Version - PostgreSQL 10.20, compiled by Visual C++ build 1800, 64-bit
Platform - Windows
Regarding PostgreSQL, during the migration from PG 10.20 to 14.7, we will perform a sanity check on the migrated tables using source and destination row counts. Occasionally, we encounter count mismatches where the source database has fewer rows, resulting in a higher count, or more rows, resulting in a lower count.
Note: There are no migration issues, as all data rows have been successfully migrated without data loss.
ProdDB=> select count(*) from PdtDetailsTable; count --------- 1297324 (1 row) ProdDB=> reindex table PdtDetailsTable; REINDEX ProdDB=> select count(*) from PdtDetailsTable; count --------- 1297322 (1 row) ProdDB=>
Upon reindexing, the count(*) query returns the correct results in the source DB.
In the pg_log, we couldn’t find any traces related to this behavior. Is there a reason for such behavior, and how can this be addressed to prevent future issues?