On 2019-11-14 23:47, blackfalconsoftw...@outlook.com [firebird-support] wrote: > Doesn't the page size definition as per a database depend on one > designs their database tables and how such tables will be used?
The page size doesn't restrict or limit your database design, with the exception of indexable items. The maximum keysize is slightly less than 1/4 of the page size. This means that with a page size of 4096, the max you can index is +/- VARCHAR(1020) in a single byte character set or +/- VARCHAR(256) UTF8 (I'm saying +/- here because exact size depends on collations etc), while with page size 16384, the maximum is +/- VARCHAR(4092) single byte character set / VARCHAR(1023) UTF8. That said, trying to avoid such oversized indexes would be better: the more keys fit on a single page, the more efficient the index. With a larger page size, more records will fit on a single page (or very wide records might fit on less pages). Page size can have influence on performance, and generally larger page sizes are 'better' (although that also depends on the underlying storage). However, if you use a lot of relatively small blobs, you could be wasting more diskspace. Mark
