“…- Six focused on database maintenance in preparation for migration (Darcovich et al, 2018; Dressler, 2014; Georgieva and Flinchbaugh, 2021; Walsh, 2010; Wu et al, 2016; Wu et al, 2019).
- 39 papers were about maintenance or sustainability of a system separate from migration (Bond, 2006; Dal Pra et al, 2019; Downs & Chen, 2010; Gordon et al, 2015; Greenberg et al, 2009; Greig & Nixon, 2007; Gries et al, 2018; Han, 2011; Herrera, 2007; Imker, 2020; Jeng et al, 2017; Jiang et al, 2015; Jones et al, 2000; Kertesz et al, 2020; Lafferty‐Hess et al, 2020; Le et al, 2015; Lee et al, 2018; Lutz & Meadow, 2006; Madsen & Oleen, 2013; Manninen, 2018; Marcial & Hemminger, 2010; Nagendra et al, 2001; Nie et al, 2021; Owen & Michalak, 2015; Park et al, 2018; Philipson, 2020; Post et al, 2019; Powell & Moseley, 2021; Reilly, 2009; Rossi & Ahmed, 2016; Rousidis et al, 2014; Schuler & Kesselman, 2018; Stolte et al, 2003; Trisovic et al, 2020; Tuan et al, 2011; Waldron, 2017; Wilkinson et al, 2017; Xu et al, 2016; Zohner et al, 2019).
- Two papers took a broad look at both migration and maintenance (Stigler & Steiner, 2018; Thomer & Twidale, 2014).
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