Hi when i am doing check in I am getting the following error can any one suggest solution Some of your tables have problems with their auto_increment values which may lead to data loss. You should not ignore this warning. The problem is that InnoDB does not keep auto_increment across SQL server restarts (it is only set in memory). So on server startup the auto_increment values are set to max(table.id)+1. To know how to avoid this problem see the related wiki page: DBMS auto increment fix <https://wiki.koha-community.org/wiki/DBMS_auto_increment_fix> Problems foundPatrons The following ids exist in both tables borrowers and deletedborrowers: 53 Bibliographic records The following ids exist in both tables biblio and deletedbiblio: 3288 Checkouts The following ids exist in both tables issues and old_issues: 1 -- Y.Yatheesh Babu 8247838231