Hi all, in the docs I read:
"Adding a column with a non-null default [...] will require the entire table to be rewritten" I guess that that can't be read as "you can always assume that adding a nullable column to a table won't rewrite the whole table". I'm asking because since the page layout includes a null bitmap that "If it is present it begins just after the fixed header and occupies enough bytes to have one bit per data column", I guess that when all the bits in the bitmap are used when I add a column (even a nullable one) the table gets rewritten (to add a new byte to the nullable bitmap); is this true? -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
