2

In the developer console query editor, if I enter the query

select lastmodifiedDate from foo__c order by lastmodifiedDate desc limit 1

it runs fine. But the moment I try do that same query inside of a controller, I get an Internal Server Error. Debug logs show

14:44:11.956 (103956172471)|SOQL_EXECUTE_BEGIN|[31]|Aggregations:0|select lastmodifiedDate from foo__c order by lastmodifiedDate desc limit 1
14:46:15.080 (227080647980)|FATAL_ERROR|Internal Salesforce.com Error
14:46:15.080 (227080675619)|CUMULATIVE_LIMIT_USAGE
14:46:15.080 (227080675619)|LIMIT_USAGE_FOR_NS|(default)|
  Number of SOQL queries: 4 out of 100
  Number of query rows: 57 out of 50000
  Number of SOSL queries: 0 out of 20
  Number of DML statements: 0 out of 150
  Number of DML rows: 0 out of 10000
  Maximum CPU time: 100 out of 10000
  Maximum heap size: 0 out of 6000000
  Number of callouts: 0 out of 100
  Number of Email Invocations: 0 out of 10
  Number of future calls: 0 out of 50
  Number of queueable jobs added to the queue: 0 out of 50
  Number of Mobile Apex push calls: 0 out of 10

As you can see from the log above, it says the soql query takes over 2 minutes before returning the error. Why is my query failing inside a controller?

  • what i am guessing because of your heep size exceed – Ratan Paul Nov 27 '15 at 4:01
  • do soql queries have a hidden heap size limit? – user2610036 Nov 27 '15 at 4:04
  • looks like it is not a code level error. Try after sometimes may be this will resolved. – Ratan Paul Nov 27 '15 at 4:07
  • is your query dynamic means you are using database.query() or Database.getQueryLocator() ? – Ratan Paul Nov 27 '15 at 4:10
  • I'm doing it in a database.query() – user2610036 Nov 27 '15 at 4:14
3

I think its performance issue. The query is running super slow. There are multiple options to optimize this query.

1) use SystemModStamp : https://developer.salesforce.com/blogs/engineering/2014/11/force-com-soql-performance-tips-systemmodstamp-vs-lastmodifieddate-2.html

2) Make query more selective by adding some criteria . i.e. where SystemModStamp > THIS_MOnths : https://developer.salesforce.com/blogs/engineering/2013/12/force-com-query-optimizer-secrets-you-can-use-today.html

3) Store the timestamp when you update your record.

  • In addition to these suggestions, I've found that using the ajax toolkit to do the query is more performant, even though it should have the same governor limits. – user2610036 Dec 1 '15 at 1:20

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