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debezium-examples/postgres-toast at main · debezium/debezium-examples

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PostgreSQL has a hard limit on the page size. This means that values larger than ca. 8 KB need to be stored using TOAST storage. This impacts replication messages coming from database, as the values that were stored using the TOAST mechanism and have not been changed are not included in the message, unless they are part of the table’s replica identity. The corresponding fields in Debezium change events will have configurable marker value in this case (defaulting to __debezium_unavailable_value). This demo shows two ways for handling such marker values: Further strategies could be to produce dynamic updates in sink datastores (ignoring the column from update statements if the value is the marker value) or adding the affected column to the source table's replica identity, either by using replica identity full or an index-based replica identity. Be sure to work with the latest Debezium and Postgres container images for the following. Then register an instance of the Debezium Postgres conn

Dealing With Postgres TOAST Column Values PostgreSQL has a hard limit on the page size. This means that values larger than ca. 8 KB need to be stored using TOAST storage. This impacts replication messages coming from database, as the values that were stored using the TOAST mechanism and have not been changed are not included in the message, unless they are part of the table’s replica identity. The corresponding fields in Debezium change events will have configurable marker value in this case (defaulting to __debezium_unavailable_value). This demo shows two ways for handling such marker…

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