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Production Perfomance of using SELECT * statements?


Production Perfomance of using SELECT * statements?

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Production Perfomance of using SELECT * statements?
Tag : sql , By : Joe
Date : November 24 2020, 05:44 AM


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Perfomance issues just on production database


Tag : performance , By : Jaya
Date : March 29 2020, 07:55 AM
To fix this issue The Test database indexes properties include IOT_REDUNDANT_PKEY_ELIM and DROPPED columns but not the production indexes. These columns were added in oracle 10g.
Is perhaps the production database running under the old 9i version and the test database under 10g ? If so, I'd consider that a more significant difference than anything else.

MySQL perfomance issues in SELECT


Tag : mysql , By : RinKaMan
Date : March 29 2020, 07:55 AM
With these it helps A simple database: , Create an index on the code column:
ALTER TABLE data ADD INDEX (code)

Improve perfomance when select list


Tag : chash , By : Robert Daniel Pickar
Date : March 29 2020, 07:55 AM
will help you Here's a Join-based method that should achieve the same thing, but faster:
public static IList<MedicalRecord> UpdateServicePrice(
    IList<MedicalRecord> mListMedicalRecord,
    IList<ServicePrice> listAllServicePrice)
{
    foreach (var j in mListMedicalRecord.GroupJoin(listAllServicePrice,
        mr => mr.MedicalRecordID,
        sp => sp.MedicalRecordID,
        (mr, sps) => new { Record = mr, Prices = sps }))
    {
        j.Record.mListServicePrice = j.Prices.ToList();
    }
    return mListMedicalRecord;
}

Improve Select perfomance and readability


Tag : sql , By : Zelos
Date : March 29 2020, 07:55 AM

Union all of 200 select statements failing to even execute. No error thrown. Limitation of number of select statements i


Tag : sql , By : Sigtryggur
Date : March 29 2020, 07:55 AM
like below fixes the issue Because of the limitations we have in Amazon Redhshift SQL (which is based on PostgreSQL 8.0.2). I am forced to execute the following query for some other complex query purposes: , How about this way using generate_series() without using 200 unions?
CREATE TEMP TABLE NS AS SELECT * FROM generate_series(1, 200)
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