Query result pagination performance

Hi
I have CQ5.4 code (extract below) which uses QueryBuilder to create a query. The result set is quite large (~2000 nodes) and ordered. I set the hits per page and the start page as I display the results using a pager.
Performance is good for the first page of results, but performance degrades quite significantly as the page start value is increased towards the end of the result set. I find this strange as all nodes must always be accessed as the result set is sorted.
Does anyone have suggestions as to how I might resolve this performance issue?
Thanks
Simon
     QueryBuilder queryBuilder = resource.getResourceResolver().adaptTo(QueryBuilder.class);
     Session session = resource.getResourceResolver().adaptTo(Session.class);
     Query query = queryBuilder.createQuery(PredicateGroup.create(map), session);
     if (query != null) {
         int hitLimit = (pageMaximum>0) ? pageMaximum : limit;
         if (limit>0 && hitLimit>limit)
             hitLimit = limit;
         query.setHitsPerPage(hitLimit);
         query.setStart(pageStart);
         SearchResult result = query.getResult();
         totalMatches = result.getTotalMatches();
         actLimit = (limit>0) ? Math.min(limit, (int)totalMatches) : (int)totalMatches;

Sure, I can provide lots more information. I've tried many different styles of query, but found the behaviour to always be the same. The log extracts below show an example query and how increasing the offset using query.setStart() impacts the time taken by query.getResult().
I modified the code a little for some extra debug so it's clear where the time is being spent, snippet below.
I guess my questions really is, has anyone else used query.setStart() to set the offset for paging, did they see similar increases in response times and did they find a resolution ?
Does anyone else agree that it's strange that all the hard work of searching and sorting is fast, and, as expected, takes the same time irrespective of the offset, but returning the results takes longer when the offset is increased ?
Regards
Simon
     Query query = queryBuilder.createQuery(PredicateGroup.create(map), session);
     if (query != null) {
        int hitLimit = (pageMaximum>0) ? pageMaximum : limit;
        if (limit>0 && hitLimit>limit)
           hitLimit = limit;
        query.setHitsPerPage(hitLimit);
        query.setStart(pageStart);
         log.debug("Time to prepare : " + ((new Date()).getTime()-start) + "ms");
         SearchResult result = query.getResult();
         log.debug("Prep and getResult : " + ((new Date()).getTime()-start) + "ms");
Example 1: Offset 0, query takes 328 ms, results returned in 328 ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=0.html HTTP/1.1] com.xxx.wcm.components.List Time to prepare : 0ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=0.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl executing query (URL):
group.0_property=jcr%3acontent%2fpathTags&group.0_property.0_value=testing&group.0_propert y.1_value=portal&group.0_property.2_value=de&group.0_property.and=true&group.p.or=true&ord erby=%40jcr%3acontent%2fcq%3alastModified&orderby.index=true&orderby.sort=desc&p.limit=25& p.offset=0
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=0.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl executing query (predicate tree):
ROOT=group: limit=25, offset=0[
    {group=group: or=true[
        {0_property=property: 1_value=portal, 2_value=de, property=jcr:content/pathTags, 0_value=testing, and=true}
    {orderby=orderby: index=true, sort=desc, orderby=@jcr:content/cq:lastModified}
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=0.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl xpath query: //*[((jcr:content/@pathTags = 'portal' and jcr:content/@pathTags = 'de' and jcr:content/@pathTags = 'testing'))] order by jcr:content/@cq:lastModified descending
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=0.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl xpath query took 328 ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=0.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl >> xpath query returned 2643 results
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=0.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl entire query execution took 328 ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=0.html HTTP/1.1] com.xxx.wcm.components.List Prep and getResult : 328ms
Example 2: Offset 50, query takes 312ms, results returned in 890ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=50.html HTTP/1.1] com.xxx.wcm.components.List Time to prepare : 0ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=50.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl executing query (URL):
group.0_property=jcr%3acontent%2fpathTags&group.0_property.0_value=testing&group.0_propert y.1_value=portal&group.0_property.2_value=de&group.0_property.and=true&group.p.or=true&ord erby=%40jcr%3acontent%2fcq%3alastModified&orderby.index=true&orderby.sort=desc&p.limit=25& p.offset=50
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=50.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl executing query (predicate tree):
ROOT=group: limit=25, offset=50[
    {group=group: or=true[
        {0_property=property: 1_value=portal, 2_value=de, property=jcr:content/pathTags, 0_value=testing, and=true}
    {orderby=orderby: index=true, sort=desc, orderby=@jcr:content/cq:lastModified}
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=50.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl xpath query: //*[((jcr:content/@pathTags = 'portal' and jcr:content/@pathTags = 'de' and jcr:content/@pathTags = 'testing'))] order by jcr:content/@cq:lastModified descending
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=50.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl xpath query took 312 ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=50.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl >> xpath query returned 2643 results
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=50.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl entire query execution took 312 ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=50.html HTTP/1.1] com.xxx.wcm.components.List Prep and getResult : 890ms
Example 3: Offset 2625, query takes 359ms, results returned in 10250ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=2625.html HTTP/1.1] com.xxx.wcm.components.List Time to prepare : 0ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=2625.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl executing query (URL):
group.0_property=jcr%3acontent%2fpathTags&group.0_property.0_value=testing&group.0_propert y.1_value=portal&group.0_property.2_value=de&group.0_property.and=true&group.p.or=true&ord erby=%40jcr%3acontent%2fcq%3alastModified&orderby.index=true&orderby.sort=desc&p.limit=25& p.offset=2625
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=2625.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl executing query (predicate tree):
ROOT=group: limit=25, offset=2625[
    {group=group: or=true[
        {0_property=property: 1_value=portal, 2_value=de, property=jcr:content/pathTags, 0_value=testing, and=true}
    {orderby=orderby: index=true, sort=desc, orderby=@jcr:content/cq:lastModified}
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=2625.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl xpath query: //*[((jcr:content/@pathTags = 'portal' and jcr:content/@pathTags = 'de' and jcr:content/@pathTags = 'testing'))] order by jcr:content/@cq:lastModified descending
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=2625.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl xpath query took 359 ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=2625.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl >> xpath query returned 2643 results
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=2625.html HTTP/1.1] com.day.cq.search.impl.builder.QueryImpl entire query execution took 359 ms
GET /cm/content/testing/portal/de/simon/article2.contentparsys_list_start=2625.html HTTP/1.1] com.xxx.wcm.components.List Prep and getResult : 10250ms

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-----Original Message-----
From: Patrice Thiebaud
To: Choksi, Neelan
Sent: 8/13/01 1:18 PM
Subject: RE: Load of query results
Choksi,
Thank you for the information.
I have the additional three following questions :
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early September. We have not determined a release date for the
Enterprise
Edition (likely towards the end of the year).
Thanks,
Neelan Choksi
Kodo JDO Product Team
-----Original Message-----
From: White, Abe [ mailto:[email protected]
<mailto:[email protected]> ]
Sent: Friday, August 10, 2001 10:30 AM
To: JDO-ListServ
Subject: RE: Load of query results
Could you please clarify exactly what you mean by an 'automatic load' of
query results? And in what way is the 'resource manager' (db?) accessed
for each query object returned?
When Kodo issues a query it selects all fields of the expected result
class that lie in the primary table used by that type (with the
exception of LOB fields). Thus the objects returned by the query
already have all of their data filled in that is accessible with a
single SELECT. Additional queries are made only if you access fields of
an object that do not lie in its primary table, such as Collections,
arrays, Maps, and relations to other persistent objects.
Is that what you meant?
Whatever you mean, our goal is to implement the entire JDO
specification, including as much optional behavior as is useful to our
customers.
I'll have someone from marketing get back to you with the GA schedule.
-----Original Message-----
From: Patrice Thiebaud
To: [email protected]
Sent: 8/10/01 5:08 AM
Subject: Load of query results
Hi,
The final JDO specification is likely to support the need for having an
automatic load of query results, probably through a property (thus
answering a performance optimization need, as it is better to avoid
futher
access to the resource manager for each object used).
Will the GA version provide this feature ?
By the way, is it possible to know the scheduled date for GA ?
Thanks in advance.
BEA Systems : How Business Becomes E-Business
Patrice Thiebaud - Presales Senior Consultant
BEA Systems - France
Tour Manhattan
6 place de l'Iris
92095 PARIS La D__fense C__dex
Tel: 33 1 41 45 70 27 Mobile: 06 08 05 95 95
BEA Systems : How Business Becomes E-Business
Patrice Thiebaud - Presales Senior Consultant
BEA Systems - France
Tour Manhattan
6 place de l'Iris
92095 PARIS La D__fense C__dex
Tel: 33 1 41 45 70 27 Mobile: 06 08 05 95 95

I have tested Oracle only. Teradata has a "sample" command and I would hope that Web Intelligence would use that. The Oracle method involves the dbms_random package to assign each row a random number, then the query is sorted by that number and a limit is placed for the sample size.
I have not written about this on my blog yet, but it could be an interesting topic. Thanks for the suggestion.

Load of query results

Hi,
The final JDO specification is likely to support the need for having an
automatic load of query results, probably through a property (thus
answering a performance optimization need, as it is better to avoid futher
access to the resource manager for each object used).
Will the GA version provide this feature ?
By the way, is it possible to know the scheduled date for GA ?
Thanks in advance.
BEA Systems : How Business Becomes E-Business
Patrice Thiebaud - Presales Senior Consultant
BEA Systems - France
Tour Manhattan
6 place de l'Iris
92095 PARIS La D__fense C__dex
Tel: 33 1 41 45 70 27 Mobile: 06 08 05 95 95

Hi,
According to your description, my understanding is that when you use Angularjs to delete item then it throws the 412 error.
for the IF-MATCH in the delete method, it needs to contain in the headers like below:
'delete': { method: 'DELETE', headers: { 'Accept': 'application/json;odata=verbose', 'content-type': 'application/json;odata=verbose', 'X-RequestDigest': $("#__REQUESTDIGEST").val(), 'IF-MATCH': '*' } }
Here is a similiar thread for your reference:
SharePoint/Angular can't delete item - Error 412
Thanks
Best Regards
TechNet Community Support
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