Why does the database size reduce in PostgreSQL post migration from Oracle schema having lob, clob and blob datatypes
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The main reason is that Postgres by default compresses values that are bigger than (approximately) 2000 bytes of data variable length data types - these are mainly
text,varcharandbyteatypes.Oracle will only compress the content of LOB columns if you are using the Enterprise Edition and enable the compression when defining the LOB column (the most important part is to use
SecureFileinstead ofBasicFile).Most probably your LOB columns where defined without using compression in Oracle and contain many values bigger than 2000 bytes, that's why you see a reduction in size due to Postgres' automatic compression.