change the PageStore#changeCount field from an int to a long, to cope with…

change the PageStore#changeCount field from an int to a long, to cope with databases with very high transaction rates.

h2/src/docsrc/html/changelog.html

@@ -46,6 +46,7 @@ Change Log
 </li><li>Issue 481: Further extensions to PgServer to support better support PG JDBC, patch from Andrew Franklin.
 </li><li>Add support for spatial datatype GEOMETRY.
 </li><li>Add support for in-memory spatial index.
+</li><li>change the PageStore#changeCount field from an int to a long, to cope with databases with very high transaction rates.
 </li></ul>
 
 <h2>Version 1.3.172 (2013-05-25)</h2>

h2/src/main/org/h2/store/Page.java

@@ -74,7 +74,7 @@ public abstract class Page extends CacheObject {
     /**
      * When this page was changed the last time.
      */
-    protected int changeCount;
+    protected long changeCount;
 
     /**
      * Copy the data to a new location, change the parent to point to the new

h2/src/main/org/h2/store/PageStore.java

@@ -193,7 +193,7 @@ public class PageStore implements CacheWriter {
      * when using a very small cache size. The value starts at 1 so that
      * pages with change count 0 can be evicted from the cache.
      */
-    private int changeCount = 1;
+    private long changeCount = 1;
 
     private Data emptyPage;
     private long logSizeBase;
@@ -1960,7 +1960,7 @@ public class PageStore implements CacheWriter {
      *
      * @return the change count
      */
-    public int getChangeCount() {
+    public long getChangeCount() {
         return changeCount;
     }