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Search on very big (partitioned) table

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Hu guys,
 
we have a test machine with Postgresql 9.6.1 an about 800.000.000 record in a table.
Table is partitioned by day, with indexes on partitioned table.
 
Also a simple query (for example i want to search log occurred in a specific day), is immediate in tha partitioned table (table_2017_02_15) but *extremely* slow in global table.
 
Where am i wrong?

Thank you!
/F
 

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