Adding a Shadow File
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If a database is expected to increase in size, consider adding files to its shadow. To add a shadow file, first use DROP SHADOW to delete the existing shadow, then use CREATE SHADOW to create a multifile shadow.
The page length you allocate for secondary shadow files need not correspond to the page length of the database’s secondary files. As the database grows and its first shadow file becomes full, updates to the database automatically overflow into the next shadow file.