By JeffG-Oracle on Jan 09, 2015
It was discovered that the engine throws a segmentation fault while running CDP consumption profile. Please see the additional information in the readme Notes.
Hello Demantra Customer! There is a new release of the Demantra Performance and Setup Analyzer! Version 2.00 has been released!
You can pick and choose any SQL that you prefer to see given any type of task at hand. See MyOracleSupport note
Demantra Analyzer script for Setup and Performance Monitoring (11.5.X and R12), 1618885.1
I am considering adding more topical analysis and deeper digging into additional details for the next release.
Any questions / comments, please email Jeffery.email@example.com
Linux Engine Crashes When Receiving Simulation Request After configuring Calendar Month, See MOS Note 1684019.11684019.1
Customer mentions that the engine was running fine until they implemented a change since the last successful engine run: they set up the month calendar.
Now the engine crashes (the Engine.exe process ends and then restarts) when receiving a simulation request.
Nothing is reported as error on the simulation worksheet. The process status is "started". A second simulation request will crash the newly started process.
This happens on both modes(batch and simulation run) which cause the Engine process to crash
Checked the Engine Manager web application is started
Checked EngineStarter is running
Started the simulation engine:which Returns -1
Checked Engine process is running: ps -e | grep Engine
Shows EngineStarter and Engine running
Open a worksheet and started simulation for the selected combination
Process monitor shows status "running"
The Engine process crashes, and ps command returns only EngineStarter
Engine restarts on its own (Engine process is seen again when checking with ps)
Engine logs show the engine is frozen (no new logged info once initialized)
When customer changed EnginePlatform to 0 and executed the batch and simulation engine on Windows, the simulation run didn't crash the engine, but no forecast was generated due to errors:
ERROR Failed to execute : ProcFillArrays. ExecuteHook threw Matlab exception: All matrices on a row in the bracketed expression must have the same number of rows.
ERROR Failed to execute : ProcForecast9. ExecuteHook threw Matlab exception: Matrix dimensions must agree.
Do you know what these values are telling you?
Check out The Column Prediction_Status, MDP_Matrix and Engine. How are they Related? Understand Prediction_status Values (Doc ID 1509754.1)
This customer is adding an additional processing burden, adding no value. The incoming data should be scrubbed to eliminate the overhead.
Did you know that there is a 21 point checklist to ensure that your engine will run correctly? Check out note 1086704.1 in My Oracle Support.
WARNING Retrying Bulk Insert for file:sqlldr due to Communication Error:256
I am running my engine on Linux and am receiving an intermittent message
"WARNING Retrying bulk insert for file: sqlldr due to communication Error: 256"
The engine seems to have completed successfully, but it is not clear if this error caused some of the forecast to not complete. It is also not clear what caused the error.
Generally if you see only the WARNING of it, it means that next retries of the same load request have eventually succeeded and so the run a a whole is not affected.
In order to know more about what happens, look for .log/.bad files left in the engines bin directory or possibly a quote of them within the specific engine log that had the issue. The sqlnet.log file may also have some information about it and perhaps at the database server side there may be some log/alert regarding what happened. Look at the alert.log.
In general it could be that the database server/network was over loaded at the time and somehow the connection was rejected/failed/aborted either due to specific setting on concurrent connections/sessions or inadvertently due to glitch in network/os/hardware.
If this repeats and becomes more frequent during the run you should look further into it as mentioned above.
You can also track this using either SQL*Trace or java.util.logging.
- Globally enable logging by setting the oracle.jdbc.Trace system property java -Doracle.jdbc.Trace=true
- Client Side Tracing:
Your SQLNET.ORA file should contain the following lines to produce a client side trace file:
trace_level_client = 10
trace_unique_client = on
trace_file_client = sqlnet.trc
trace_directory_client = <path_to_trace_dir>
Server Side Tracing:
To enable server side tracing, use the following parameters:
trace_level_server = 10
trace_file_server = server.trc
trace_directory_server = <path_to_trace_dir>
The following values can be used for TRACE_LEVEL* parameters:
16 or SUPPORT — WorldWide Customer Support trace information
10 or ADMIN — Administration trace information
4 or USER — User trace information
0 or OFF — no tracing, the default
Additional information is readily available via the web.
There is a new Demantra engine configuration checklist to ensure that your enginge setup and configuration is correct. These are the questions that
development will ask should your issue turn into a bug. See the following MyOracleSupport note:
Demantra Engine on Linux or Unix Failure Hanging Error Not Starting Debugging Install and Configuration Checklist Note ID 1086704.1
New 188.8.131.52 parameter: TargetTaskSize
Old parameter: BranchID Multiple, deprecated 184.108.40.206 onwards
Parameter Location: Parameters > System Parameters > Engine > Proport
Engine Mode: Both
Details: Specifies how many MDP_MATRIX combinations the analytical engine attempts to assign to each forecasting task. Allocation will be affected by forecsat tree branch size. TaskTargetSize is automcatically calculated. It holds the perferred branch size, in number of combinations in the lowest level.
This parameter is adjusted to a lower value for smaller schemas, depending on the number of available engines.
- As the forecast is generated the engine goes up the tree using max_fore_level and not top_level -1. Max_fore_level has
to be less than or equal to top_level -1. Due to this requirement, combinations falling under the same top level -1
member must be in the same task. A member of the top level -1 of the forecast tree is known as a branch. An engine
task is therefore comprised of one or more branches.
- Reveal current task size
go to Engine Administrator --> View --> Branch Information and run the application on your Demantra schema. This will be deprecated in 220.127.116.11 since there is no longer a means of adjusting the brach size directly. The focus is now on proper hierarchy / forecast design.
- Control of tasks
The number of tasks created is the lowest of number of branches, as defined by top level -1 members in forecast
tree, and engine sessions and the value of TargetTaskSize. You are used to using the branch multiplier in this
calculation. As of 18.104.22.168, the branch ID multiple is deprecated.
- Discovery of current branch size
To resolve this you must review the 2nd highest level in the forecast tree (below highest/highest) as this is the
level which determines the size of the branches. If a few resulting tasks are too large it is recommended that
the forecast tree level driving branches be revised or at times completely removed from the forecast tree.
- Control of foreacast tree branch size
- Run the following sql to determine how even the branches are being split by the engine:
select count(*),branch_id from mdp_matrix where prediction_status = 1 and do_fore = 1 group by branch_id;
This will give you an understanding if some of the individual branches have an unusually large number of
rows and thus might indicate that the engine is not efficiently dividing up the parallel tasks.
- Based on the results of this sql, we may want to adjust the branch id multiplier and/or the number of engines
(both of these settings are found in the Engine Administrator)
select count(*), level_id from mdp_matrix where prediction_status = 1 and do_fore = 1 group by level_id;
This will give us an understanding at which level of the Forecast tree where the forecast is being generated.
Having a majority of combinations higher on the forecast tree might indicate either a poorly designed forecast
tree and/or engine parameters that are too strict
Based on the results of this we would adjust the Forecast Tree to see if choosing a different hierarchy might
produce a forecast, with more combinations, at a lower level.
- Review the 2nd highest level in the forecast tree, below highest/highest, as this is the level which
determines the size of the branches.
- If a few resulting tasks are too large it is recommended that the forecast tree level driving branches
be revised or at times completely removed from the forecast tree.
- For example, if the highest level of the forecast tree is set to Brand/All Locations.
- You have 10 brands but 2 of the brands account for 67% and 29% of all combinations.
- There is a distinct possibility that the tasks resulting from these 2 branches will be too large for
a single engine to process. Some possible solutions could be to remove the Brand level and instead
use a different product grouping which has a more even distribution, possibly Product Group.
- It is also possible to add a location dimension to this forecast tree level, for example Customer.
This will also reduce forecast tree branch size and will deliver a balanced task allocation.
- A correctly configured Forecast Tree is something that is done by the Implementation team and is
not the responsibility of Oracle Support.
Allocation will be affected by forecast tree branch size. When TargetTaskSize is set to 0, the default value, the system
automatically calculates a value for 'TargetTaskSize' depending on the number of engines.
- QUESTION: Does this mean that if TargetTaskSize is 1, we use tree branch size to allocate branches to tasks instead
of automatically calculating the size?
ANSWER: DEV Strongly recommends that the setting of TargetTaskSize remain at the DEFAULT of ZERO (0).
- How to control the number of engines?
Determine how many CPUs are on the machine(s) that is (are) running the engine. As mentioned earlier, the general
rule is that you should designate 2 engines per each CPU that is available. So for example, if you are running the
engine on a machine that has 4 CPU then you can have up to 8 engines designated in the Engine Administrator. In this
type of architecture then instead of having one 'localhost' in your Engine Settings Screen, you would have 'localhost'
repeated eight times in this field.
Where do I set the number of engines?
To add multiples computers where engine will run, please do a back-up of Settings.xml file under
Analytical Engines\bin\ folder, then edit it and add there the selected machines.
Example, this will allow 3 engines to start:
<Key argument="ComputerNames" />
<Value type="string" argument="localhost,localhost,localhost" />
Otherwise, if there are no additional engines defined, the calculated value of 'TargetTaskSize' is used.
(Oracle does not recommend changing the default value.)
The TargetTaskSize holds the engines prefered branch size, in number of level 1 combinations.
- Level 1 combinations, known as group size
The engine manager will use this parameter to attempt creating branches with similar size.
* The engine manager will not create engines that do not have a branch.
The engine divider algorithm uses the value of 'TargetTaskSize' as a system-preferred branch size to create branches that
are more equal in size which improves engine performance. The engine divider will try to add as many tasks as possible to
an existing branch, up to the limit of 'TargetTaskSize' level 1 combinations, before adding new branches.
Coming up next:
- The engine divider
- Group size
- Level 1 combinations
- Engine Parameters
Hello! This is the latest from the Oracle Proactive Services Team. This presentation will guide you to interpreting the enginewk log file. Specifically, when you have a performance issue with the engine, is it the database or the engine itself.
Look for more diagnostics soon!
Proactive Services Community Doc, Avoiding the Unexpected with Proactive Services
1. Verify that the DP shape causals were defined on the relevant BATCH (or parent BATCH profile in case of simulation) and not only on profile 0. Profile 0 is only used as template when creating new profiles.
This is common for customers that upgraded from versions that did not support profile IDs.
2. Check if the "CONSTANT" causal is missing in the CAUSAL_FACTORS table. Run the next query (modify the profile id value if needed):
select * from causal_factors where engine_profiles_id=1
If no row has 'CONSTANT' value in the factor_name column, it should be added.
When not all engines were started yet, due to the 10 seconds delay between each and first branch already finished. Engine Manager will crash and stop the run. Workaround: decrease number of branch multiplier so branches will be larger or decrease number of engines in parralel if multiplier is already 1.
1. During the work on the ptp tuning project, I've come up against following error:
creating Promotions Data Engine? table
ERROR DB_Connection::Execute threw an exception:
ERROR alter table PDE_6 add constraint PDE_6_PK primary key (item_id,location_id,sales_date,promo_id)
ERROR - Error Description?: ORA-02437: cannot validate (YOURCOMPANY_APR11.PDE_6_PK) - primary key violated
ERROR - Error Number?: 0x80004005 - Unspecified error
ERROR - Native Error Number?: 2437
ERROR Execute SQL? failed: alter table PDE_6 add constraint PDE_6_PK primary key (item_id,location_id,sales_date,promo_id)
WARNING Failed to create indices on PDE table, possibly due to duplicate/NULL values, please verify related expressions in M3_CAUSAL_FACTORS and 'Init Params.Shift Dyn Promo Date?'.
The source of this issue was found in group by expression of create PDE Sql. That expression included promotion_type_id. Customer schema had same promotion on same combination at same date with different promotion types. So SQL inserted two rows to PDE_X table with same combination/promotion_id/date. After that it tried to add constraint of primary key item/location/promotion_id/sales_date and failed because of duplicate rows with same primary key.
In general it is a configuration error of customer that inserted different promotion types with same promotion_id. But engine should know to handle it or to produce some meaningful error.
As a workaround in one of the bugs DEV proposed the following : Configure Analytical Level Type? parameter in Init_Params_0 table, set value_string to be IS_SELF instead of PROMOTION_TYPE_ID.
2. During the work on patch. Price causal treatment was modified. Currently engine should use its default expression in case this causal is active.
Some customers schemas have a unique expression for price causal and engine has a problem to parse it in a right way that cause to engine errors from sql.
ERROR DB_Command::Execute threw an exception:
ERROR SELECT sales_date datett, round(NVL
nvl(demand_fact,0)),0)),sum(FORE_3)),6) sales, ......................
ERROR - Error Description?: ORA-00909: invalid number of arguments
Bug 12604957 was opened and resolved in 22.214.171.124. In case you cannot apply the fix, use workaround and set price expression to a default one.
If you need to establish the status of the engine, begin with this SQL:
select status, engine, engine_version,fore_column_name
The status of an engine run is stored in the FORECAST_HISTORY table, in the “status” field. We can also find in that table the FORE_COLUMN_NAME field. This field includes the name of the column in SALES_DATA in which the relevant forecast is stored.
Here are the possible statuses:
-1, -2 : The engine failed in the initialization phase. Which means, before the engine manager created the engines.
0 : The engine stopped in the optimization phase. Which means, after the engines were created.
1: The engine finished the run successfully.
2: Forecast was never calculated for the relevant column that is mentioned in FORE_COLUMN_NAME.
This blog delivers the latest information regarding performance and install/upgrade. Comments welcome