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DBZ-7917 Improve read only incremental snapshot doc

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Co-authored-by: roldanbob <broldan@redhat.com>
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Fiore Mario Vitale 2024-06-14 10:05:42 +02:00 committed by Jiri Pechanec
parent 70fba6561b
commit 971e1fc1ab
1 changed files with 4 additions and 3 deletions
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documentation/modules/ROOT/pages/connectors/postgresql.adoc
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@ -265,13 +265,13 @@ ifdef::community[]
The PostgreSQL connector allows for running incremental snapshots with a read-only connection to the database.
To run an incremental snapshot with read-only access, the connector uses the current in-progress transaction as high and low watermarks.
The state of a chunk's window is updated by comparing the txId of write-ahead-log events or the heartbeats against low and high watermarks.
The state of a chunk's window is updated by comparing the transaction ID of write-ahead-log events or heartbeat events against low and high watermarks.
To switch to a read-only implementation, set the value of the xref:postgres-property-read-only[`read.only`] property to `true`.
.Prerequisites
* PostgreSQL greater than or equal to 13.
* PostgreSQL version 13 or later.
==== Ad hoc read-only incremental snapshots
@ -3668,7 +3668,8 @@ Set this option to prevent rapid growth of the signaling data collection.
ifdef::community[]
|[[postgres-property-read-only]]<<postgres-property-read-only, `+read.only+`>>
|`false`
|Switch to alternative incremental snapshot watermarks implementation to avoid writes to signal data collection
|Specifies whether a connector writes watermarks to the signal data collection to track the progress of an incremental snapshot.
Set the value to `true` to enable a connector that has a read-only connection to the database to use an incremental snapshot watermarking strategy that does not require writing to the signal data collection.
endif::community[]
|[[postgresql-property-xmin-fetch-interval-ms]]<<postgresql-property-xmin-fetch-interval-ms, `+xmin.fetch.interval.ms+`>>