diff --git a/dbcon/ddlpackageproc/altertableprocessor.cpp b/dbcon/ddlpackageproc/altertableprocessor.cpp
index 29edd1112..f250da133 100644
--- a/dbcon/ddlpackageproc/altertableprocessor.cpp
+++ b/dbcon/ddlpackageproc/altertableprocessor.cpp
@@ -762,7 +762,7 @@ void AlterTableProcessor::addColumn(uint32_t sessionID, execplan::CalpontSystemC
   int pmNum = 1;
   OamCache* oamcache = OamCache::makeOamCache();
   //boost::shared_ptr<std::map<int, std::set<int>> > dbRootPMMap = oamcache->getDBRootToPMMap();
-  pmNum = oamcache->getOwnerPM(); //*(*dbRootPMMap)[dbRoot].begin();
+  pmNum = oamcache->getOwnerPM(dbRoot); //*(*dbRootPMMap)[dbRoot].begin();
 
   boost::shared_ptr<messageqcpp::ByteStream> bsIn;
   // Will create files on each PM as needed.
@@ -925,7 +925,7 @@ void AlterTableProcessor::addColumn(uint32_t sessionID, execplan::CalpontSystemC
       if (rc != 0)
         throw std::runtime_error("Error while calling getSysCatDBRoot ");
 
-      pmNum = *(*dbRootPMMap)[dbRoot].begin();
+      pmNum = oamcache->getOwnerPM(dbRoot);
       bs.restart();
       bs << (ByteStream::byte)WE_SVR_UPDATE_SYSTABLE_AUTO;
       bs << uniqueId;
@@ -1379,7 +1379,7 @@ void AlterTableProcessor::dropColumn(uint32_t sessionID, execplan::CalpontSystem
     if (rc != 0)
       throw std::runtime_error("Error while calling getSysCatDBRoot ");
 
-    pmNum = *(*dbRootPMMap)[dbRoot].begin();
+    pmNum = oamcache->getOwnerPM(dbRoot);
     bytestream.restart();
     bytestream << (ByteStream::byte)WE_SVR_UPDATE_SYSTABLE_AUTO;
     bytestream << uniqueId;
@@ -1452,7 +1452,7 @@ void AlterTableProcessor::dropColumn(uint32_t sessionID, execplan::CalpontSystem
   if (rc != 0)
     throw std::runtime_error("Error while calling getSysCatDBRoot ");
 
-  pmNum = *(*dbRootPMMap)[dbRoot].begin();
+  pmNum = oamcache->getOwnerPM(dbRoot);
 
   try
   {
@@ -1707,7 +1707,7 @@ void AlterTableProcessor::setColumnDefault(uint32_t sessionID, execplan::Calpont
   int pmNum = 1;
   OamCache* oamcache = OamCache::makeOamCache();
   //boost::shared_ptr<std::map<int, std::set<int>> > dbRootPMMap = oamcache->getDBRootToPMMap();
-  pmNum = oamcacne->getOwnerPM(dbRoot); //*(*dbRootPMMap)[dbRoot].begin();
+  pmNum = oamcache->getOwnerPM(dbRoot); //*(*dbRootPMMap)[dbRoot].begin();
 
   boost::shared_ptr<messageqcpp::ByteStream> bsIn;
 
@@ -2540,7 +2540,7 @@ void AlterTableProcessor::renameColumn(uint32_t sessionID, execplan::CalpontSyst
     if (rc != 0)
       throw std::runtime_error("Error while calling getSysCatDBRoot");
 
-    pmNum = *(*dbRootPMMap)[dbRoot].begin();
+    pmNum = oamcache->getOwnerPM(dbRoot);
 
     // send to WES to process
     try
diff --git a/dbcon/ddlpackageproc/createtableprocessor.cpp b/dbcon/ddlpackageproc/createtableprocessor.cpp
index 0b9f68f00..cd61df7a8 100644
--- a/dbcon/ddlpackageproc/createtableprocessor.cpp
+++ b/dbcon/ddlpackageproc/createtableprocessor.cpp
@@ -326,8 +326,7 @@ CreateTableProcessor::DDLResult CreateTableProcessor::processPackageInternal(
     bytestream << (uint32_t)dbRoot;
     tableDef.serialize(bytestream);
     boost::shared_ptr<messageqcpp::ByteStream> bsIn;
-    boost::shared_ptr<std::map<int, int> > dbRootPMMap = oamcache->getDBRootToPMMap();
-    pmNum = (*dbRootPMMap)[dbRoot];
+    pmNum = oamcache->getOwnerPM(dbRoot);
     // MCOL-66 The DBRM can't handle concurrent DDL
     boost::mutex::scoped_lock lk(dbrmMutex);
 
@@ -450,7 +449,7 @@ CreateTableProcessor::DDLResult CreateTableProcessor::processPackageInternal(
 
     bytestream << (uint32_t)dbRoot;
     tableDef.serialize(bytestream);
-    pmNum = (*dbRootPMMap)[dbRoot];
+    pmNum = oamcache->getOwnerPM(dbRoot);
 
     try
     {
@@ -666,7 +665,7 @@ CreateTableProcessor::DDLResult CreateTableProcessor::processPackageInternal(
       return result;
     }
 
-    pmNum = (*dbRootPMMap)[useDBRoot];
+    pmNum = oamcache->getOwnerPM(useDBRoot);
 
     try
     {
diff --git a/dbcon/ddlpackageproc/droptableprocessor.cpp b/dbcon/ddlpackageproc/droptableprocessor.cpp
index faa28b721..3720dbb5f 100644
--- a/dbcon/ddlpackageproc/droptableprocessor.cpp
+++ b/dbcon/ddlpackageproc/droptableprocessor.cpp
@@ -359,8 +359,7 @@ DropTableProcessor::DDLResult DropTableProcessor::processPackageInternal(ddlpack
       return result;
     }
 
-    boost::shared_ptr<std::map<int, int> > dbRootPMMap = oamcache->getDBRootToPMMap();
-    pmNum = (*dbRootPMMap)[dbRoot];
+    pmNum = oamcache->getOwnerPM(dbRoot);
 
     try
     {
@@ -463,7 +462,7 @@ DropTableProcessor::DDLResult DropTableProcessor::processPackageInternal(ddlpack
       return result;
     }
 
-    pmNum = (*dbRootPMMap)[dbRoot];
+    pmNum = oamcache->getOwnerPM(dbRoot);
 
     try
     {
@@ -1274,8 +1273,7 @@ TruncTableProcessor::DDLResult TruncTableProcessor::processPackageInternal(ddlpa
       bytestream << (uint32_t)colType.compressionType;
     }
 
-    boost::shared_ptr<std::map<int, int> > dbRootPMMap = oamcache->getDBRootToPMMap();
-    pmNum = (*dbRootPMMap)[useDBRoot];
+    pmNum = oamcache->getOwnerPM(useDBRoot);
 
     try
     {
diff --git a/dbcon/dmlpackageproc/commandpackageprocessor.cpp b/dbcon/dmlpackageproc/commandpackageprocessor.cpp
index 0554e9ec4..e57a80a54 100644
--- a/dbcon/dmlpackageproc/commandpackageprocessor.cpp
+++ b/dbcon/dmlpackageproc/commandpackageprocessor.cpp
@@ -845,20 +845,15 @@ void CommandPackageProcessor::clearTableLock(uint64_t uniqueId, const dmlpackage
     establishTableLockToClear(tableLockID, lockInfo);
     lockGrabbed = true;
 
-    oam::OamCache* oamCache = oam::OamCache::makeOamCache();
-    //oam::OamCache::dbRootPMMap_t dbRootPmMap = oamCache->getDBRootToPMMap();
-    //std::map<int, int>::const_iterator mapIter;
     std::set<int> pmSet;
 
     // Construct relevant list of PMs based on the DBRoots associated
     // with the tableLock.
     for (unsigned int k = 0; k < lockInfo.dbrootList.size(); k++)
     {
-      mapIter = dbRootPmMap->find(lockInfo.dbrootList[k]);
-
-      if (!oamCache->isOffline(lockInfo.dbrootList[k]))
+      if (!oamcache()->isOffline(lockInfo.dbrootList[k]))
       {
-        int pm = oamCache->getOwnerPM(lockInfo.dbrootList[k]);
+        int pm = oamcache()->getOwnerPM(lockInfo.dbrootList[k]);
         pmSet.insert(pm);
       }
       else
diff --git a/dbcon/dmlpackageproc/deletepackageprocessor.cpp b/dbcon/dmlpackageproc/deletepackageprocessor.cpp
index 2653fd68d..033f709c2 100644
--- a/dbcon/dmlpackageproc/deletepackageprocessor.cpp
+++ b/dbcon/dmlpackageproc/deletepackageprocessor.cpp
@@ -643,7 +643,7 @@ bool DeletePackageProcessor::processRowgroup(ByteStream& aRowGroup, DMLResult& r
 {
   bool rc = false;
   // cout << "Get dbroot " << dbroot << endl;
-  int pmNum = (*fDbRootPMMap)[dbroot];
+  int pmNum = oamcache()->getOwnerPM(dbroot);
   DMLTable* tablePtr = cpackage.get_Table();
   ByteStream bytestream;
   bytestream << (ByteStream::byte)WE_SVR_DELETE;
diff --git a/dbcon/dmlpackageproc/dmlpackageprocessor.h b/dbcon/dmlpackageproc/dmlpackageprocessor.h
index 06d6b35d5..4379e9412 100644
--- a/dbcon/dmlpackageproc/dmlpackageprocessor.h
+++ b/dbcon/dmlpackageproc/dmlpackageprocessor.h
@@ -165,8 +165,6 @@ class DMLPackageProcessor
       std::cout << "Cannot make connection to WES" << std::endl;
     }
 
-    oam::OamCache* oamCache = oam::OamCache::makeOamCache();
-    fDbRootPMMap = oamCache->getDBRootToPMMap();
     fDbrm = aDbrm;
     fSessionID = sid;
     fExeMgr = new execplan::ClientRotator(fSessionID, "ExeMgr");
@@ -489,6 +487,8 @@ class DMLPackageProcessor
                      uint32_t tableOid);
   int endTransaction(uint64_t uniqueId, BRM::TxnID txnID, bool success);
 
+  oam::OamCache* oamcache() { return oam::OamCache::makeOamCache(); }
+
   /** @brief the Session Manager interface
    */
   execplan::SessionManager fSessionManager;
@@ -500,8 +500,6 @@ class DMLPackageProcessor
   uint32_t fPMCount;
   WriteEngine::WEClients* fWEClient;
   BRM::DBRM* fDbrm;
-  boost::shared_ptr<std::map<int, std::set<int>> > fDbRootPMMap;
-  oam::Oam fOam;
   bool fRollbackPending;  // When set, any derived object should stop what it's doing and cleanup in
                           // preparation for a Rollback
   execplan::ClientRotator* fExeMgr;
diff --git a/dbcon/dmlpackageproc/insertpackageprocessor.cpp b/dbcon/dmlpackageproc/insertpackageprocessor.cpp
index 524acb677..9629a504c 100644
--- a/dbcon/dmlpackageproc/insertpackageprocessor.cpp
+++ b/dbcon/dmlpackageproc/insertpackageprocessor.cpp
@@ -275,8 +275,7 @@ DMLPackageProcessor::DMLResult InsertPackageProcessor::processPackageInternal(
       if (tmpSet)
       {
         dbroot = tmp.dbRoot;
-        boost::shared_ptr<std::map<int, int> > dbRootPMMap = oamcache->getDBRootToPMMap();
-        pmNum = (*dbRootPMMap)[dbroot];
+        pmNum = oamcache->getOwnerPM(dbroot);
 
         //@Bug 4760. validate pm value
         if (pmNum == 0)
diff --git a/dbcon/dmlpackageproc/updatepackageprocessor.cpp b/dbcon/dmlpackageproc/updatepackageprocessor.cpp
index 651779a58..91508ca46 100644
--- a/dbcon/dmlpackageproc/updatepackageprocessor.cpp
+++ b/dbcon/dmlpackageproc/updatepackageprocessor.cpp
@@ -161,8 +161,7 @@ DMLPackageProcessor::DMLResult UpdatePackageProcessor::processPackageInternal(
         int32_t sessionId = fSessionID;
         std::string processName("DMLProc");
         int i = 0;
-        OamCache* oamcache = OamCache::makeOamCache();
-        std::vector<int> pmList = oamcache->getModuleIds();
+        std::vector<int> pmList = oamcache()->getModuleIds();
         std::vector<uint32_t> pms;
 
         for (unsigned i = 0; i < pmList.size(); i++)
@@ -437,8 +436,7 @@ uint64_t UpdatePackageProcessor::fixUpRows(dmlpackage::CalpontDMLPackage& cpacka
   uint64_t rowsProcessed = 0;
   uint32_t dbroot = 1;
   bool metaData = false;
-  oam::OamCache* oamCache = oam::OamCache::makeOamCache();
-  std::vector<int> fPMs = oamCache->getModuleIds();
+  std::vector<int> fPMs = oamcache()->getModuleIds();
   std::map<unsigned, bool> pmState;
   string emsg;
   string emsgStr;
@@ -726,7 +724,7 @@ bool UpdatePackageProcessor::processRowgroup(ByteStream& aRowGroup, DMLResult& r
 {
   bool rc = false;
   // cout << "Get dbroot " << dbroot << endl;
-  uint32_t pmNum = (*fDbRootPMMap)[dbroot];
+  uint32_t pmNum = oamcache()->getOwnerPM(dbroot);
 
   ByteStream bytestream;
   bytestream << (uint8_t)WE_SVR_UPDATE;
diff --git a/oam/oamcpp/oamcache.cpp b/oam/oamcpp/oamcache.cpp
index 78e0a83b0..11c7489de 100644
--- a/oam/oamcpp/oamcache.cpp
+++ b/oam/oamcpp/oamcache.cpp
@@ -39,7 +39,7 @@ using namespace boost;
 namespace oam
 {
 
-
+#if 0
 struct CacheReloaded
 {
   CacheReloaded()
@@ -246,5 +246,6 @@ bool OamCache::isOffline(int dbRoot)
 {
   return dbRootConnectionMap->find(scannedExtents[i].dbRoot) == dbRootConnectionMap->end();
 }
+#endif
 
 } /* namespace oam */
diff --git a/oam/oamcpp/oamcache.h b/oam/oamcpp/oamcache.h
index 43ba9daeb..f019aab5b 100644
--- a/oam/oamcpp/oamcache.h
+++ b/oam/oamcpp/oamcache.h
@@ -51,6 +51,7 @@ class OamCache
   int getClosestConnection(int dbroot); // connection index to owner's PM or ours PM - who can access dbRoot.
   int getOwnerConnection(int dbroot); // connection index to owner's PM.
   int getOwnerPM(int dbroot); // Owner's PM index.
+  std::vector<int> getPMDBRoots(int PM); // what DBRoots are owned by given PM.
   bool isAccessibleBy(int dbRoot, int pmId);
     //// a necessary DB root is offline
     //if (dbRootConnectionMap->find(scannedExtents[i].dbRoot) == dbRootConnectionMap->end())
diff --git a/utils/batchloader/batchloader.cpp b/utils/batchloader/batchloader.cpp
index 0e9bfe836..0e1bb6a59 100644
--- a/utils/batchloader/batchloader.cpp
+++ b/utils/batchloader/batchloader.cpp
@@ -48,32 +48,7 @@ BatchLoader::BatchLoader(uint32_t tableOid, execplan::CalpontSystemCatalog::SCN
   fPMs = PMs;
   fSessionId = sessionId;
   fTableOid = tableOid;
-  OamCache* oamcache = OamCache::makeOamCache();
-  oam::OamCache::PMDbrootsMap_t systemPmDbrootMap = oamcache->getPMToDbrootsMap();
-  std::map<int, OamCache::dbRoots>::iterator iter = systemPmDbrootMap->begin();
-  // cout << "fPMs size is " << fPMs.size() << endl;
-  fPmDbrootMap.reset(new OamCache::PMDbrootsMap_t::element_type());
-  fDbrootPMmap.reset(new map<int, int>());
-
-  for (uint32_t i = 0; i < fPMs.size(); i++)
-  {
-    iter = systemPmDbrootMap->find(fPMs[i]);
-
-    if (iter != systemPmDbrootMap->end())
-    {
-      fDbRoots.insert(fDbRoots.end(), (iter->second).begin(), (iter->second).end());
-      (*fPmDbrootMap)[fPMs[i]] = iter->second;
-    }
-  }
-
-  // Build dbroot to PM map
-  for (iter = fPmDbrootMap->begin(); iter != fPmDbrootMap->end(); iter++)
-  {
-    for (uint32_t i = 0; i < iter->second.size(); i++)
-    {
-      (*fDbrootPMmap)[iter->second[i]] = iter->first;
-    }
-  }
+  fOamCache = OamCache::makeOamCache();
 }
 //------------------------------------------------------------------------------
 // Select the first PM to send the first batch of rows.
@@ -199,12 +174,7 @@ void BatchLoader::selectFirstPM(uint32_t& PMId)
 
   if (createdDbroot != 0)
   {
-    std::map<int, int>::iterator iter = fDbrootPMmap->begin();
-
-    iter = fDbrootPMmap->find(createdDbroot);
-
-    if (iter != fDbrootPMmap->end())
-      PMId = iter->second;
+    PMId = fOamCache->getOwnerPM(createdDbroot);
   }
 
   // This will build the batch distribution sequence
@@ -233,12 +203,12 @@ void BatchLoader::selectFirstPM(uint32_t& PMId)
     {
       PMRootInfo aEntry;
       aEntry.PMId = fPmDistSeq[j];
-      iter = fPmDbrootMap->find(aEntry.PMId);
+      auto dbroots = fOamCache->getPMDBRoots(PMId);
 
-      for (unsigned k = 0; k < (iter->second).size(); k++)
+      for (unsigned k = 0; k < dbroots.size(); k++)
       {
         RootExtentsBlocks aRootInfo;
-        aRootInfo.DBRoot = (iter->second)[k];
+        aRootInfo.DBRoot = dbroots[k];
         aRootInfo.numExtents = rootExtents[aRootInfo.DBRoot];
         aRootInfo.numBlocks = rootBlocks[aRootInfo.DBRoot];
         // cout << "aRootInfo DBRoot:numExtents:numBlocks = " <<
@@ -410,17 +380,15 @@ void BatchLoader::buildBatchDistSeqVector()
   fPmDistSeq.clear();
   BlIntVec aDbCntVec(fPMs.size());
 
-  std::map<int, OamCache::dbRoots>::iterator iter = fPmDbrootMap->begin();
-
   for (uint32_t i = 0; i < fPMs.size(); i++)
   {
-    iter = fPmDbrootMap->find(fPMs[i]);
+    auto dbroots = fOamCache->getPMDBRoots(fPMs[i]);
 
-    if ((iter != fPmDbrootMap->end()) && ((iter->second).begin() != (iter->second).end()))
+    if (dbroots.size() > 0)
     {
       try
       {
-        aDbCntVec[i] = (iter->second).size();
+        aDbCntVec[i] = dbroots.size();
         // cout << "PM - "<<fPMs[i] << " Size = " << aDbCntVec[i] << endl;
       }
       catch (std::exception& exp)
@@ -507,15 +475,13 @@ void BatchLoader::buildBatchDistSeqVector(uint32_t StartPm)
     }
   }
 
-  std::map<int, OamCache::dbRoots>::iterator iter = fPmDbrootMap->begin();
-
   for (uint32_t i = 0; i < aPms.size(); i++)
   {
-    iter = fPmDbrootMap->find(aPms[i]);
+    auto dbroots = fOamCache->getPMDBRoots(aPms[i]);
 
-    if ((iter != fPmDbrootMap->end()) && ((iter->second).begin() != (iter->second).end()))
+    if (dbroots.size())
     {
-      aDbCntVec[i] = (iter->second).size();
+      aDbCntVec[i] = dbroots.size();
       // cout << "PM - "<<aPms[i] << " Size = " << aDbCntVec[i] << endl;
     }
     else
diff --git a/utils/batchloader/batchloader.h b/utils/batchloader/batchloader.h
index f3625d036..890882397 100644
--- a/utils/batchloader/batchloader.h
+++ b/utils/batchloader/batchloader.h
@@ -119,8 +119,7 @@ class BatchLoader
   uint32_t fFirstPm;
   execplan::CalpontSystemCatalog::SCN fSessionId;
   uint32_t fTableOid;
-  oam::OamCache::PMDbrootsMap_t fPmDbrootMap;
-  oam::OamCache::dbRootPMMap_t fDbrootPMmap;
+  oam::OamCache* fOamCache;
 };
 
 }  // namespace batchloader
diff --git a/writeengine/client/we_ddlcommandclient.cpp b/writeengine/client/we_ddlcommandclient.cpp
index e17a0604d..7993ac023 100644
--- a/writeengine/client/we_ddlcommandclient.cpp
+++ b/writeengine/client/we_ddlcommandclient.cpp
@@ -37,6 +37,7 @@ namespace WriteEngine
 WE_DDLCommandClient::WE_DDLCommandClient()
 {
   fWEClient = new WEClients(WEClients::DDLPROC);
+  fOamCache = oam::OamCache->makeOamCache();
 }
 
 WE_DDLCommandClient::~WE_DDLCommandClient()
@@ -64,7 +65,7 @@ uint8_t WE_DDLCommandClient::UpdateSyscolumnNextval(uint32_t columnOid, uint64_t
 
   try
   {
-    fOam.getDbrootPmConfig(dbRoot, pmNum);
+    pmNum = fOamCache->getOwnerPM(dbRoot);
     fWEClient->write(command, pmNum);
 
     while (1)
diff --git a/writeengine/client/we_ddlcommandclient.h b/writeengine/client/we_ddlcommandclient.h
index b4ef7ce4d..98ee0204a 100644
--- a/writeengine/client/we_ddlcommandclient.h
+++ b/writeengine/client/we_ddlcommandclient.h
@@ -26,6 +26,7 @@
 #include "dbrm.h"
 #include "liboamcpp.h"
 #include "writeengine.h"
+#include "oamcache.h"
 
 #define EXPORT
 
@@ -50,7 +51,7 @@ class WE_DDLCommandClient
  private:
   BRM::DBRM fDbrm;
   WEClients* fWEClient;
-  oam::Oam fOam;
+  oam::OamCache* fOamCache;
 };
 
 }  // namespace WriteEngine
diff --git a/writeengine/redistribute/we_redistributecontrolthread.cpp b/writeengine/redistribute/we_redistributecontrolthread.cpp
index 7caa14b05..c62a53ae7 100644
--- a/writeengine/redistribute/we_redistributecontrolthread.cpp
+++ b/writeengine/redistribute/we_redistributecontrolthread.cpp
@@ -758,8 +758,7 @@ int RedistributeControlThread::executeRedistributePlan()
 int RedistributeControlThread::connectToWes(int dbroot)
 {
   int ret = 0;
-  OamCache::dbRootPMMap_t dbrootToPM = fOamCache->getDBRootToPMMap();
-  int pmId = (*dbrootToPM)[dbroot];
+  int pmId = fOamCache->getOwnerPM(dbroot);
   ostringstream oss;
   oss << "pm" << pmId << "_WriteEngineServer";
 
diff --git a/writeengine/redistribute/we_redistributeworkerthread.cpp b/writeengine/redistribute/we_redistributeworkerthread.cpp
index 1cd33c8a7..71fbb8425 100644
--- a/writeengine/redistribute/we_redistributeworkerthread.cpp
+++ b/writeengine/redistribute/we_redistributeworkerthread.cpp
@@ -134,11 +134,10 @@ void RedistributeWorkerThread::handleRequest()
       {
         memcpy(&fPlanEntry, fBs.buf(), sizeof(RedistributePlanEntry));
         fBs.advance(sizeof(RedistributePlanEntry));
-        OamCache::dbRootPMMap_t dbrootToPM = fOamCache->getDBRootToPMMap();
         fMyId.first = fPlanEntry.source;
-        fMyId.second = (*dbrootToPM)[fMyId.first];
+        fMyId.second = fOamCache->getOwnerPM(fMyId.first);
         fPeerId.first = fPlanEntry.destination;
-        fPeerId.second = (*dbrootToPM)[fPeerId.first];
+        fPeerId.second = fOamCache->getOwnerPM(fPeerId.first);
 
         if (grabTableLock() == 0)
         {