Support ALTER TABLESPACE name SET/RESET ( tablespace_options ).

This patch only supports seq_page_cost and random_page_cost as parameters,
but it provides the infrastructure to scalably support many more.
In particular, we may want to add support for effective_io_concurrency,
but I'm leaving that as future work for now.

Thanks to Tom Lane for design help and Alvaro Herrera for the review.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/include/utils/spccache.h b/src/include/utils/spccache.h
new file mode 100644
index 00000000000..73b9f7370d9
--- /dev/null
+++ b/src/include/utils/spccache.h
@@ -0,0 +1,19 @@
+/*-------------------------------------------------------------------------
+ *
+ * spccache.h
+ *	  Tablespace cache.
+ *
+ * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * $PostgreSQL: pgsql/src/include/utils/spccache.h,v 1.1 2010/01/05 21:54:00 rhaas Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SPCCACHE_H
+#define SPCCACHE_H
+
+void get_tablespace_page_costs(Oid spcid, float8 *spc_random_page_cost,
+					     float8 *spc_seq_page_cost);
+
+#endif   /* SPCCACHE_H */