Ndb.hpp, Ndb.cpp, ha_ndbcluster.cc:

  Add a check if setting an auto_increment field will change it's next value before retrieving tuple_id_range lock. This avoids hitting locks when updating auto_increment values to a lower value than the current maximum. This is useful in loading a table with auto_increment where one loads the highest numbered pk's first and then proceeds backwards to the first. This can then be achieved with the same performance as a normal insert without auto_increment.
ndb_restore.result:
  Updated result file


mysql-test/suite/ndb/r/ndb_restore.result:
  Updated result file
sql/ha_ndbcluster.cc:
  Add a check if setting an auto_increment field will change it's next value before retrieving tuple_id_range lock. This avoids hitting locks when updating auto_increment values to a lower value than the current maximum. This is useful in loading a table with auto_increment where one loads the highest numbered pk's first and then proceeds backwards to the first. This can then be achieved with the same performance as a normal insert without auto_increment.
storage/ndb/include/ndbapi/Ndb.hpp:
  Add a check if setting an auto_increment field will change it's next value before retrieving tuple_id_range lock. This avoids hitting locks when updating auto_increment values to a lower value than the current maximum. This is useful in loading a table with auto_increment where one loads the highest numbered pk's first and then proceeds backwards to the first. This can then be achieved with the same performance as a normal insert without auto_increment.
storage/ndb/src/ndbapi/Ndb.cpp:
  Add a check if setting an auto_increment field will change it's next value before retrieving tuple_id_range lock. This avoids hitting locks when updating auto_increment values to a lower value than the current maximum. This is useful in loading a table with auto_increment where one loads the highest numbered pk's first and then proceeds backwards to the first. This can then be achieved with the same performance as a normal insert without auto_increment.

mysql-test/suite/ndb/r/ndb_restore.result

@@ -18,12 +18,12 @@ CREATE TABLE `t2_c` (
 PRIMARY KEY  (`capgotod`),
 KEY `i quadaddsvr` (`gotod`)
 ) ENGINE=ndbcluster DEFAULT CHARSET=latin1;
-INSERT INTO `t2_c` VALUES (500,4,'','q3.net','addavp:MK_CASELECTOR=1','postorod rattoaa'),(2,1,'4','','addavp:MK_BRANDTAD=345','REDS Brandtad'),(3,2,'4','q3.net','execorder','fixedRatediPO REDS'),(1,1,'3','','addavp:MK_BRANDTAD=123','TEST Brandtad'),(6,5,'','told.q3.net','addavp:MK_BRANDTAD=123','Brandtad Toldzone'),(4,3,'3','q3.net','addavp:MK_POOLHINT=2','ratedi PO TEST'),(5,0,'',NULL,NULL,'');
+INSERT INTO `t2_c` VALUES (500,4,'','q3.net','addavp:MK_CASELECTOR=1','postorod rattoaa'),(2,1,'4','','addavp:MK_BRANDTAD=345','REDS Brandtad'),(3,2,'4','q3.net','execorder','fixedRatediPO REDS'),(1,1,'3','','addavp:MK_BRANDTAD=123','TEST Brandtad'),(6,5,'','told.q3.net','addavp:MK_BRANDTAD=123','Brandtad Toldzone'),(4,3,'3','q3.net','addavp:MK_POOLHINT=2','ratedi PO TEST');
 CREATE TABLE `t3_c` (
 `CapGoaledatta` smallint(5) unsigned NOT NULL default '0',
 `capgotod` smallint(5) unsigned NOT NULL default '0',
 PRIMARY KEY  (`capgotod`,`CapGoaledatta`)
-) ENGINE=ndbcluster DEFAULT CHARSET=latin1 ROW_FORMAT=FIXED;
+) ENGINE=ndbcluster DEFAULT CHARSET=latin1;
 INSERT INTO `t3_c` VALUES (5,3),(2,4),(5,4),(1,3);
 CREATE TABLE `t4_c` (
 `capfa` bigint(20) unsigned NOT NULL auto_increment,
@@ -116,8 +116,8 @@ CREATE TABLE `t9_c` (
 PRIMARY KEY  (`kattjame`,`hunderaaarbagefa`,`hassetistart`,`hassetino`)
 ) ENGINE=ndbcluster DEFAULT CHARSET=latin1;
 INSERT INTO `t9_c` VALUES ('3g4jh8gar2t','joe','q3.net','elredun.com','q3.net','436643316120','436643316939','91341234568968','695595699','1.1.1.1','2.2.6.2','3','86989','34','x','x','2012-03-12 18:35:04','2012-12-05 12:35:04',3123123,9569,6565,1),('4tt45345235','pap','q3plus.qt','q3plus.qt','q3.net','436643316120','436643316939','8956234534568968','5254595969','1.1.1.1','8.6.2.2','4','86989','34','x','x','2012-03-12 12:55:34','2012-12-05 11:20:04',3223433,3369,9565,2),('4545435545','john','q3.net','q3.net','acne.li','436643316120','436643316939','45345234568968','995696699','1.1.1.1','2.9.9.2','2','86998','34','x','x','2012-03-12 11:35:03','2012-12-05 08:50:04',8823123,169,3565,3);
-CREATE TABLE t10_c (a INT AUTO_INCREMENT KEY) ENGINE=ndbcluster DEFAULT CHARSET=latin1;
-INSERT INTO t10_c VALUES (1),(2),(3);
+create table t10_c (a int auto_increment key) ENGINE=ndbcluster;
+insert into t10_c values (1),(2),(3);
 insert into t10_c values (10000),(2000),(3000);
 create table t1 engine=myisam as select * from t1_c;
 create table t2 engine=myisam as select * from t2_c;
@@ -129,8 +129,6 @@ create table t7 engine=myisam as select * from t7_c;
 create table t8 engine=myisam as select * from t8_c;
 create table t9 engine=myisam as select * from t9_c;
 create table t10 engine=myisam as select * from t10_c;
-ForceVarPart: 0
-ForceVarPart: 1
 CREATE TEMPORARY TABLE IF NOT EXISTS test.backup_info (id INT, backup_id INT) ENGINE = HEAP;
 DELETE FROM test.backup_info;
 LOAD DATA INFILE '../tmp.dat' INTO TABLE test.backup_info FIELDS TERMINATED BY ',';
@@ -138,14 +136,29 @@ SELECT @the_backup_id:=backup_id FROM test.backup_info;
 @the_backup_id:=backup_id
 <the_backup_id>
 DROP TABLE test.backup_info;
-drop table t1_c,t2_c,t3_c,t4_c,t5_c,t6_c,t7_c,t8_c,t9_c,t10_c;
-ForceVarPart: 0
-ForceVarPart: 1
-select * from information_schema.columns where table_name = "t1_c";
-TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	COLUMN_DEFAULT	IS_NULLABLE	DATA_TYPE	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH	NUMERIC_PRECISION	NUMERIC_SCALE	CHARACTER_SET_NAME	COLLATION_NAME	COLUMN_TYPE	COLUMN_KEY	EXTRA	PRIVILEGES	COLUMN_COMMENT
-NULL	test	t1_c	capgoaledatta	1	NULL	NO	mediumint	NULL	NULL	7	0	NULL	NULL	mediumint(5) unsigned	PRI	auto_increment	select,insert,update,references	
-NULL	test	t1_c	goaledatta	2		NO	char	2	2	NULL	NULL	latin1	latin1_swedish_ci	char(2)	PRI		select,insert,update,references	
-NULL	test	t1_c	maturegarbagefa	3		NO	varchar	32	32	NULL	NULL	latin1	latin1_swedish_ci	varchar(32)	PRI		select,insert,update,references	
+drop table t1_c,t2_c,t3_c,t4_c,t5_c,t6_c,t7_c,t8_c,t9_c, t10_c;
+show tables;
+Tables_in_test
+t1
+t10
+t2
+t3
+t4
+t5
+t6
+t7
+t8
+t9
+t4_c
+t3_c
+t2_c
+t5_c
+t6_c
+t7_c
+t8_c
+t9_c
+t10_c
+t1_c
 select count(*) from t1;
 count(*)
 5
@@ -159,15 +172,15 @@ count(*)
 5
 select count(*) from t2;
 count(*)
-7
+6
 select count(*) from t2_c;
 count(*)
-7
+6
 select count(*)
 from (select * from t2 union 
 select * from t2_c) a;
 count(*)
-7
+6
 select count(*) from t3;
 count(*)
 4
@@ -253,238 +266,41 @@ a
 2000
 3000
 10000
-show table status like 't1_c';
-Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-X	X	X	X	X	X	X	X	X	X	3001	X	X	X	X	X	X	X
-show table status like 't2_c';
-Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-X	X	X	X	X	X	X	X	X	X	501	X	X	X	X	X	X	X
-show table status like 't4_c';
-Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-X	X	X	X	X	X	X	X	X	X	290000001	X	X	X	X	X	X	X
-show table status like 't7_c';
-Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-X	X	X	X	X	X	X	X	X	X	29	X	X	X	X	X	X	X
-show table status like 't10_c';
-Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-X	X	X	X	X	X	X	X	X	X	10001	X	X	X	X	X	X	X
-ALTER TABLE t7_c
-PARTITION BY LINEAR KEY (`dardtestard`);
-CREATE TEMPORARY TABLE IF NOT EXISTS test.backup_info (id INT, backup_id INT) ENGINE = HEAP;
-DELETE FROM test.backup_info;
-LOAD DATA INFILE '../tmp.dat' INTO TABLE test.backup_info FIELDS TERMINATED BY ',';
-SELECT @the_backup_id:=backup_id FROM test.backup_info;
-@the_backup_id:=backup_id
-<the_backup_id>
-DROP TABLE test.backup_info;
-drop table t1_c,t2_c,t3_c,t4_c,t5_c,t6_c,t7_c,t8_c,t9_c,t10_c;
-select count(*) from t1;
-count(*)
-5
-select count(*) from t1_c;
-count(*)
-5
-select count(*)
-from (select * from t1 union 
-select * from t1_c) a;
-count(*)
-5
-select count(*) from t2;
-count(*)
-7
-select count(*) from t2_c;
-count(*)
-7
-select count(*)
-from (select * from t2 union 
-select * from t2_c) a;
-count(*)
-7
-select count(*) from t3;
-count(*)
-4
-select count(*) from t3_c;
-count(*)
-4
-select count(*)
-from (select * from t3 union 
-select * from t3_c) a;
-count(*)
-4
-select count(*) from t4;
-count(*)
-22
-select count(*) from t4_c;
-count(*)
-22
-select count(*)
-from (select * from t4 union 
-select * from t4_c) a;
-count(*)
-22
-select count(*) from t5;
-count(*)
-3
-select count(*) from t5_c;
-count(*)
-3
-select count(*)
-from (select * from t5 union 
-select * from t5_c) a;
-count(*)
-3
-select count(*) from t6;
-count(*)
-8
-select count(*) from t6_c;
-count(*)
-8
-select count(*)
-from (select * from t6 union 
-select * from t6_c) a;
-count(*)
-8
-select count(*) from t7;
-count(*)
-5
-select count(*) from t7_c;
-count(*)
-5
-select count(*)
-from (select * from t7 union 
-select * from t7_c) a;
-count(*)
-5
-select count(*) from t8;
-count(*)
-3
-select count(*) from t8_c;
-count(*)
-3
-select count(*)
-from (select * from t8 union 
-select * from t8_c) a;
-count(*)
-3
-select count(*) from t9;
-count(*)
-3
-select count(*) from t9_c;
-count(*)
-3
-select count(*)
-from (select * from t9 union 
-select * from t9_c) a;
-count(*)
-3
-drop table t1_c,t2_c,t3_c,t4_c,t5_c,t6_c,t7_c,t8_c,t9_c,t10_c;
-select count(*) from t1;
-count(*)
-5
-select count(*) from t1_c;
-count(*)
-5
-select count(*)
-from (select * from t1 union 
-select * from t1_c) a;
-count(*)
-5
-select count(*) from t2;
-count(*)
-7
-select count(*) from t2_c;
-count(*)
-7
-select count(*)
-from (select * from t2 union 
-select * from t2_c) a;
-count(*)
-7
-select count(*) from t3;
-count(*)
-4
-select count(*) from t3_c;
-count(*)
-4
-select count(*)
-from (select * from t3 union 
-select * from t3_c) a;
-count(*)
-4
-select count(*) from t4;
-count(*)
-22
-select count(*) from t4_c;
-count(*)
-22
-select count(*)
-from (select * from t4 union 
-select * from t4_c) a;
-count(*)
-22
-select count(*) from t5;
-count(*)
-3
-select count(*) from t5_c;
-count(*)
-3
-select count(*)
-from (select * from t5 union 
-select * from t5_c) a;
-count(*)
-3
-select count(*) from t6;
-count(*)
-8
-select count(*) from t6_c;
-count(*)
-8
-select count(*)
-from (select * from t6 union 
-select * from t6_c) a;
-count(*)
-8
-select count(*) from t7;
-count(*)
-5
-select count(*) from t7_c;
-count(*)
-5
-select count(*)
-from (select * from t7 union 
-select * from t7_c) a;
-count(*)
-5
-select count(*) from t8;
-count(*)
-3
-select count(*) from t8_c;
-count(*)
-3
-select count(*)
-from (select * from t8 union 
-select * from t8_c) a;
-count(*)
-3
-select count(*) from t9;
-count(*)
-3
-select count(*) from t9_c;
-count(*)
-3
-select count(*)
-from (select * from t9 union 
-select * from t9_c) a;
-count(*)
-3
-drop table t1_c,t3_c,t4_c,t5_c,t6_c,t7_c,t8_c,t9_c,t10_c;
-CREATE TEMPORARY TABLE IF NOT EXISTS test.backup_info (id INT, backup_id INT) ENGINE = HEAP;
-DELETE FROM test.backup_info;
-LOAD DATA INFILE '../tmp.dat' INTO TABLE test.backup_info FIELDS TERMINATED BY ',';
-SELECT @the_backup_id:=backup_id FROM test.backup_info;
-@the_backup_id:=backup_id
-<the_backup_id>
-DROP TABLE test.backup_info;
-drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9,t10;
-drop table if exists t2_c;
+select max(capgoaledatta) from t1_c;
+max(capgoaledatta)
+3000
+select auto_increment from information_schema.tables
+where table_name = 't1_c';
+auto_increment
+3001
+select max(capgotod) from t2_c;
+max(capgotod)
+500
+select auto_increment from information_schema.tables
+where table_name = 't2_c';
+auto_increment
+501
+select max(capfa) from t4_c;
+max(capfa)
+290000000
+select auto_increment from information_schema.tables
+where table_name = 't4_c';
+auto_increment
+290000001
+select max(dardtestard) from t7_c;
+max(dardtestard)
+28
+select auto_increment from information_schema.tables
+where table_name = 't7_c';
+auto_increment
+29
+select max(a) from t10_c;
+max(a)
+10000
+select auto_increment from information_schema.tables
+where table_name = 't10_c';
+auto_increment
+10001
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9, t10;
+drop table if exists t1_c,t2_c,t3_c,t4_c,t5_c,t6_c,t7_c,t8_c,t9_c, t10_c;
 520093696,<the_backup_id>

sql/ha_ndbcluster.cc

@@ -2738,10 +2738,13 @@ ha_ndbcluster::set_auto_inc(Field *field)
              ("Trying to set next auto increment value to %s",
               llstr(next_val, buff)));
 #endif
-  Ndb_tuple_id_range_guard g(m_share);
-  if (ndb->setAutoIncrementValue(m_table, g.range, next_val, TRUE)
-      == -1)
-    ERR_RETURN(ndb->getNdbError());
+  if (ndb->checkUpdateAutoIncrementValue(m_share->tuple_id_range, next_val))
+  {
+    Ndb_tuple_id_range_guard g(m_share);
+    if (ndb->setAutoIncrementValue(m_table, g.range, next_val, TRUE)
+        == -1)
+      ERR_RETURN(ndb->getNdbError());
+  }
   DBUG_RETURN(0);
 }
 

storage/ndb/include/ndbapi/Ndb.hpp

@@ -1515,37 +1515,40 @@ public:
     TupleIdRange() {}
     Uint64 m_first_tuple_id;
     Uint64 m_last_tuple_id;
+    Uint64 m_highest_seen;
     void reset() {
       m_first_tuple_id = ~(Uint64)0;
       m_last_tuple_id = ~(Uint64)0;
+      m_highest_seen = 0;
     };
   };
 
   int initAutoIncrement();
 
   int getAutoIncrementValue(const char* aTableName, 
-                            Uint64 & tupleId, Uint32 cacheSize,
+                            Uint64 & autoValue, Uint32 cacheSize,
                             Uint64 step = 1, Uint64 start = 1);
   int getAutoIncrementValue(const NdbDictionary::Table * aTable, 
-                            Uint64 & tupleId, Uint32 cacheSize,
+                            Uint64 & autoValue, Uint32 cacheSize,
                             Uint64 step = 1, Uint64 start = 1);
   int getAutoIncrementValue(const NdbDictionary::Table * aTable, 
-                            TupleIdRange & range, Uint64 & tupleId,
+                            TupleIdRange & range, Uint64 & autoValue,
                             Uint32 cacheSize,
                             Uint64 step = 1, Uint64 start = 1);
   int readAutoIncrementValue(const char* aTableName,
-                             Uint64 & tupleId);
+                             Uint64 & autoValue);
   int readAutoIncrementValue(const NdbDictionary::Table * aTable,
-                             Uint64 & tupleId);
+                             Uint64 & autoValue);
   int readAutoIncrementValue(const NdbDictionary::Table * aTable,
-                             TupleIdRange & range, Uint64 & tupleId);
+                             TupleIdRange & range, Uint64 & autoValue);
   int setAutoIncrementValue(const char* aTableName,
-                            Uint64 tupleId, bool modify);
+                            Uint64 autoValue, bool modify);
   int setAutoIncrementValue(const NdbDictionary::Table * aTable,
-                            Uint64 tupleId, bool modify);
+                            Uint64 autoValue, bool modify);
   int setAutoIncrementValue(const NdbDictionary::Table * aTable,
-                            TupleIdRange & range, Uint64 tupleId,
+                            TupleIdRange & range, Uint64 autoValue,
                             bool modify);
+  bool checkUpdateAutoIncrementValue(TupleIdRange & range, Uint64 autoValue);
 private:
   int getTupleIdFromNdb(const NdbTableImpl* table,
                         TupleIdRange & range, Uint64 & tupleId,
@@ -1554,6 +1557,8 @@ private:
                          TupleIdRange & range, Uint64 & tupleId);
   int setTupleIdInNdb(const NdbTableImpl* table,
                       TupleIdRange & range, Uint64 tupleId, bool modify);
+  int checkTupleIdInNdb(TupleIdRange & range,
+                        Uint64 tupleId);
   int opTupleIdOnNdb(const NdbTableImpl* table,
                      TupleIdRange & range, Uint64 & opValue, Uint32 op);
 public:

storage/ndb/src/ndbapi/Ndb.cpp

@@ -942,6 +942,7 @@ Parameters:     aTableName (IN) : The table name.
                 step       (IN) : Specifies the step between the 
                                   autoincrement values.
                 start      (IN) : Start value for first value
+Returns:        0 if succesful, -1 if error encountered
 Remark:		Returns a new autoincrement value to the application.
                 The autoincrement values can be increased by steps
                 (default 1) and a number of values can be prefetched
@@ -1072,9 +1073,18 @@ Ndb::getTupleIdFromNdb(const NdbTableImpl* table,
   DBUG_RETURN(0);
 }
 
+/****************************************************************************
+int readAutoIncrementValue( const char* aTableName,
+                            Uint64 & autoValue);
+
+Parameters:     aTableName (IN) : The table name.
+                autoValue  (OUT) : The current autoincrement value
+Returns:        0 if succesful, -1 if error encountered
+Remark:         Returns the current autoincrement value to the application.
+****************************************************************************/
 int
 Ndb::readAutoIncrementValue(const char* aTableName,
-                            Uint64 & tupleId)
+                            Uint64 & autoValue)
 {
   DBUG_ENTER("Ndb::readAutoIncrementValue");
   ASSERT_NOT_MYSQLD;
@@ -1088,15 +1098,15 @@ Ndb::readAutoIncrementValue(const char* aTableName,
   }
   const NdbTableImpl* table = info->m_table_impl;
   TupleIdRange & range = info->m_tuple_id_range;
-  if (readTupleIdFromNdb(table, range, tupleId) == -1)
+  if (readTupleIdFromNdb(table, range, autoValue) == -1)
     DBUG_RETURN(-1);
-  DBUG_PRINT("info", ("value %lu", (ulong)tupleId));
+  DBUG_PRINT("info", ("value %lu", (ulong)autoValue));
   DBUG_RETURN(0);
 }
 
 int
 Ndb::readAutoIncrementValue(const NdbDictionary::Table * aTable,
-                            Uint64 & tupleId)
+                            Uint64 & autoValue)
 {
   DBUG_ENTER("Ndb::readAutoIncrementValue");
   ASSERT_NOT_MYSQLD;
@@ -1111,23 +1121,23 @@ Ndb::readAutoIncrementValue(const NdbDictionary::Table * aTable,
     DBUG_RETURN(-1);
   }
   TupleIdRange & range = info->m_tuple_id_range;
-  if (readTupleIdFromNdb(table, range, tupleId) == -1)
+  if (readTupleIdFromNdb(table, range, autoValue) == -1)
     DBUG_RETURN(-1);
-  DBUG_PRINT("info", ("value %lu", (ulong)tupleId));
+  DBUG_PRINT("info", ("value %lu", (ulong)autoValue));
   DBUG_RETURN(0);
 }
 
 int
 Ndb::readAutoIncrementValue(const NdbDictionary::Table * aTable,
-                            TupleIdRange & range, Uint64 & tupleId)
+                            TupleIdRange & range, Uint64 & autoValue)
 {
   DBUG_ENTER("Ndb::readAutoIncrementValue");
   assert(aTable != 0);
   const NdbTableImpl* table = & NdbTableImpl::getImpl(*aTable);
 
-  if (readTupleIdFromNdb(table, range, tupleId) == -1)
+  if (readTupleIdFromNdb(table, range, autoValue) == -1)
     DBUG_RETURN(-1);
-  DBUG_PRINT("info", ("value %lu", (ulong)tupleId));
+  DBUG_PRINT("info", ("value %lu", (ulong)autoValue));
   DBUG_RETURN(0);
 }
 
@@ -1155,9 +1165,20 @@ Ndb::readTupleIdFromNdb(const NdbTableImpl* table,
   DBUG_RETURN(0);
 }
 
+/****************************************************************************
+int setAutoIncrementValue( const char* aTableName,
+                           Uint64 autoValue,
+                           bool modify);
+
+Parameters:     aTableName (IN) : The table name.
+                autoValue  (IN) : The new autoincrement value
+                modify     (IN) : Modify existing value (not initialization)
+Returns:        0 if succesful, -1 if error encountered
+Remark:         Sets a new autoincrement value for the application.
+****************************************************************************/
 int
 Ndb::setAutoIncrementValue(const char* aTableName,
-                           Uint64 tupleId, bool increase)
+                           Uint64 autoValue, bool modify)
 {
   DBUG_ENTER("Ndb::setAutoIncrementValue");
   ASSERT_NOT_MYSQLD;
@@ -1171,14 +1192,14 @@ Ndb::setAutoIncrementValue(const char* aTableName,
   }
   const NdbTableImpl* table = info->m_table_impl;
   TupleIdRange & range = info->m_tuple_id_range;
-  if (setTupleIdInNdb(table, range, tupleId, increase) == -1)
+  if (setTupleIdInNdb(table, range, autoValue, modify) == -1)
     DBUG_RETURN(-1);
   DBUG_RETURN(0);
 }
 
 int
 Ndb::setAutoIncrementValue(const NdbDictionary::Table * aTable,
-                           Uint64 tupleId, bool increase)
+                           Uint64 autoValue, bool modify)
 {
   DBUG_ENTER("Ndb::setAutoIncrementValue");
   ASSERT_NOT_MYSQLD;
@@ -1193,52 +1214,55 @@ Ndb::setAutoIncrementValue(const NdbDictionary::Table * aTable,
     DBUG_RETURN(-1);
   }
   TupleIdRange & range = info->m_tuple_id_range;
-  if (setTupleIdInNdb(table, range, tupleId, increase) == -1)
+  if (setTupleIdInNdb(table, range, autoValue, modify) == -1)
     DBUG_RETURN(-1);
   DBUG_RETURN(0);
 }
 
 int
 Ndb::setAutoIncrementValue(const NdbDictionary::Table * aTable,
-                           TupleIdRange & range, Uint64 tupleId,
-                           bool increase)
+                           TupleIdRange & range, Uint64 autoValue,
+                           bool modify)
 {
   DBUG_ENTER("Ndb::setAutoIncrementValue");
   assert(aTable != 0);
   const NdbTableImpl* table = & NdbTableImpl::getImpl(*aTable);
 
-  if (setTupleIdInNdb(table, range, tupleId, increase) == -1)
+  if (setTupleIdInNdb(table, range, autoValue, modify) == -1)
     DBUG_RETURN(-1);
   DBUG_RETURN(0);
 }
 
 int
 Ndb::setTupleIdInNdb(const NdbTableImpl* table,
-                     TupleIdRange & range, Uint64 tupleId, bool increase)
+                     TupleIdRange & range, Uint64 tupleId, bool modify)
 {
   DBUG_ENTER("Ndb::setTupleIdInNdb");
-  if (increase)
+  if (modify)
   {
-    if (range.m_first_tuple_id != range.m_last_tuple_id)
+    if (checkTupleIdInNdb(range, tupleId))
     {
-      assert(range.m_first_tuple_id < range.m_last_tuple_id);
-      if (tupleId <= range.m_first_tuple_id + 1)
-	DBUG_RETURN(0);
-      if (tupleId <= range.m_last_tuple_id)
+      if (range.m_first_tuple_id != range.m_last_tuple_id)
       {
-	range.m_first_tuple_id = tupleId - 1;
-        DBUG_PRINT("info", 
-                   ("Setting next auto increment cached value to %lu",
-                    (ulong)tupleId));  
-	DBUG_RETURN(0);
+        assert(range.m_first_tuple_id < range.m_last_tuple_id);
+        if (tupleId <= range.m_first_tuple_id + 1)
+          DBUG_RETURN(0);
+        if (tupleId <= range.m_last_tuple_id)
+        {
+          range.m_first_tuple_id = tupleId - 1;
+          DBUG_PRINT("info", 
+                     ("Setting next auto increment cached value to %lu",
+                      (ulong)tupleId));  
+          DBUG_RETURN(0);
+        }
       }
+      /*
+       * if tupleId <= NEXTID, do nothing.  otherwise update NEXTID to
+       * tupleId and set cached range to first = last = tupleId - 1.
+       */
+      if (opTupleIdOnNdb(table, range, tupleId, 2) == -1)
+        DBUG_RETURN(-1);
     }
-    /*
-     * if tupleId <= NEXTID, do nothing.  otherwise update NEXTID to
-     * tupleId and set cached range to first = last = tupleId - 1.
-     */
-    if (opTupleIdOnNdb(table, range, tupleId, 2) == -1)
-      DBUG_RETURN(-1);
   }
   else
   {
@@ -1277,6 +1301,39 @@ int Ndb::initAutoIncrement()
   return 0;
 }
 
+bool
+Ndb::checkUpdateAutoIncrementValue(TupleIdRange & range, Uint64 autoValue)
+{
+  return(checkTupleIdInNdb(range, autoValue) != 0);
+}
+
+int
+Ndb::checkTupleIdInNdb(TupleIdRange & range, Uint64 tupleId)
+{
+  DBUG_ENTER("Ndb::checkTupleIdIndNdb");
+  if ((range.m_first_tuple_id != ~(Uint64)0) &&
+      (range.m_first_tuple_id > tupleId))
+  {
+   /*
+    * If we have ever cached a value in this object and this cached
+    * value is larger than the value we're trying to set then we
+    * need not check with the real value in the SYSTAB_0 table.
+    */
+    DBUG_RETURN(0);
+  }
+  if (range.m_highest_seen > tupleId)
+  {
+    /*
+     * Although we've never cached any higher value we have read
+     * a higher value and again it isn't necessary to change the
+     * auto increment value.
+     */
+    DBUG_RETURN(0);
+  }
+  DBUG_RETURN(1);
+}
+
+
 int
 Ndb::opTupleIdOnNdb(const NdbTableImpl* table,
                     TupleIdRange & range, Uint64 & opValue, Uint32 op)