[Video] Office Hours: Stump Me With Your Data Questions

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There are only a couple weeks left in this summer’s marathon of Office Hours sessions, which means there’s limited time left to ask your toughest database problems (not trivia questions) at https://pollgab.com/room/brento.

Here’s what we covered in this episode:

  • 00:00 Start
  • 03:22 tanchenglai: Hi Brent, I have implemented a system that records data in another factory. When changing shift, the data cannot be inserted into DB. I suspected due to too many machines causing the storage problem (hardware issue). How could convince the hardware guys to upgrade server storage?
  • 05:44 MooneyFlyer: Hi Brent! Do you have any recommendations on how to manage self-referencing tables? Say an Org Chart and queries like “Does this employee have this manager in its hierarchy?”. I usually solved this with recursive CTE, but I’m concerned about performance. Sorry for the WofT!
  • 06:28 Juan Falcon: We are heavily invested in SSRS 2019. Should we be looking at other options/products for when we jump to SQL Server 2022? Please advise.
  • 08:01 BeanZW: Using Merge statement for Update, Insert and Delete from source to target with the selected date time in target table. Is that the correct way using Merge?
  • 10:07 Benbo Baggins: DBA’s believe indexes are a function of data not schema, will change over time and vary between clients depending on their data usage. Dev’s believe that they are a function of schema and should be defined to suit the data and application. What are your thoughts?
  • 10:54 RoJo: We have 12 remote Devs that use our Dev SQL DB to develop on. Is there a way to safely allow this on the Internet without giving VPNs to every Dev? or other options for sane development remotely ?
  • 12:58 Era Istrefi: What criteria do you use to decide if a given foreign key should have a supporting index or not?
  • 13:52 StatisticallyUncertain: If there are any, what are come cases should automatic statistics creation should be disabled?
  • 16:25 Jiun: Hi Brent, I’ve a SQL procedure that my web site will call. The procedure executes a Java script. My problem is that it’s taking too long to execute (about 6 seconds), and over half of the run time is spent importing libraries and loading objects for the script to use.
  • 17:38 Azul: What are the pros / cons of all devs sharing a single SQL Server instance vs hosting their own instance which they keep in sync / up to date? Which do you recommend?
  • 19:32 Nora Istrefi: When should a computed column be persisted?
  • 22:55 johnkurt: Non-cluster index has pointers to the clustering index in a rowstore table or rowid to a heap-tabel. How is the connection between Non-cluster and cluster on a cluster-column store index ?
  • 23:56 Rani Mukerji: What is your opinion of PowerBI vs Tableau?
  • 25:50 T: Best DR solution for SQL Server 2019 Standard Edition
  • 26:30 Dua: What is your opinion of using TSQL merge statement to update DW dim target table via source staging table?
  • 26:47 Dhurata Dora: What is the best resource for learning about modeling DIM and FACT tables in SQL Server?
  • 28:02 DBA with MBA: Have you run into issues with Nutanix? Our 1TB DB (Mfg production OLTP, not super busy), after restore to more $ Nutanix (3-4 nodes), runs ~30% SLOWER on default settings due to Nutanix’s difference with HyperV/SAN. Vendor suggests like splitting MDF into many vDisks and more.TIA
  • 28:53 DKKimbo: We keep getting query store going read only after an internal filestream error message is logged. File stream isn’t enabled, have you seen filestream cleanup errors on systems that don’t have it enabled?
  • 29:55 lucky12345: Does the closed source nature of MSSQLServer make it less vulnerable to hacking attempts when compared to PostgreSQL?
  • 30:19 Neithan: This may be irrelevant but can you explain what’s the point of the isolation level? And why aren’t everything Serializable?
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4 Comments. Leave new

  • agreed on teams. Most powerful weapon in middle management’s arsenal to waste people’s time even when something in it is not working on a regular basis

    Reply
  • O, that crap about SERIALIZABLE again.
    I wonder if you know which isolation level TPC-C and TPC-E tests run under?
    The ones that get ten thousands TPS, you know?

    Reply
    • https://www.tpc.org/tpc_documents_current_versions/pdf/tpc-e_v1.14.0.pdf

      I don’t know if that will link but there is documentation for the isolation level of each test. They use all the isolation levels except for read uncommitted, most of the tests are done at read committed

      Reply
      • hen note this:

        “The Performance Metric reported by TPC-E is a “business throughput” measure of the number of completed Trade-Result transactions processed per second (see Clause 6.7.1).”

        During the Test Run, each TPC-E Transaction must provide a level of isolation from Arbitrary
        Transactions that is at least as restrictive as the level defined in the table below:

        Trade-Result: L3

        And L3 is SERIALIZABLE. So, yet again — how comes?

        Reply

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