Fetch fragment entities using recursive SQL query

- Add SQL query that can fetch needed fragments to any given depth
- Update getFragmentEntities to use new query
- Remove now unused FragmentRepositoryMultiPathQuery
- Remove unused TempTableCreator method
- Result: getDataNodesForMultipleXpaths is up to 10 times faster

Issue-ID: CPS-1525
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I07cbc9da5ab994ce7e0c2b02d7ca05089f05dab0

12 files changed, 122 insertions, 168 deletions

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
index 3ea388242e..82e6388d8b 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/impl/CpsDataPersistenceServiceImpl.java
@@ -256,12 +256,14 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
                                                               final Collection<String> xpaths,
                                                               final FetchDescendantsOption fetchDescendantsOption) {
         final AnchorEntity anchorEntity = getAnchorEntity(dataspaceName, anchorName);
-        final Collection<FragmentEntity> fragmentEntities = getFragmentEntities(anchorEntity, xpaths);
+        final Collection<FragmentEntity> fragmentEntities =
+            getFragmentEntities(anchorEntity, xpaths, fetchDescendantsOption);
         return toDataNodes(fragmentEntities, fetchDescendantsOption);
     }
 
     private Collection<FragmentEntity> getFragmentEntities(final AnchorEntity anchorEntity,
-                                                           final Collection<String> xpaths) {
+                                                           final Collection<String> xpaths,
+                                                           final FetchDescendantsOption fetchDescendantsOption) {
         final Collection<String> nonRootXpaths = new HashSet<>(xpaths);
         final boolean haveRootXpath = nonRootXpaths.removeIf(CpsDataPersistenceServiceImpl::isRootXpath);
 
@@ -273,15 +275,15 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
                 log.warn("Error parsing xpath \"{}\": {}", xpath, e.getMessage());
             }
         }
-        final Collection<FragmentEntity> fragmentEntities =
-            new HashSet<>(fragmentRepository.findByAnchorAndMultipleCpsPaths(anchorEntity.getId(), normalizedXpaths));
-
         if (haveRootXpath) {
-            final List<FragmentExtract> fragmentExtracts = fragmentRepository.findAllExtractsByAnchor(anchorEntity);
-            fragmentEntities.addAll(FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts));
+            normalizedXpaths.addAll(fragmentRepository.findAllXpathByAnchorAndParentIdIsNull(anchorEntity));
         }
 
-        return fragmentEntities;
+        final List<FragmentExtract> fragmentExtracts =
+            fragmentRepository.findExtractsWithDescendants(anchorEntity.getId(), normalizedXpaths,
+                fetchDescendantsOption.getDepth());
+
+        return FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
     }
 
     private FragmentEntity getFragmentEntity(final AnchorEntity anchorEntity, final String xpath) {
@@ -325,7 +327,8 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
         }
         fragmentEntities = fragmentRepository.findByAnchorAndCpsPath(anchorEntity.getId(), cpsPathQuery);
         if (cpsPathQuery.hasAncestorAxis()) {
-            fragmentEntities = getAncestorFragmentEntities(anchorEntity.getId(), cpsPathQuery, fragmentEntities);
+            final Collection<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
+            fragmentEntities = getFragmentEntities(anchorEntity, ancestorXpaths, fetchDescendantsOption);
         }
         return createDataNodesFromProxiedFragmentEntities(fetchDescendantsOption, anchorEntity, fragmentEntities);
     }
@@ -346,19 +349,12 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
             fragmentRepository.quickFindWithDescendants(anchorEntity.getId(), xpathRegex);
         fragmentEntities = FragmentEntityArranger.toFragmentEntityTrees(anchorEntity, fragmentExtracts);
         if (cpsPathQuery.hasAncestorAxis()) {
-            fragmentEntities = getAncestorFragmentEntities(anchorEntity.getId(), cpsPathQuery, fragmentEntities);
+            final Collection<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
+            fragmentEntities = getFragmentEntities(anchorEntity, ancestorXpaths, fetchDescendantsOption);
         }
         return createDataNodesFromFragmentEntities(fetchDescendantsOption, fragmentEntities);
     }
 
-    private Collection<FragmentEntity> getAncestorFragmentEntities(final int anchorId,
-                                                                   final CpsPathQuery cpsPathQuery,
-                                                                   final Collection<FragmentEntity> fragmentEntities) {
-        final Collection<String> ancestorXpaths = processAncestorXpath(fragmentEntities, cpsPathQuery);
-        return ancestorXpaths.isEmpty() ? Collections.emptyList()
-            : fragmentRepository.findByAnchorAndMultipleCpsPaths(anchorId, ancestorXpaths);
-    }
-
     private List<DataNode> createDataNodesFromProxiedFragmentEntities(
                                             final FetchDescendantsOption fetchDescendantsOption,
                                             final AnchorEntity anchorEntity,
@@ -497,7 +493,8 @@ public class CpsDataPersistenceServiceImpl implements CpsDataPersistenceService
             .collect(Collectors.toMap(DataNode::getXpath, dataNode -> dataNode));
 
         final Collection<String> xpaths = xpathToUpdatedDataNode.keySet();
-        final Collection<FragmentEntity> existingFragmentEntities = getFragmentEntities(anchorEntity, xpaths);
+        final Collection<FragmentEntity> existingFragmentEntities =
+            getFragmentEntities(anchorEntity, xpaths, FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS);
 
         for (final FragmentEntity existingFragmentEntity : existingFragmentEntities) {
             final DataNode updatedDataNode = xpathToUpdatedDataNode.get(existingFragmentEntity.getXpath());
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
index 996e55e777..426a4601c7 100755
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepository.java
@@ -37,7 +37,7 @@ import org.springframework.stereotype.Repository;
 

 @Repository

 public interface FragmentRepository extends JpaRepository<FragmentEntity, Long>, FragmentRepositoryCpsPathQuery,

-        FragmentRepositoryMultiPathQuery, FragmentNativeRepository {

+        FragmentNativeRepository {

 

     Optional<FragmentEntity> findByAnchorAndXpath(AnchorEntity anchorEntity, String xpath);

 

@@ -68,9 +68,30 @@ public interface FragmentRepository extends JpaRepository<FragmentEntity, Long>,
     List<FragmentExtract> quickFindWithDescendants(@Param("anchorId") int anchorId,

                                                    @Param("xpathRegex") String xpathRegex);

 

-    @Query("SELECT xpath FROM FragmentEntity f WHERE anchor = :anchor AND xpath IN :xpaths")

+    @Query("SELECT xpath FROM FragmentEntity WHERE anchor = :anchor AND xpath IN :xpaths")

     List<String> findAllXpathByAnchorAndXpathIn(@Param("anchor") AnchorEntity anchorEntity,

                                                 @Param("xpaths") Collection<String> xpaths);

 

     boolean existsByAnchorAndXpathStartsWith(AnchorEntity anchorEntity, String xpath);

+

+    @Query("SELECT xpath FROM FragmentEntity WHERE anchor = :anchor AND parentId IS NULL")

+    List<String> findAllXpathByAnchorAndParentIdIsNull(@Param("anchor") AnchorEntity anchorEntity);

+

+    @Query(value

+        = "WITH RECURSIVE parent_search AS ("

+        + "  SELECT id, 0 AS depth "

+        + "    FROM fragment "

+        + "   WHERE anchor_id = :anchorId AND xpath IN :xpaths "

+        + "   UNION "

+        + "  SELECT c.id, depth + 1 "

+        + "    FROM fragment c INNER JOIN parent_search p ON c.parent_id = p.id"

+        + "   WHERE depth <= (SELECT CASE WHEN :maxDepth = -1 THEN " + Integer.MAX_VALUE + " ELSE :maxDepth END) "

+        + ") "

+        + "SELECT f.id, anchor_id AS anchorId, xpath, f.parent_id AS parentId, CAST(attributes AS TEXT) AS attributes "

+        + "FROM fragment f INNER JOIN parent_search p ON f.id = p.id",

+        nativeQuery = true

+    )

+    List<FragmentExtract> findExtractsWithDescendants(@Param("anchorId") int anchorId,

+                                                      @Param("xpaths") Collection<String> xpaths,

+                                                      @Param("maxDepth") int maxDepth);

 }

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQuery.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQuery.java
deleted file mode 100644
index 9c34a459e9..0000000000
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQuery.java
+++ /dev/null
@@ -1,31 +0,0 @@
-/*-
- * ============LICENSE_START=======================================================
- *  Copyright (C) 2022 Nordix Foundation.
- * ================================================================================
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * SPDX-License-Identifier: Apache-2.0
- * ============LICENSE_END=========================================================
- */
-
-package org.onap.cps.spi.repository;
-
-import java.util.Collection;
-import java.util.List;
-import org.onap.cps.spi.entities.FragmentEntity;
-
-public interface FragmentRepositoryMultiPathQuery {
-
-    List<FragmentEntity> findByAnchorAndMultipleCpsPaths(Integer anchorId, Collection<String> cpsPathQuery);
-
-}
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQueryImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQueryImpl.java
deleted file mode 100644
index 151fe97b34..0000000000
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryMultiPathQueryImpl.java
+++ /dev/null
@@ -1,59 +0,0 @@
-/*-
- * ============LICENSE_START=======================================================
- *  Copyright (C) 2022-2023 Nordix Foundation.
- * ================================================================================
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * SPDX-License-Identifier: Apache-2.0
- * ============LICENSE_END=========================================================
- */
-
-package org.onap.cps.spi.repository;
-
-import java.util.Collection;
-import java.util.Collections;
-import java.util.List;
-import javax.persistence.EntityManager;
-import javax.persistence.PersistenceContext;
-import javax.transaction.Transactional;
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import org.onap.cps.spi.entities.FragmentEntity;
-
-@Slf4j
-@RequiredArgsConstructor
-public class FragmentRepositoryMultiPathQueryImpl implements FragmentRepositoryMultiPathQuery {
-
-    @PersistenceContext
-    private final EntityManager entityManager;
-
-    private final TempTableCreator tempTableCreator;
-
-    @Override
-    @Transactional
-    public List<FragmentEntity> findByAnchorAndMultipleCpsPaths(final Integer anchorId,
-                                                                final Collection<String> cpsPathQueryList) {
-        if (cpsPathQueryList.isEmpty()) {
-            return Collections.emptyList();
-        }
-        final String tempTableName = tempTableCreator.createTemporaryTable(
-            "xpathTemporaryTable", cpsPathQueryList, "xpath");
-        final String sql = String.format(
-            "SELECT * FROM FRAGMENT WHERE anchor_id = %d AND xpath IN (select xpath FROM %s);",
-            anchorId, tempTableName);
-        final List<FragmentEntity> fragmentEntities = entityManager.createNativeQuery(sql, FragmentEntity.class)
-            .getResultList();
-        log.debug("Fetched {} fragment entities by anchor and cps path.", fragmentEntities.size());
-        return fragmentEntities;
-    }
-}
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/TempTableCreator.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/TempTableCreator.java
index d798932c02..139a8b3063 100644
--- a/cps-ri/src/main/java/org/onap/cps/spi/repository/TempTableCreator.java
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/TempTableCreator.java
@@ -20,10 +20,8 @@
 
 package org.onap.cps.spi.repository;
 
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
@@ -66,24 +64,6 @@ public class TempTableCreator {
         return tempTableName;
     }
 
-    /**
-     * Create a uniquely named temporary table with a single column.
-     *
-     * @param prefix     prefix for the table name (so you can recognize it)
-     * @param sqlData    data to insert (strings only); each entry is a single row of data
-     * @param columnName column name
-     * @return a unique temporary table name with given prefix
-     */
-    public String createTemporaryTable(final String prefix,
-                                       final Collection<String> sqlData,
-                                       final String columnName) {
-        final Collection<List<String>> tableData = new ArrayList<>(sqlData.size());
-        for (final String entry : sqlData) {
-            tableData.add(Collections.singletonList(entry));
-        }
-        return createTemporaryTable(prefix, tableData, columnName);
-    }
-
     private static void defineColumns(final StringBuilder sqlStringBuilder, final String[] columnNames) {
         sqlStringBuilder.append('(');
         final Iterator<String> it = Arrays.stream(columnNames).iterator();
diff --git a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceIntegrationSpec.groovy b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceIntegrationSpec.groovy
index 25f19f7a8d..e60afa78df 100755
--- a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceIntegrationSpec.groovy
+++ b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceIntegrationSpec.groovy
@@ -307,7 +307,7 @@ class CpsDataPersistenceServiceIntegrationSpec extends CpsPersistenceSpecBase {
             'root xpath'                           | ["/"]                                           || 7
             'empty (root) xpath'                   | [""]                                            || 7
             'root and top-level xpaths'            | ["/", "/parent-200", "/parent-201"]             || 7
-            'root and child xpaths'                | ["/", "/parent-200/child-201"]                  || 8
+            'root and child xpaths'                | ["/", "/parent-200/child-201"]                  || 7
     }
 
     @Sql([CLEAR_DATA, SET_DATA])
diff --git a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceSpec.groovy b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceSpec.groovy
index e74b4a7450..3d7003d2a7 100644
--- a/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceSpec.groovy
+++ b/cps-ri/src/test/groovy/org/onap/cps/spi/impl/CpsDataPersistenceServiceSpec.groovy
@@ -26,6 +26,7 @@ import org.onap.cps.spi.FetchDescendantsOption
 import org.onap.cps.spi.entities.AnchorEntity
 import org.onap.cps.spi.entities.DataspaceEntity
 import org.onap.cps.spi.entities.FragmentEntity
+import org.onap.cps.spi.entities.FragmentExtract
 import org.onap.cps.spi.exceptions.ConcurrencyException
 import org.onap.cps.spi.exceptions.DataValidationException
 import org.onap.cps.spi.model.DataNode
@@ -150,9 +151,10 @@ class CpsDataPersistenceServiceSpec extends Specification {
 
     def 'Retrieving multiple data nodes.'() {
         given: 'fragment repository returns a collection of fragments'
-            def fragmentEntity1 = new FragmentEntity(xpath: '/xpath1', childFragments: [])
-            def fragmentEntity2 = new FragmentEntity(xpath: '/xpath2', childFragments: [])
-            mockFragmentRepository.findByAnchorAndMultipleCpsPaths(123, ['/xpath1', '/xpath2'] as Set<String>) >> [fragmentEntity1, fragmentEntity2]
+            mockFragmentRepository.findExtractsWithDescendants(123, ['/xpath1', '/xpath2'] as Set, _) >> [
+                mockFragmentExtract(1, null, 123, '/xpath1', null),
+                mockFragmentExtract(2, null, 123, '/xpath2', null)
+            ]
         when: 'getting data nodes for 2 xpaths'
             def result = objectUnderTest.getDataNodesForMultipleXpaths('some-dataspace', 'some-anchor', ['/xpath1', '/xpath2'], FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS)
         then: '2 data nodes are returned'
@@ -203,8 +205,10 @@ class CpsDataPersistenceServiceSpec extends Specification {
 
     def 'update data node and descendants: #scenario'(){
         given: 'the fragment repository returns fragment entities related to the xpath inputs'
-            mockFragmentRepository.findByAnchorAndMultipleCpsPaths(_, [] as Set) >> []
-            mockFragmentRepository.findByAnchorAndMultipleCpsPaths(_, ['/test/xpath'] as Set) >> [new FragmentEntity(xpath: '/test/xpath', childFragments: [])]
+            mockFragmentRepository.findExtractsWithDescendants(_, [] as Set, _) >> []
+            mockFragmentRepository.findExtractsWithDescendants(_, ['/test/xpath'] as Set, _) >> [
+                mockFragmentExtract(1, null, 123, '/test/xpath', null)
+            ]
         when: 'replace data node tree'
             objectUnderTest.updateDataNodesAndDescendants('dataspaceName', 'anchorName', dataNodes)
         then: 'call fragment repository save all method'
@@ -217,9 +221,10 @@ class CpsDataPersistenceServiceSpec extends Specification {
 
     def 'update data nodes and descendants'() {
         given: 'the fragment repository returns fragment entities related to the xpath inputs'
-            mockFragmentRepository.findByAnchorAndMultipleCpsPaths(_, ['/test/xpath1', '/test/xpath2'] as Set) >> [
-                new FragmentEntity(xpath: '/test/xpath1', childFragments: [], anchor: anchorEntity),
-                new FragmentEntity(xpath: '/test/xpath2', childFragments: [], anchor: anchorEntity)]
+            mockFragmentRepository.findExtractsWithDescendants(123, ['/test/xpath1', '/test/xpath2'] as Set, _) >> [
+                mockFragmentExtract(1, null, 123, '/test/xpath1', null),
+                mockFragmentExtract(2, null, 123, '/test/xpath2', null)
+            ]
         and: 'some data nodes with descendants'
             def dataNode1 = new DataNode(xpath: '/test/xpath1', leaves: ['id': 'testId1'], childDataNodes: [new DataNode(xpath: '/test/xpath1/child', leaves: ['id': 'childTestId1'])])
             def dataNode2 = new DataNode(xpath: '/test/xpath2', leaves: ['id': 'testId2'], childDataNodes: [new DataNode(xpath: '/test/xpath2/child', leaves: ['id': 'childTestId2'])])
@@ -247,26 +252,39 @@ class CpsDataPersistenceServiceSpec extends Specification {
 
     def createDataNodesAndMockRepositoryMethodSupportingThem(Map<String, String> xpathToScenarioMap) {
         def dataNodes = []
-        def fragmentEntities = []
+        def fragmentExtracts = []
+        def fragmentId = 1
         xpathToScenarioMap.each {
             def xpath = it.key
             def scenario = it.value
             def dataNode = new DataNodeBuilder().withXpath(xpath).build()
             dataNodes.add(dataNode)
-            def fragmentEntity = new FragmentEntity(xpath: xpath, childFragments: [])
-            fragmentEntities.add(fragmentEntity)
-            mockFragmentRepository.getByAnchorAndXpath(_, xpath) >> fragmentEntity
+            def fragmentExtract = mockFragmentExtract(fragmentId, null, null, xpath, null)
+            fragmentExtracts.add(fragmentExtract)
+            def fragmentEntity = new FragmentEntity(id: fragmentId, xpath: xpath, childFragments: [])
+            mockFragmentRepository.getByDataspaceAndAnchorAndXpath(_, _, xpath) >> fragmentEntity
             if ('EXCEPTION' == scenario) {
                 mockFragmentRepository.save(fragmentEntity) >> { throw new StaleStateException("concurrent updates") }
             }
+            fragmentId++
         }
-        mockFragmentRepository.findByAnchorAndMultipleCpsPaths(_, xpathToScenarioMap.keySet()) >> fragmentEntities
+        mockFragmentRepository.findExtractsWithDescendants(_, xpathToScenarioMap.keySet(), _) >> fragmentExtracts
         return dataNodes
     }
 
     def mockFragmentWithJson(json) {
-        def fragmentEntity = new FragmentEntity(xpath: '/parent-01', childFragments: [], attributes: json)
-        mockFragmentRepository.findByAnchorAndMultipleCpsPaths(123, ['/parent-01'] as Set<String>) >> [fragmentEntity]
+        def fragmentExtract = mockFragmentExtract(456, null, null, '/parent-01', json)
+        mockFragmentRepository.findExtractsWithDescendants(123, ['/parent-01'] as Set, _) >> [fragmentExtract]
+    }
+
+    def mockFragmentExtract(id, parentId, anchorId, xpath, attributes) {
+        def fragmentExtract = Mock(FragmentExtract)
+        fragmentExtract.getId() >> id
+        fragmentExtract.getParentId() >> parentId
+        fragmentExtract.getAnchorId() >> anchorId
+        fragmentExtract.getXpath() >> xpath
+        fragmentExtract.getAttributes() >> attributes
+        return fragmentExtract
     }
 
 }
diff --git a/cps-ri/src/test/groovy/org/onap/cps/spi/performance/CpsDataPersistenceServicePerfTest.groovy b/cps-ri/src/test/groovy/org/onap/cps/spi/performance/CpsDataPersistenceServicePerfTest.groovy
index 7f4716a7fa..98ff211a60 100644
--- a/cps-ri/src/test/groovy/org/onap/cps/spi/performance/CpsDataPersistenceServicePerfTest.groovy
+++ b/cps-ri/src/test/groovy/org/onap/cps/spi/performance/CpsDataPersistenceServicePerfTest.groovy
@@ -72,8 +72,8 @@ class CpsDataPersistenceServicePerfTest extends CpsPersistencePerfSpecBase {
             assert countDataNodes(result[0]) == TOTAL_NUMBER_OF_NODES
         where: 'the following xPaths are used'
             scenario | xpath            || allowedDuration
-            'parent' | PERF_TEST_PARENT || 5000
-            'root'   | ''               || 500
+            'parent' | PERF_TEST_PARENT || 500
+            'root'   | '/'              || 500
     }
 
     def 'Query parent data node with many descendants by cps-path'() {
@@ -82,8 +82,8 @@ class CpsDataPersistenceServicePerfTest extends CpsPersistencePerfSpecBase {
             def result = objectUnderTest.queryDataNodes(PERF_DATASPACE, PERF_ANCHOR, '//perf-parent-1' , INCLUDE_ALL_DESCENDANTS)
             stopWatch.stop()
             def readDurationInMillis = stopWatch.getTotalTimeMillis()
-        then: 'read duration is under 500 milliseconds'
-            recordAndAssertPerformance('Query with many descendants', 500, readDurationInMillis)
+        then: 'read duration is under 350 milliseconds'
+            recordAndAssertPerformance('Query with many descendants', 350, readDurationInMillis)
         and: 'data node is returned with all the descendants populated'
             assert countDataNodes(result) == TOTAL_NUMBER_OF_NODES
     }
@@ -97,8 +97,8 @@ class CpsDataPersistenceServicePerfTest extends CpsPersistencePerfSpecBase {
             def readDurationInMillis = stopWatch.getTotalTimeMillis()
         then: 'the returned number of entities equal to the number of children * number of grandchildren'
             assert result.size() == xpathsToAllGrandChildren.size()
-        and: 'it took less then 5000ms'
-            recordAndAssertPerformance('Find multiple xpaths', 5000, readDurationInMillis)
+        and: 'it took less then 1000ms'
+            recordAndAssertPerformance('Find multiple xpaths', 1000, readDurationInMillis)
     }
 
     def 'Query many descendants by cps-path with #scenario'() {
@@ -131,8 +131,8 @@ class CpsDataPersistenceServicePerfTest extends CpsPersistencePerfSpecBase {
             objectUnderTest.updateDataNodesAndDescendants(PERF_DATASPACE, PERF_ANCHOR, dataNodes)
             stopWatch.stop()
             def updateDurationInMillis = stopWatch.getTotalTimeMillis()
-        then: 'update duration is under 900 milliseconds'
-            recordAndAssertPerformance('Update data nodes with descendants', 900, updateDurationInMillis)
+        then: 'update duration is under 500 milliseconds'
+            recordAndAssertPerformance('Update data nodes with descendants', 500, updateDurationInMillis)
     }
 
     def 'Update data nodes without descendants'() {
diff --git a/cps-service/src/main/java/org/onap/cps/spi/FetchDescendantsOption.java b/cps-service/src/main/java/org/onap/cps/spi/FetchDescendantsOption.java
index cf5e04dc46..02574995dc 100644
--- a/cps-service/src/main/java/org/onap/cps/spi/FetchDescendantsOption.java
+++ b/cps-service/src/main/java/org/onap/cps/spi/FetchDescendantsOption.java
@@ -76,6 +76,14 @@ public class FetchDescendantsOption {
     }
 
     /**
+     * Get depth.
+     * @return depth: -1 for all descendants, 0 for no descendants, or positive value for fixed level of descendants
+     */
+    public int getDepth() {
+        return depth;
+    }
+
+    /**
      * get fetch descendants option for given descendant.
      *
      * @param fetchDescendantsOptionAsString fetch descendants option string
diff --git a/integration-test/src/test/groovy/org/onap/cps/integration/performance/base/CpsPerfTestBase.groovy b/integration-test/src/test/groovy/org/onap/cps/integration/performance/base/CpsPerfTestBase.groovy
index 6fb6d844a9..e75f1dce36 100644
--- a/integration-test/src/test/groovy/org/onap/cps/integration/performance/base/CpsPerfTestBase.groovy
+++ b/integration-test/src/test/groovy/org/onap/cps/integration/performance/base/CpsPerfTestBase.groovy
@@ -20,6 +20,8 @@
 
 package org.onap.cps.integration.performance.base
 
+import org.onap.cps.spi.FetchDescendantsOption
+
 import java.time.OffsetDateTime
 import org.onap.cps.integration.base.CpsIntegrationSpecBase
 import org.onap.cps.rest.utils.MultipartFileUtil
@@ -44,11 +46,21 @@ class CpsPerfTestBase extends PerfTestBase {
     }
 
     def createInitialData() {
+        createWarmupData()
         createLargeBookstoresData()
         addOpenRoadModel()
         addOpenRoadData()
     }
 
+    def createWarmupData() {
+        def data = "{\"bookstore\":{}}"
+        stopWatch.start()
+        addAnchorsWithData(1, CpsIntegrationSpecBase.BOOKSTORE_SCHEMA_SET, 'warmup', data)
+        stopWatch.stop()
+        def durationInMillis = stopWatch.getTotalTimeMillis()
+        recordAndAssertPerformance('Creating warmup anchor with tiny data tree', 250, durationInMillis)
+    }
+
     def createLargeBookstoresData() {
         def data = CpsIntegrationSpecBase.readResourceDataFile('bookstore/largeModelData.json')
         stopWatch.start()
@@ -80,7 +92,17 @@ class CpsPerfTestBase extends PerfTestBase {
             cpsAdminService.createAnchor(CPS_PERFORMANCE_TEST_DATASPACE, schemaSetName, anchorNamePrefix + it)
             cpsDataService.saveData(CPS_PERFORMANCE_TEST_DATASPACE, anchorNamePrefix + it, data, OffsetDateTime.now())
         }
+    }
 
+    def 'Warm the database'() {
+        when: 'get data nodes for warmup anchor'
+            stopWatch.start()
+            def result = cpsDataService.getDataNodes(CPS_PERFORMANCE_TEST_DATASPACE, 'warmup1', '/', FetchDescendantsOption.OMIT_DESCENDANTS)
+            assert countDataNodesInTree(result) == 1
+            stopWatch.stop()
+            def durationInMillis = stopWatch.getTotalTimeMillis()
+        then: 'all data is read within 15 seconds (warm up not critical)'
+            recordAndAssertPerformance("Warming database", 15_000, durationInMillis)
     }
 
 }
diff --git a/integration-test/src/test/groovy/org/onap/cps/integration/performance/cps/GetPerfTest.groovy b/integration-test/src/test/groovy/org/onap/cps/integration/performance/cps/GetPerfTest.groovy
index 753faf44f1..30e8bf23d4 100644
--- a/integration-test/src/test/groovy/org/onap/cps/integration/performance/cps/GetPerfTest.groovy
+++ b/integration-test/src/test/groovy/org/onap/cps/integration/performance/cps/GetPerfTest.groovy
@@ -42,10 +42,10 @@ class GetPerfTest extends CpsPerfTestBase {
             recordAndAssertPerformance("Read datatrees using ${scenario}", durationLimit, durationInMillis)
         where: 'the following xpaths are used'
             scenario                | anchorPrefix | xpath                || durationLimit | expectedNumberOfDataNodes
-            'bookstore root'        | 'bookstore'  | '/'                  || 25_000        | 78
-            'bookstore top element' | 'bookstore'  | '/bookstore'         || 1_000         | 78
-            'openroadm root'        | 'openroadm'  | '/'                  || 1_000         | 2151
-            'openroadm top element' | 'openroadm'  | '/openroadm-devices' || 10_000        | 2151
+            'bookstore root'        | 'bookstore'  | '/'                  || 130           | 78
+            'bookstore top element' | 'bookstore'  | '/bookstore'         || 130           | 78
+            'openroadm root'        | 'openroadm'  | '/'                  || 750           | 2151
+            'openroadm top element' | 'openroadm'  | '/openroadm-devices' || 750           | 2151
     }
 
 }
diff --git a/integration-test/src/test/groovy/org/onap/cps/integration/performance/ncmp/CmHandleQueryPerfTest.groovy b/integration-test/src/test/groovy/org/onap/cps/integration/performance/ncmp/CmHandleQueryPerfTest.groovy
index 939281a73c..87327030c7 100644
--- a/integration-test/src/test/groovy/org/onap/cps/integration/performance/ncmp/CmHandleQueryPerfTest.groovy
+++ b/integration-test/src/test/groovy/org/onap/cps/integration/performance/ncmp/CmHandleQueryPerfTest.groovy
@@ -21,12 +21,11 @@
 package org.onap.cps.integration.performance.ncmp
 
 import java.util.stream.Collectors
-
+import org.onap.cps.integration.performance.base.NcmpRegistryPerfTestBase
+import org.springframework.dao.DataAccessResourceFailureException
 import static org.onap.cps.spi.FetchDescendantsOption.OMIT_DESCENDANTS
 import static org.onap.cps.spi.FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS
 
-import org.onap.cps.integration.performance.base.NcmpRegistryPerfTestBase
-
 class CmHandleQueryPerfTest extends NcmpRegistryPerfTestBase {
 
     def objectUnderTest
@@ -52,14 +51,13 @@ class CmHandleQueryPerfTest extends NcmpRegistryPerfTestBase {
             assert countDataNodesInTree(result) == 5 * 999
     }
 
-    def 'Multiple get limitation: 32,764 (~ 2^15) xpaths.'() {
+    def 'Multiple get limit exceeded: 32,764 (~ 2^15) xpaths.'() {
         given: 'more than 32,764 xpaths)'
-            def xpaths = []
-            (0..32_765).each { xpaths.add("/size/of/this/path/does/not/matter/for/limit[@id='" + it + "']") }
-        when: 'get single get is executed to get all the parent objects and their descendants'
+            def xpaths = (0..32_764).collect(i -> "/size/of/this/path/does/not/matter/for/limit[@id='" + i + "']")
+        when: 'single get is executed to get all the parent objects and their descendants'
             cpsDataService.getDataNodesForMultipleXpaths(NCMP_PERFORMANCE_TEST_DATASPACE, REGISTRY_ANCHOR, xpaths, INCLUDE_ALL_DESCENDANTS)
-        then: 'no exception is thrown (limit is not present in current implementation)'
-            noExceptionThrown()
+        then: 'an exception is thrown'
+            thrown(DataAccessResourceFailureException.class)
     }
 
 }