Document relminmxid and datminmxid

I introduced these new fields in 0ac5ad5134f27 but neglected to add them
to the system catalogs section of the docs.

Per Thom Brown in message
CAA-aLv7UiO=Whiq3MVbsEqSyQRthuX8Tb_RLyBuQt0KQBp=6EQ@mail.gmail.com

diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index e638a8fcb1a5012d446f15710e98fd9831e30147..09f7e40b29f29d1d1e119336907b01d8ebc84b50 100644 (file)
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -1884,6 +1884,19 @@
       
      
 
+     
+      relminmxid
+      xid
+      
+      
+       All multitransaction IDs before this one have been replaced by a
+       transaction ID in this table.  This is used to track
+       whether the table needs to be vacuumed in order to prevent multitransaction ID
+       ID wraparound or to allow pg_clog to be shrunk.  Zero
+       (InvalidTransactionId) if the relation is not a table.
+      
+     
+
      
       relacl
       aclitem[]
@@ -2621,6 +2634,20 @@
       
      
 
+     
+      datminmxid
+      xid
+      
+      
+       All multitransaction IDs before this one have been replaced with a
+       transaction ID in this database.  This is used to
+       track whether the database needs to be vacuumed in order to prevent
+       transaction ID wraparound or to allow pg_clog to be shrunk.
+       It is the minimum of the per-table
+       pg_class.relminmxid values.
+      
+     
+
      
       dattablespace
       oid