Page store: a rollback of a relatively large transaction could fail.

h2/src/main/org/h2/log/UndoLogRecord.java

@@ -90,7 +90,6 @@ public class UndoLogRecord {
             if (state == IN_MEMORY_INVALID) {
                 if (!db.isPageStoreEnabled()) {
                     Index index = table.getUniqueIndex();
-                    row.setPos(0);
                     Cursor cursor = index.find(session, row, row);
                     cursor.next();
                     // can not just set the position, because the row

h2/src/test/org/h2/test/db/TestMemoryUsage.java

@@ -139,7 +139,7 @@ public class TestMemoryUsage extends TestBase {
         System.gc();
         System.gc();
         int used = MemoryUtils.getMemoryUsed();
-        if ((used - start) > 7500) {
+        if ((used - start) > getSize(7500, 12000)) {
             fail("Used: " + (used - start));
         }
         stat.execute("drop table test");