| 摘要 |
<p>A hot migration operation is executed from a first version of a service (511) using a first data model (N), to a second version of the service (512) using a second data model (N+1) that is modified with respect to said first data model. A service comprises a client application (502), a data manager (501) and a data repository (503). The migrate operation is effected on a server facility (SA, SB) that accommodates multiple processes to be running in parallel. The second version client applications (506), a second version data manager (508) operating according to the said second data model, a second version data repository (507) arranged according to the said second data model and cooperating with the second version data manager are installed. The first and the second version data managers are provided each with a migration plug-in (505, 509). The method uses an incremental roll-over process, wherein in successive steps data is converted from said first version data repository to said second version data repository by means of the migration plug-in until all data will have been converted, after which any old version gets removable.</p> |
