What changed?

8.0 → 8.1
+ aggsortop  oid

8.0 → 8.1
+ amoptionalkey  boolean
+ amgetmulti  regproc
- amowner  integer
~ column order changed

--- 8.0
+++ 8.1
@@ -0,0 +1,4 @@
+roleid  oid
+member  oid
+grantor  oid
+admin_option  boolean

--- 8.0
+++ 8.1
@@ -0,0 +1,11 @@
+rolname  name
+rolsuper  boolean
+rolinherit  boolean
+rolcreaterole  boolean
+rolcreatedb  boolean
+rolcatupdate  boolean
+rolcanlogin  boolean
+rolconnlimit  integer
+rolpassword  text
+rolvaliduntil  timestamp with time zone
+rolconfig  text[]

--- 8.0
+++ 8.1
@@ -0,0 +1,8 @@
+vacrelid  oid
+enabled  boolean
+vac_base_thresh  integer
+vac_scale_factor  real
+anl_base_thresh  integer
+anl_scale_factor  real
+vac_cost_delay  integer
+vac_cost_limit  integer

8.0 → 8.1
~ relowner  integer → oid

8.0 → 8.1
~ conowner  integer → oid

8.0 → 8.1
+ datconnlimit  integer
~ datdba  integer → oid

--- 8.0
+++ 8.1
@@ -1,4 +1,4 @@
-(relation) The catalog pg_depend records the dependency relationships between database objects. This information allows DROP commands to find which other objects must be dropped by DROP CASCADE or prevent dropping in the DROP RESTRICT case.
+(relation) The catalog pg_depend records the dependency relationships between database objects. This information allows DROP commands to find which other objects must be dropped by DROP CASCADE or prevent dropping in the DROP RESTRICT case. See also pg_shdepend, which performs a similar function for dependencies involving objects that are shared across a database cluster.
 classid: The OID of the system catalog the dependent object is in
 objid: The OID of the specific dependent object
 objsubid: For a table column, this is the column number (the objid and classid refer to the table itself). For all other object types, this column is zero.

8.0 → 8.1
~ grolist  integer[] → oid[]
~ grosysid  integer → oid

8.0 → 8.1
~ column order changed

--- 8.0
+++ 8.1
@@ -1,7 +1,7 @@
-(relation) The catalog pg_language registers languages in which you can write functions or stored procedures. See CREATE LANGUAGE and Chapter 34 for more information about language handlers.
+(relation) The catalog pg_language registers languages in which you can write functions or stored procedures. See CREATE LANGUAGE and Chapter 35 for more information about language handlers.
 lanname: Name of the language
 lanispl: This is false for internal languages (such as SQL) and true for user-defined languages. Currently, pg_dump still uses this to determine which languages need to be dumped, but this may be replaced by a different mechanism sometime.
-lanpltrusted: This is a trusted language. If this is an internal language (lanispl is false) then this column is meaningless.
+lanpltrusted: True if this is a trusted language, which means that it is believed not to grant access to anything outside the normal SQL execution environment. Only superusers may create functions in untrusted languages.
 lanplcallfoid: For noninternal languages this references the language handler, which is a special function that is responsible for executing all functions that are written in the particular language.
 lanvalidator: This references a language validator function that is responsible for checking the syntax and validity of new functions when they are created. Zero if no validator is provided.
 lanacl: Access privileges; see GRANT and REVOKE for details.

8.0 → 8.1
+ locktype  text
+ page  integer
+ tuple  smallint
+ transactionid  xid
+ classid  oid
+ objid  oid
+ objsubid  smallint
~ column order changed

8.0 → 8.1
~ nspowner  integer → oid

8.0 → 8.1
~ opcowner  integer → oid

8.0 → 8.1
~ oprowner  integer → oid

--- 8.0
+++ 8.1
@@ -0,0 +1,6 @@
+tmplname  name
+tmpltrusted  boolean
+tmplhandler  text
+tmplvalidator  text
+tmpllibrary  text
+tmplacl  aclitem[]

--- 8.0
+++ 8.1
@@ -0,0 +1,5 @@
+transaction  xid
+gid  text
+prepared  timestamp with time zone
+owner  name
+database  name

8.0 → 8.1
+ proallargtypes  oid[]
+ proargmodes  "char"[]
~ proowner  integer → oid

--- 8.0
+++ 8.1
@@ -0,0 +1,11 @@
+rolname  name
+rolsuper  boolean
+rolinherit  boolean
+rolcreaterole  boolean
+rolcreatedb  boolean
+rolcatupdate  boolean
+rolcanlogin  boolean
+rolconnlimit  integer
+rolpassword  text
+rolvaliduntil  timestamp with time zone
+rolconfig  text[]

8.0 → 8.1
~ usesysid  integer → oid

--- 8.0
+++ 8.1
@@ -0,0 +1,6 @@
+dbid  oid
+classid  oid
+objid  oid
+refclassid  oid
+refobjid  oid
+deptype  "char"

--- 8.0
+++ 8.1
@@ -1 +1 @@
-(relation) One row per server process, showing process ID, database, user, current query, and the time at which the current query began execution. The columns that report data on the current query are only available if the parameter stats_command_string has been turned on. Furthermore, these columns read as null unless the user examining the view is a superuser or the same as the user owning the process being reported on. (Note that because of the collector's reporting delay, current query will only be up-to-date for long-running queries.)
+(relation) One row per server process, showing database OID, database name, process ID, user OID, user name, current query, time at which the current query began execution, time at which the process was started, and client's address and port number. The columns that report data on the current query are only available if the parameter stats_command_string has been turned on. Furthermore, these columns read as null unless the user examining the view is a superuser or the same as the user owning the process being reported on. (Note that because of the collector's reporting delay, the current query will only be up-to-date for long-running queries.)

--- 8.0
+++ 8.1
@@ -1 +1 @@
-(relation) For each index in the current database, the total number of index scans that have used that index, the number of index rows read, and the number of successfully fetched heap rows. (This may be less when there are index entries pointing to expired heap rows.)
+(relation) For each index in the current database, the table and index OID, schema, table and index name, number of index scans initiated on that index, number of index entries returned by index scans, and number of live table rows fetched by simple index scans using that index.

--- 8.0
+++ 8.1
@@ -1 +1 @@
-(relation) For each table in the current database, total numbers of sequential and index scans, total numbers of rows returned by each type of scan, and totals of row insertions, updates, and deletions.
+(relation) For each table in the current database (including TOAST tables), the table OID, schema and table name, number of sequential scans initiated, number of live rows fetched by sequential scans, number of index scans initiated (over all indexes belonging to the table), number of live rows fetched by index scans, and numbers of row insertions, updates, and deletions.

--- 8.0
+++ 8.1
@@ -1 +1 @@
-(relation) One row per database, showing the number of active backend server processes, total transactions committed and total rolled back in that database, total disk blocks read, and total number of buffer hits (i.e., block read requests avoided by finding the block already in buffer cache).
+(relation) One row per database, showing database OID, database name, number of active server processes connected to that database, number of transactions committed and rolled back in that database, total disk blocks read, and total buffer hits (i.e., block read requests avoided by finding the block already in buffer cache).

--- 8.0
+++ 8.1
@@ -1 +1 @@
-(relation) For each index in the current database, the numbers of disk blocks read and buffer hits in that index.
+(relation) For each index in the current database, the table and index OID, schema, table and index name, numbers of disk blocks read and buffer hits in that index.

--- 8.0
+++ 8.1
@@ -1 +1 @@
-(relation) For each sequence object in the current database, the numbers of disk blocks read and buffer hits in that sequence.
+(relation) For each sequence object in the current database, the sequence OID, schema and sequence name, numbers of disk blocks read and buffer hits in that sequence.

--- 8.0
+++ 8.1
@@ -1 +1 @@
-(relation) For each table in the current database, the total number of disk blocks read from that table, the number of buffer hits, the numbers of disk blocks read and buffer hits in all the indexes of that table, the numbers of disk blocks read and buffer hits from the table's auxiliary TOAST table (if any), and the numbers of disk blocks read and buffer hits for the TOAST table's index.
+(relation) For each table in the current database (including TOAST tables), the table OID, schema and table name, number of disk blocks read from that table, number of buffer hits, numbers of disk blocks read and buffer hits in all indexes of that table, numbers of disk blocks read and buffer hits from that table's auxiliary TOAST table (if any), and numbers of disk blocks read and buffer hits for the TOAST table's index.

8.0 → 8.1
~ spcowner  integer → oid

--- 8.0
+++ 8.1
@@ -3,7 +3,7 @@
 tgname: Trigger name (must be unique among triggers of same table)
 tgfoid: The function to be called
 tgtype: Bit mask identifying trigger conditions
-tgenabled: True if trigger is enabled (not presently checked everywhere it should be, so disabling a trigger by setting this false does not work reliably)
+tgenabled: True if trigger is enabled
 tgisconstraint: True if trigger implements a referential integrity constraint
 tgconstrname: Referential integrity constraint name
 tgconstrrelid: The table referenced by an referential integrity constraint

8.0 → 8.1
~ typowner  integer → oid