Dear Alban, thank you for your precious reply, first of all.
>> On 19 Sep 2017, at 15:47, Job <j...@colliniconsulting.it> wrote: >> >> Hi guys, >> >> we need to insert from a table to another (Postgresql 9.6.1) a large amount >> of data (about 10/20 millions of rows) without locking destination table. >> Pg_bulkload is the fastest way but it locks the table. >> >> Are there other ways? >> Classic "COPY" from? >We do something like that using a staging table to load to initially (although >not bulk; data arrives in our staging table with batches of 5k to 100k rows) >and then we transfer the data using insert/select and "on conflict do". >That data-transfer within PG takes a couple of minutes on our rather limited >VM for a wide 37M rows table (~37GB on disk). That only locks the staging >table (during initial bulkload) and the rows in the master table that are >currently being altered (during the insert/select). We use a "temporary" table, populated by pg_bulkload - it takes few minutes in this first step. Then, from the temporary table, datas are transferred by a trigger that copy the record into the production table. But *this step* takes really lots of time (sometimes also few hours). There are about 10 millions of record. We cannot use pg_bulkload to load directly data into production table since pg_bulkload would lock the Whole table, and "COPY" command is slow and would not care about table partitioning (COPY command fire partitioned-table triggers). Thank you for the help! F -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
