On 10.04.2017 13:46, Greg Stark wrote:
On 4 April 2017 at 17:10, Maksim Milyutin <m.milyu...@postgrespro.ru> wrote:

3. As I noticed early pg_depend table is used for cascade deleting indexes
on partitioned table and its children. I also use pg_depend to determine
relationship between parent and child indexes when reindex executes
recursively on child indexes.

Perhaps, it's not good way to use pg_depend to determine the relationship
between parent and child indexes because the kind of this relationship is
not defined. I could propose to add into pg_index table specific field of
'oidvector' type that specify oids of dependent indexes for the current
local index.

Alternately you could have an single oid in pg_index on each of the
children that specifies which local index is its parent. That would
probably require a new index on that column so you could look up all
the children efficiently.

I think it would behave more sensibly when you're adding or removing a
partition, especially if you want to add many partitions in parallel
using multiple transactions. An oidvector of children would
effectively mean you could only be doing one partition creation or
deletion at a time.

Thanks for your comment. Your approach sounds better than mine. I'll try it.

Maksim Milyutin
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company

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