Re: [MS_AccessPros] Looking for Access performance suggestions

 

I agree with Stuart..  If you converted it to MSSQL, or even MYSQL, You could execute these SQL as pass-through, and have the SQL Engine which is far better at huge datasets like this and I"m thinking you could trim that down to say, less than an hour?  Maybe a few minutes?

-Brian

On Tuesday, December 4, 2018, 5:21:50 PM EST, Stuart Schulman stoughy@yahoo.com [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:

 

Access is not all that great when the tables get this large.   Would suggest moving to SQL and stored procedures.

Stuart

On Tuesday, December 4, 2018, 4:56:02 PM EST, crystal 8 strive4peace2008@yahoo.com [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:

 

primary keys is not necessary for AutoNumbers -- just unique index

On 12/4/2018 3:54 PM, crystal 8 wrote:

hi Brooks,

I would suggest adding AutoNumber primary keys (with unique index) and Long Integer Foreign keys (default value=Null, index that allows duplicates and ignores null) with a set of queries to update the foreign keys. Then use the Long Integers to link. Add fields to the end if you import and other fields need to be in a certain order. This will greatly enhance performance.

Size:
AutoNumber/Long Integer = 4 byte
2 dates, a long number and a 1 character text fields = 2*8 + 4 + ? --> more than 20

So just by doing this, each join will be at least 5 times faster. The indexes will help speed it up too.

~crystal

On 12/4/2018 3:14 PM, brooksrimes@bigfoot.com [MS_Access_Professionals] wrote:

Hi Crystal,

Thanks for the post.

Unfortunately, the 3 million row tables needs 4 fields for the primary key: 2 dates, a long number and a 1 character text fields.

The frontend and backend are both on my Dell laptop with a Intel Core i5 processor and 8 GB of RAM.  I just upgraded from a HDD to a SSD and there was only a 9% reduction in run time.  

I compact and repair regularly.  I've been using Access since 1.0.  

A separate database server running SQL Server is probably an option.

Brooks

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Re: [MS_AccessPros] BEST EIGHT SUBJECTS

 

is this for a school assignment? If so, what is your major, and why are you learning Access? Otherwise, what is the purpose to get this information?

thanks,
crystal

On 12/4/2018 5:59 PM, Adeboyejo Oyenuga aoye_99@yahoo.co.uk [MS_Access_Professionals] wrote:

Dear Pros,

kindly suggest modification to the SQL below, if I intend to select the best eight subjects and Math, CSPE, Greek and English are compulsory among the eight.

Thanks.

Ade

SELECT [EXAMINATION RECORDS].STUDENTID, [EXAMINATION RECORDS].[STUDENT EXAM NO], [EXAMINATION RECORDS].SUBJECT, [EXAMINATION RECORDS].MARKS

FROM [EXAMINATION RECORDS]

WHERE ((([EXAMINATION RECORDS].SUBJECTID) In (SELECT TOP 5 [SUBJECTID]

FROM [EXAMINATION RECORDS] ER

WHERE ER.[STUDENT EXAM NO] = [EXAMINATION RECORDS].[STUDENT EXAM NO]

AND SUBJECT <> "MATH"

ORDER BY MARKS DESC, SUBJECT))) OR ((([EXAMINATION RECORDS].SUBJECT)="MATH"));

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Posted by: crystal 8 <strive4peace2008@yahoo.com>

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[MS_AccessPros] BEST EIGHT SUBJECTS

 

Dear Pros,

kindly suggest modification to the SQL below, if I intend to select the best eight subjects and Math, CSPE, Greek and English are compulsory among the eight.

Thanks.

Ade

SELECT [EXAMINATION RECORDS].STUDENTID, [EXAMINATION RECORDS].[STUDENT EXAM NO], [EXAMINATION RECORDS].SUBJECT, [EXAMINATION RECORDS].MARKS

FROM [EXAMINATION RECORDS]

WHERE ((([EXAMINATION RECORDS].SUBJECTID) In (SELECT TOP 5 [SUBJECTID]

FROM [EXAMINATION RECORDS] ER

WHERE ER.[STUDENT EXAM NO] = [EXAMINATION RECORDS].[STUDENT EXAM NO]

AND SUBJECT <> "MATH"

ORDER BY MARKS DESC, SUBJECT))) OR ((([EXAMINATION RECORDS].SUBJECT)="MATH"));

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Posted by: Adeboyejo Oyenuga <aoye_99@yahoo.co.uk>

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Re: [MS_AccessPros] Looking for Access performance suggestions

 

Access is not all that great when the tables get this large.   Would suggest moving to SQL and stored procedures.

Stuart

On Tuesday, December 4, 2018, 4:56:02 PM EST, crystal 8 strive4peace2008@yahoo.com [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:

 

primary keys is not necessary for AutoNumbers -- just unique index

On 12/4/2018 3:54 PM, crystal 8 wrote:

hi Brooks,

I would suggest adding AutoNumber primary keys (with unique index) and Long Integer Foreign keys (default value=Null, index that allows duplicates and ignores null) with a set of queries to update the foreign keys. Then use the Long Integers to link. Add fields to the end if you import and other fields need to be in a certain order. This will greatly enhance performance.

Size:
AutoNumber/Long Integer = 4 byte
2 dates, a long number and a 1 character text fields = 2*8 + 4 + ? --> more than 20

So just by doing this, each join will be at least 5 times faster. The indexes will help speed it up too.

~crystal

On 12/4/2018 3:14 PM, brooksrimes@bigfoot.com [MS_Access_Professionals] wrote:

Hi Crystal,

Thanks for the post.

Unfortunately, the 3 million row tables needs 4 fields for the primary key: 2 dates, a long number and a 1 character text fields.

The frontend and backend are both on my Dell laptop with a Intel Core i5 processor and 8 GB of RAM.  I just upgraded from a HDD to a SSD and there was only a 9% reduction in run time.  

I compact and repair regularly.  I've been using Access since 1.0.  

A separate database server running SQL Server is probably an option.

Brooks

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Posted by: Stuart Schulman <stoughy@yahoo.com>

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Re: [MS_AccessPros] Looking for Access performance suggestions

 

primary keys is not necessary for AutoNumbers -- just unique index

On 12/4/2018 3:54 PM, crystal 8 wrote:

hi Brooks,

I would suggest adding AutoNumber primary keys (with unique index) and Long Integer Foreign keys (default value=Null, index that allows duplicates and ignores null) with a set of queries to update the foreign keys. Then use the Long Integers to link. Add fields to the end if you import and other fields need to be in a certain order. This will greatly enhance performance.

Size:
AutoNumber/Long Integer = 4 byte
2 dates, a long number and a 1 character text fields = 2*8 + 4 + ? --> more than 20

So just by doing this, each join will be at least 5 times faster. The indexes will help speed it up too.

~crystal

On 12/4/2018 3:14 PM, brooksrimes@bigfoot.com [MS_Access_Professionals] wrote:

Hi Crystal,

Thanks for the post.

Unfortunately, the 3 million row tables needs 4 fields for the primary key: 2 dates, a long number and a 1 character text fields.

The frontend and backend are both on my Dell laptop with a Intel Core i5 processor and 8 GB of RAM.  I just upgraded from a HDD to a SSD and there was only a 9% reduction in run time.  

I compact and repair regularly.  I've been using Access since 1.0.  

A separate database server running SQL Server is probably an option.

Brooks

__._,_.___

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Posted by: crystal 8 <strive4peace2008@yahoo.com>

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