https://userapps.support.sap.com/sap/support/knowledge/en/3314918
3314918 - db2start fails with SQL1220N The database manager failed to allocate shared memory | SAP...
db2start fails with SQL1220N The database manager failed to allocate shared memory Further checking the db2diag.log the reason is given. 2023-03-20-16.08.25....