One comment about your specific query. You have a "left outer join" against the patientaddress table. This can actually be written as an "inner join" with the same results since you are restricting the right side of the outer join with the where clause. You can try your query as an inner join and see if that improves your performance. The relational database engine probably optimized the query by re-writing it as an inner join. If you did not have the "a.State='LA'", then it would have to remain an outer join. The left outer join might be greatly effecting performance. Since you are also using group by and order by, the total amount of results might also effect the performance.
select c.Patientid, ClaimNumber, FirstName, LastName, sum (PharmacyTotalCost) as PharmacyTotalCost from claim c inner join patient p on c.patientid = p.patientid left outer join patientaddress a on p.patientid = a.patientid where a.[State] = 'LA' group by c.PatientId, ClaimNumber, FirstName, LastName order by SUM(PharmacyTotalCost) desc limit 10 Note: You can see a reference in mysql as an example about when outer joins can be re-written to inner joins: https://dev.mysql.com/doc/refman/5.0/en/outer-join-simplification.html Brad Rix | Technical Lead O: +1 303 542 2172 | M: +1 303 915 2771 Skype: Brad.Rix | Google Talk: bradford....@gmail.com<mailto:bradford....@gmail.com> From: general-boun...@developer.marklogic.com<mailto:general-boun...@developer.marklogic.com> [mailto:general-boun...@developer.marklogic.com] On Behalf Of Sara Mazer Sent: Monday, April 27, 2015 6:30 PM To: MarkLogic Developer Discussion; ji...@rdacorp.com<mailto:ji...@rdacorp.com> Cc: Scott Fowler; Walt Rolle Subject: Re: [MarkLogic Dev General] SQL Query Performance and Tableau Connection Hi Cynthia, My name is Sara Mazer, and I am a solutions consultant in the DC area. I've worked a lot with Tableau and MarkLogic and would like to set up some time to discuss your evaluation and give you some best practices so that you can get the best performance possible. I was the person who worked with Tableau to add MarkLogic as a named connection and supported their certification of MarkLogic, and I think I can help you. I have a too many best practices to go over by email, so I'd like to speak with you and walk you through setting up databases for successful analytics through WebEx. Would that be possible? I have a meeting from 9:30-11:00 but can move any other meeting I have tomorrow to suit your schedule, just let me know a good time for you. In general, I plan on: Recommending the best data model for MarkLogic of this type of data (hint: it doesn't look like what would be in an RDBMs) Showing you a demo of patient and claims data with Tableau and review how it was done Discussing the best practices of working with Tableau (minimize the data coming back from MarkLogic by using custom SQL for charts, using MATCH keyword, having Tableau do grouping/sorting instead of in SQL) Reviewing common connection issues between MarkLogic and Tableau and how to avoid them (most likely you are corrupting your SQL views:a best practice is to have a unique schema database for each MarkLogic database) Reviewing performance of XQuery/JavaScript vs. SQL in MarkLogic Best regards, Sara Mazer sara dot mazer "at" marklogic dot com This e-mail and any accompanying attachments are confidential. The information is intended solely for the use of the individual to whom it is addressed. Any review, disclosure, copying, distribution, or use of this e-mail communication by others is strictly prohibited. If you are not the intended recipient, please notify us immediately by returning this message to the sender and delete all copies. Thank you for your cooperation. From: general-boun...@developer.marklogic.com<mailto:general-boun...@developer.marklogic.com> [mailto:general-boun...@developer.marklogic.com] On Behalf Of Cynthia Jiang Sent: Monday, April 27, 2015 4:56 PM To: General@developer.marklogic.com<mailto:General@developer.marklogic.com> Cc: Walt Rolle Subject: [MarkLogic Dev General] SQL Query Performance and Tableau Connection Hello, We have been testing MarkLogic 8 downloaded from your website for a POC. Our environment is very straight forward. A single VM (windows 7 Enterprise - 64bit) with 16GM RAM and 2 Intel (E5-2690 v2) 3GHz processors. We have around 4 SQL tables that we modeled in Json format so each row ends up becoming a document, and here are some of the stats: Patient : 8 fields / 20,924 documents PatientAddress: 5 fields / 36,193 documents Claim: less than 30 fields / 335,349 documents ClaimDiagnosis: 2 fields / 8,676 documents We created element range index for all the fields, and created 4 views that each represent a SQL table. Then we were able to use SQL to query the data and get the result in the query console. But the performance is not nearly as what we expected, we thought it would work faster than SQL environment. A simple query like the one below took 30 seconds to run, and the same query took 3 seconds to run with a larger data set in a SQL environment with 6GB memory and 4 processors. select c.Patientid, ClaimNumber, FirstName, LastName, sum (PharmacyTotalCost) as PharmacyTotalCost from claim c inner join patient p on c.patientid = p.patientid left outer join patientaddress a on p.patientid = a.patientid where a.[State] = 'LA' group by c.PatientId, ClaimNumber, FirstName, LastName order by SUM(PharmacyTotalCost) desc limit 10 We also tested out the connection between MarkLogic and Tableau 9 trial version through MarkLogic 64 bit ODBC connector on the same VM. The connection is not stable, got lost very frequently, and sometimes it won't stop running for 20 minutes after adding one dimension and one simple measure the columns and rows shelves. We are under a very tight timeline and have to report our findings back to our client within 24 hours. With the current performance, we will not be able to recommend any MarkLogic product to our client. Please help us if there is anything that we could do to improve the SQL query performance and data connectivity between Tableau and MarkLogic. Also, for the query as the simple example above, is there any XQuery or Javascript Query that we can use that could produce the similar results? We cannot find any documented examples. Any help will be really appreciated! Thank you very much, Cynthia Jiang RDA Corpration
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