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pg_table_size

pg_table_size，pg_relation_size和pg_total_relation_size有什么区别？ (PostgreSQL)

# SELECT pg_relation_size(20306, 'main') AS main, pg_relation_size(20306, 'fsm') AS fsm, pg_relation_size(20306, 'vm') AS vm, pg_relation_size(20306,  ......
size relation pg_total_relation_size pg_relation_size pg_table_size
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