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Description of problem:

Very big library (complete export of 1.5Tb). When trying to generate an incremental export of the library (all repositories), a very long time is spent on some DB queries. 

Version-Release number of selected component (if applicable):


How reproducible:
Unsure. All the time on customer's environment

Steps to Reproduce:
In theory, that's what customer did:

1. Generate complete export of big library
2. After a while, generate incremental exports using fs-export (syncable method)


Actual results:
Export works, but is very slow. Last test from customer took 24h running. Result had 3.5Gb of data (which is not wrong, just time to generate it is considered too long)

Expected results:

Export to finish faster.

Additional info:

I don't know that this is one issue, but perhaps a combination of https://github.com/pulp/pulpcore/pull/4161 (which is already tracked by BZ https://bugzilla.redhat.com/show_bug.cgi?id=2226950) and https://github.com/pulp/pulpcore/issues/3969 ?

We have that work in progress currently for other stakeholders anyway, so we can check back in shortly when it is finished and see if the situation is improved.

These 3 BZs ought to be tested together as they involve essentially the same setup process

https://bugzilla.redhat.com/show_bug.cgi?id=2238906
https://bugzilla.redhat.com/show_bug.cgi?id=2228592 (this one)
https://bugzilla.redhat.com/show_bug.cgi?id=2244521