https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=21288

--- Comment #2 from paxed <[email protected]> ---
Created attachment 78307
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https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=78307&action=edit
Bug 21288: Slowness in acquisition caused by GetInvoices

The SQL query done by GetInvoices is quite slow on our production server,
taking about a minute.

In the query, there's this join:

  LEFT JOIN subscription ON biblio.biblionumber = subscription.biblionumber

but there's no index on subscription.biblionumber. Adding the index speeds
up the query so it only takes up about 3 seconds.

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