Capabilities for PostgreSQL

This section lists the Capabilities of HVR when using 'PostgreSQL'. For more information about the pre-requisites, access privileges, and other configuration requirements, see Requirements for PostgreSQL.

Capture

HVR supports the following capabilities on PostgreSQL:

• Capture changes from location (PostgreSQL from version 8.0 to version 14).
• Log-based capture (capture from DBMS logging system) (PostgreSQL from version 9.4 to version 14).
• Log-based capture of tables without a primary key (PostgreSQL from version 9.4 to version 14).
• Direct access to logs on a file system (PostgreSQL from version 9.4 to version 14, except on Amazon RDS for PostgreSQL, Google Cloud SQL for PostgreSQL, and Microsoft Azure Database for PostgreSQL).
• Access to logs using SQL interface (PostgreSQL from version 9.4 to version 14).
• Log-based capture with /LogReadMethod parameter (PostgreSQL from version 9.4 to version 14).
• Log-based capture of tables with LOB column (PostgreSQL from version 9.4 to version 14).
• Log-based capture of truncate table statements (PostgreSQL from version 11, since HVR 5.7.5/43).
• Rewind log-based capture to specific time (Hvrinit option -i) (PostgreSQL from version 9.4 to version 14).
• Rewind log-based capture to the beginning of currently active oldest transaction (PostgreSQL from version 9.4 to version 14).
• Multiple log-based capture jobs can capture from same database (PostgreSQL from version 9.4 to version 14).
• Log-based capture checkpointing (action Capture /CheckpointingFrequency) (PostgreSQL from version 9.4 to version 14).

HVR does not support the following capabilities on PostgreSQL:

• Capture from Archive log files only.
• Log-based capture of DDL statements using action AdaptDDL.
• Log-based capture from hidden rowid/RRN column (ColumnProperties /CaptureFromRowId).
• Rewind log-based capture to the beginning of currently active oldest transaction for a specific list of tables.
• Online refresh using accurate LSN/SCN.
• Populates column hvr_cap_user for use in ColumnProperties {hvr_cap_user} substitutions.
• Capture from tables with basic compression.
• Hvrlogrelease to preserve journal/archives.
• Read archives from an alternative directory (Capture /ArchiveLogPath).
• Trigger-based capture (action Capture /TriggerBased).

Hub Database

HVR supports Hub database on PostgreSQL.

Integrate

HVR supports the following capabilities on PostgreSQL:

• Integrate changes into location (PostgreSQL from version 8.0 to version 14).
• Integrate with /Burst (PostgreSQL from version 8.0 to version 14).
• Integrate with /BurstCommitFrequency (PostgreSQL from version 8.0 to version 14).
• Continuous integration (Integrate without /Burst) (PostgreSQL from version 8.0 to version 14).
• Action TableProperties with /DuplicateRows for continuous integration (PostgreSQL from version 8.0 to version 14).
• Continuous Integrate with /OnErrorSaveFailed (without /Burst) (PostgreSQL from version 8.0 to version 14).
• Action Transform /SoftDelete (PostgreSQL from version 8.0 to version 14).
• Creation and update of HVR state tables (PostgreSQL from version 8.0 to version 14).

HVR does not support the following capabilities on PostgreSQL:

• Disable/enable database triggers during Integrate (/NoTriggerFiring).
• Integrate with /DbProc.

Bi-directional Replication

HVR supports the following capabilities on PostgreSQL:

• Detection of changes made by HVR in a bidirectional channel to prevent loop-back (PostgreSQL from version 8.0 to version 14, state table needs to be created before replication starts).
• CollisionDetect with /TimestampColumn (PostgreSQL from version 8.0 to version 14).

HVR does not support the following capabilities on PostgreSQL:

• CollisionDetect with Log-based Capture (without /TimestampColumn).

Refresh and Compare

HVR supports the following capabilities on PostgreSQL:

• Hvrrefresh or Hvrcompare from source location (PostgreSQL from version 8.0 to version 14).
• Hvrrefresh into target location (PostgreSQL from version 8.0 to version 14).
• Row-wise Hvrrefresh into target location (option -g) (PostgreSQL from version 8.0 to version 14).
• Select data from each table from same consistent moment in time using a single transaction (and session) with 'serializable' SQL isolation level (Hvrrefresh option -Mserializable) (PostgreSQL from version 8.0 to version 14).

Other Capabilities

HVR supports the following capabilities on PostgreSQL:

• Call database procedure dbproc during replication jobs (action AgentPlugin /DbProc) (PostgreSQL from version 11 to version 14).
• International table and column names where DBMS is not configured with UTF-8 encoding (PostgreSQL from version 8.0 to version 14).
• Treat DBMS table names and columns as case sensitive if configured (action LocationProperties /CaseSensitiveNames defined) (PostgreSQL from version 8.0 to version 14).
• Always treat DBMS table names and column names as case sensitive, even if not configured (action LocationProperties /CaseSensitiveNames not defined) (PostgreSQL from version 8.0 to version 14).
• Always treat DBMS schema names case sensitive (PostgreSQL from version 8.0 to version 14).

HVR does not support the following capabilities on PostgreSQL:

• Use distribution key for parallelizing changes within a table (ColumnProperties /DistributionKey).
• Lossless binary float datatypes. No dataloss when transporting float values (because base 2 fractions are never converted to base 10).
• Distinguish and support capture from 'materialized views'.