Process instances are stucked while querying data from a View in database.

RE: Process instances are stucked while querying data from a View in database.

kais — Fri, 06 Nov 2020 14:09:44 GMT

Hi,

What Stefan is referring to is this:

The amount of memory in bytes that will be consumed in the application server for a single query before the query is halted is configured using the following property:

conf.data.query.memory.limit=1048576

The default is 1048576 bytes (1 MB).

NOTE: Before changing this value, consider using the query paging parameter to return less data (or return data in batches) and therefore avoid the limit. Also, consider whether the entire set of data that is being returned is actually needed. If not, use the query expression functions to select which fields to return

The full text can be found here:

https://docs.appian.com/suite/help/20.3/Post-Install_Configurations.html#query-limits

RE: Process instances are stucked while querying data from a View in database.

Stefan Helzle — Thu, 05 Nov 2020 20:38:18 GMT

There is another limit

docs.appian.com/.../Configuring_Relational_Databases.html

RE: Process instances are stucked while querying data from a View in database.

anupriyak0002 — Thu, 05 Nov 2020 17:45:10 GMT

Hi Stefan,

the query execution time limit is 10 sec as per link given by you, but my query rule is taking 1607 ms =1.607 sec for execution,when I test the query rule, then it works fine, it gives me result in 1607 ms, but in process instance , where this rule is called, that instance stucked while running the process.

its gives error:

An error occurred while evaluating expression: =rule!x(y: rule!z(y: pv!y),y: pv!y) (Expression evaluation error in rule 'p' at function a!queryEntity_18r3 [line 9]: An error occurred while retrieving the data.) (Data Inputs)

In logs its saying as:

could not execute query

Statement cancelled due to timeout or client request
Please suggest.

RE: Process instances are stucked while querying data from a View in database.

Stefan Helzle — Mon, 02 Nov 2020 10:47:26 GMT

There are certain limitations. Loading 50k rows into Appian feels not like being a good idea. This might give you a hint.

https://docs.appian.com/suite/help/20.3/Querying_Data_From_an_RDBMS.html#other

Did you check the Appian logs and process monitoring for error messages?