Rename max_predicate_locks_per_transaction.

The new name, max_pred_locks_per_transaction, is shorter.

Kevin Grittner, per discussion.

Author: robertmhaas

doc/src/sgml/config.sgml

@@ -5188,15 +5188,15 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
       </listitem>
      </varlistentry>
 
-     <varlistentry id="guc-max-predicate-locks-per-transaction" xreflabel="max_predicate_locks_per_transaction">
-      <term><varname>max_predicate_locks_per_transaction</varname> (<type>integer</type>)</term>
+     <varlistentry id="guc-max-pred-locks-per-transaction" xreflabel="max_pred_locks_per_transaction">
+      <term><varname>max_pred_locks_per_transaction</varname> (<type>integer</type>)</term>
       <indexterm>
-       <primary><varname>max_predicate_locks_per_transaction</> configuration parameter</primary>
+       <primary><varname>max_pred_locks_per_transaction</> configuration parameter</primary>
       </indexterm>
       <listitem>
        <para>
         The shared predicate lock table tracks locks on
-        <varname>max_predicate_locks_per_transaction</varname> * (<xref
+        <varname>max_pred_locks_per_transaction</varname> * (<xref
         linkend="guc-max-connections"> + <xref
         linkend="guc-max-prepared-transactions">) objects (e.g., tables);
         hence, no more than this many distinct objects can be locked at

src/backend/storage/lmgr/predicate.c

@@ -1874,7 +1874,7 @@ DeleteChildTargetLocks(const PREDICATELOCKTARGETTAG *newtargettag)
  * thresholds are, either making it proportional to the number of
  * tuples in a page & pages in a relation, or at least making it a
  * GUC. Currently the threshold is 3 for a page lock, and
- * max_predicate_locks_per_transaction/2 for a relation lock, chosen
+ * max_pred_locks_per_transaction/2 for a relation lock, chosen
  * entirely arbitrarily (and without benchmarking).
  */
 static int
@@ -2063,7 +2063,7 @@ CreatePredicateLock(const PREDICATELOCKTARGETTAG *targettag,
 		ereport(ERROR,
 				(errcode(ERRCODE_OUT_OF_MEMORY),
 				 errmsg("out of shared memory"),
-				 errhint("You might need to increase max_predicate_locks_per_transaction.")));
+				 errhint("You might need to increase max_pred_locks_per_transaction.")));
 	if (!found)
 	{
 		SHMQueueInit(&(target->predicateLocks));
@@ -2082,7 +2082,7 @@ CreatePredicateLock(const PREDICATELOCKTARGETTAG *targettag,
 		ereport(ERROR,
 				(errcode(ERRCODE_OUT_OF_MEMORY),
 				 errmsg("out of shared memory"),
-				 errhint("You might need to increase max_predicate_locks_per_transaction.")));
+				 errhint("You might need to increase max_pred_locks_per_transaction.")));
 
 	if (!found)
 	{
@@ -2341,7 +2341,7 @@ PredicateLockTupleRowVersionLink(const Relation relation,
 			ereport(ERROR,
 					(errcode(ERRCODE_OUT_OF_MEMORY),
 					 errmsg("out of shared memory"),
-					 errhint("You might need to increase max_predicate_locks_per_transaction.")));
+					 errhint("You might need to increase max_pred_locks_per_transaction.")));
 		if (!found)
 		{
 			SHMQueueInit(&(newtarget->predicateLocks));
@@ -3337,7 +3337,7 @@ ReleaseOneSerializableXact(SERIALIZABLEXACT *sxact, bool partial,
 				ereport(ERROR,
 						(errcode(ERRCODE_OUT_OF_MEMORY),
 						 errmsg("out of shared memory"),
-						 errhint("You might need to increase max_predicate_locks_per_transaction.")));
+						 errhint("You might need to increase max_pred_locks_per_transaction.")));
 			if (found)
 			{
 				if (predlock->commitSeqNo < sxact->commitSeqNo)

src/backend/utils/misc/guc.c

@@ -1725,10 +1725,10 @@ static struct config_int ConfigureNamesInt[] =
 	},
 
 	{
-		{"max_predicate_locks_per_transaction", PGC_POSTMASTER, LOCK_MANAGEMENT,
+		{"max_pred_locks_per_transaction", PGC_POSTMASTER, LOCK_MANAGEMENT,
 			gettext_noop("Sets the maximum number of predicate locks per transaction."),
 			gettext_noop("The shared predicate lock table is sized on the assumption that "
-			  "at most max_predicate_locks_per_transaction * max_connections distinct "
+			  "at most max_pred_locks_per_transaction * max_connections distinct "
 						 "objects will need to be locked at any one time.")
 		},
 		&max_predicate_locks_per_xact,

src/backend/utils/misc/postgresql.conf.sample

@@ -503,7 +503,7 @@
 # Note:  Each lock table slot uses ~270 bytes of shared memory, and there are
 # max_locks_per_transaction * (max_connections + max_prepared_transactions)
 # lock table slots.
-#max_predicate_locks_per_transaction = 64	# min 10
+#max_pred_locks_per_transaction = 64	# min 10
 					# (change requires restart)
 
 #------------------------------------------------------------------------------