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Comparison of test_decoding and pglogical plugins in Amazon Aurora PostgreSQL for data migration using AWS DMS
- AWS DMS is a popular service for homogeneous and heterogeneous database migrations and uses logical replication slots to reduce downtime during migration.
- AWS DMS supports test_decoding and pglogical plugins for logical decoding for PostgreSQL users.
- Logical_decoding_work_mem is a key parameter that impacts the CDC operations and hence efficiency of data migration.
- Tuning logical decoding memory can reduce disk spills and enhance resilience and performance.
- pglogical plugin offers filtering of non-CDC tables at the replication slot and reduces network bandwidth needed.
- Choosing the right logical decoding plugin and adhering to migration best practices can maximize the efficiency of data migration.
- Logical_decoding_work_mem can be adjusted to improve AWS DMS CDC performance.
- Optimizing and adjusting the logical_decoding_work_mem parameter can reduce spills to disk.
- Choosing the correct database instance size, monitoring with alerts and migration tasks is essential.
- The pglogical plugin is suitable for workloads that do not involve all tables being part of the CDC process.
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