https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=38742 Bug ID: 38742 Summary: C4::AuthoritiesMarc::merge should call ModBiblio only if really needed Change sponsored?: --- Product: Koha Version: unspecified Hardware: All OS: All Status: NEW Severity: minor Priority: P5 - low Component: MARC Authority data support Assignee: koha-bugs@lists.koha-community.org Reporter: januszop@gmail.com QA Contact: testopia@bugs.koha-community.org Currently, the function C4::AuthoritiesMarc::merge calls ModBiblio for all bibliographic records linked to the modified authority record. It could seem a just behavior but we know that this could lead to performance problems. This is why AuthorityMergeLimit systempreference with merge_authorities.pl was introduced (earlier: dontmerge). Although this partially solves the performance problems, for moderately large and large catalogs (500+ K) and authority records linked with a large number of bibliographic records, performance problems still occur, even with overnight processing with merge_authorities.pl. This problem is particularly apparent when updating authority records from central databases, whose modifications are beyond our control. It turns out, however, that many such modifications to authority records involve fields other than the heading field (1XX in MARC 21), so these updates in fact do not modify bibliographic records. However, with the current merge function, every touch on an authority record forces a call to the ModBiblio function. The number of relatively expensive ModBiblio calls could be reduced by checking whether there has been an actual change in the field associated with the authority record. However, with IncludeSeeFromInSearches or IncludeSeeAlsoFromInSearches preferences enabled, the record should be refreshed in the search engine just in case (should the 4XX, 5XX fields have changed, which we don't know at this point). -- You are receiving this mail because: You are the assignee for the bug. You are watching all bug changes.