A checkpoint is now done every MAX_LOG_SIZE / 2 instead of every MAX_LOG_SIZE,…

A checkpoint is now done every MAX_LOG_SIZE / 2 instead of every MAX_LOG_SIZE, so that the transaction log doesn't grow as large.

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

@@ -1439,7 +1439,7 @@ public class PageStore implements CacheWriter {
         openForWriting();
         log.commit(session.getId());
         long size = log.getSize();
-        if (size - logSizeBase > maxLogSize) {
+        if (size - logSizeBase > maxLogSize / 2) {
             int firstSection = log.getLogFirstSectionId();
             checkpoint();
             if (ignoreBigLog) {