Pg_upgrade has the following check to make sure the cluster is safe for
upgrading:
res = executeQueryOrDie(conn,
"SELECT n.nspname, c.relname, a.attname
"
"FROM pg_catalog.pg_class c, "
" pg_catalog.pg_namespace n, "
" pg_catalog.pg_attribute a "
"WHERE c.oid = a.attrelid AND "
" NOT a.attisdropped AND "
" a.atttypid IN ( "
" 'pg_catalog.regproc'::pg_catalog.regtype, "
" 'pg_catalog.regprocedure'::pg_catalog.regtype, "
" 'pg_catalog.regoper'::pg_catalog.regtype, "
" 'pg_catalog.regoperator'::pg_catalog.regtype, "
/* regclass.oid is preserved, so 'regclass' is OK */
/* regtype.oid is preserved, so 'regtype' is OK */
" 'pg_catalog.regconfig'::pg_catalog.regtype, "
" 'pg_catalog.regdictionary'::pg_catalog.regtype) AND
"
" c.relnamespace = n.oid AND "
" n.nspname != 'pg_catalog' AND "
" n.nspname != 'information_schema'");
Based on a report from EnterpriseDB, I noticed that we check all
pg_class entries, while there are cases where this is unnecessary
because there is no data behind the entry, e.g. views. Here are the
relkinds supported:
#define RELKIND_RELATION 'r' /* ordinary table */
#define RELKIND_INDEX 'i' /* secondary index */
#define RELKIND_SEQUENCE 'S' /* sequence object */
#define RELKIND_TOASTVALUE 't' /* for out-of-line
values */
#define RELKIND_VIEW 'v' /* view */
#define RELKIND_COMPOSITE_TYPE 'c' /* composite type */
#define RELKIND_FOREIGN_TABLE 'f' /* foreign table */
#define RELKIND_UNCATALOGED 'u' /* not yet cataloged */
What types, other than views, can we skip in this query?
--
Bruce Momjian <br...@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
--
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