diff --git a/commons/src/main/java/org/archive/util/bdbje/EnhancedEnvironment.java b/commons/src/main/java/org/archive/util/bdbje/EnhancedEnvironment.java
index cb28ce58..f9c974ba 100644
--- a/commons/src/main/java/org/archive/util/bdbje/EnhancedEnvironment.java
+++ b/commons/src/main/java/org/archive/util/bdbje/EnhancedEnvironment.java
@@ -59,6 +59,7 @@ public class EnhancedEnvironment extends Environment {
         if(classCatalog == null) {
             DatabaseConfig dbConfig = new DatabaseConfig();
             dbConfig.setAllowCreate(true);
+            dbConfig.setReadOnly(this.getConfig().getReadOnly());
             try {
                 classCatalogDB = openDatabase(null, "classCatalog", dbConfig);
                 classCatalog = new StoredClassCatalog(classCatalogDB);
diff --git a/modules/src/main/java/org/archive/modules/recrawl/PersistLoadProcessor.java b/modules/src/main/java/org/archive/modules/recrawl/PersistLoadProcessor.java
index 9de2cb48..841ba858 100644
--- a/modules/src/main/java/org/archive/modules/recrawl/PersistLoadProcessor.java
+++ b/modules/src/main/java/org/archive/modules/recrawl/PersistLoadProcessor.java
@@ -74,6 +74,7 @@ public class PersistLoadProcessor extends PersistOnlineProcessor {
         	(Map<String,Object>) store.get(pkey);
         if(prior!=null) {
             // merge in keys
+            prior.keySet().removeAll(curi.getData().keySet());
             curi.getData().putAll(prior); 
         }
     }
diff --git a/modules/src/main/java/org/archive/modules/recrawl/PersistProcessor.java b/modules/src/main/java/org/archive/modules/recrawl/PersistProcessor.java
index 05cd5853..b422e0ad 100644
--- a/modules/src/main/java/org/archive/modules/recrawl/PersistProcessor.java
+++ b/modules/src/main/java/org/archive/modules/recrawl/PersistProcessor.java
@@ -52,6 +52,7 @@ import com.sleepycat.bind.tuple.StringBinding;
 import com.sleepycat.collections.StoredIterator;
 import com.sleepycat.collections.StoredSortedMap;
 import com.sleepycat.je.Database;
+import com.sleepycat.je.DatabaseConfig;
 import com.sleepycat.je.DatabaseException;
 import com.sleepycat.je.EnvironmentConfig;
 
@@ -142,8 +143,10 @@ public abstract class PersistProcessor extends Processor {
         // open the source env history DB, copying entries to target env
         EnhancedEnvironment sourceEnv = setupEnvironment(sourceDir, true);
         StoredClassCatalog sourceClassCatalog = sourceEnv.getClassCatalog();
+        DatabaseConfig historyDbConfig = HISTORY_DB_CONFIG.toDatabaseConfig();
+        historyDbConfig.setReadOnly(true);
         Database sourceHistoryDB = sourceEnv.openDatabase(
-                null, URI_HISTORY_DBNAME, HISTORY_DB_CONFIG.toDatabaseConfig());
+                null, URI_HISTORY_DBNAME, historyDbConfig);
         StoredSortedMap<String,Map> sourceHistoryMap = new StoredSortedMap<String,Map>(sourceHistoryDB,
                 new StringBinding(), new SerialBinding<Map>(sourceClassCatalog,
                         Map.class), true);
@@ -351,6 +354,7 @@ public abstract class PersistProcessor extends Processor {
         EnvironmentConfig envConfig = new EnvironmentConfig();
         envConfig.setAllowCreate(true);
         envConfig.setReadOnly(readOnly); 
+        envConfig.setConfigParam("je.log.faultReadSize", "6144");
         return new EnhancedEnvironment(env, envConfig);
     }
 }
\ No newline at end of file