing '0000-00-00 00:00:00' / '0000-00-00' values. Optional values include: null (empty) Time (14:23:33) Date (1970-01-01) DateTime (1970-01-01 00:00:00), TimeZone Time (14:23:33+08:00 or 1970-01-01 00:00:00+08:00)
caseSensitive	Case sensitivity strategy for SQL statements, including: UpperCase: Convert to uppercase LowerCase: Convert to lowercase Sensitive: Add qualifiers NoSpecified: No conversion/No qualifiers
writeStrategy	Strategy of writing data to the Target, including: ROW (single row) MULTI_SQL (multiple statements) BATCH (write data in batches, default option) COPY (PostgreSQL COPY command)
defaultGisSRID	Set the SRID for GIS data types.

Tips: To modify the general parameters, see General Parameters and Functions.