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About rebuilding houses
| Message |
Score |
Author |
Date |
   Hi,
I have found in few houses policies to rebu...... |
|
Lauri |
Jan 22, 2019, 16:30 |
| Hi Lauri,
For DWH environments the rules might ...... |
|
Philip Wisse |
Jan 24, 2019, 10:07 |
| I rarely rebuild indexes, but frequently update st...... |
|
Rob Pattyn |
Jan 24, 2019, 10:24 |
| Hi,
Thanks for the answers.
@Philip:
Yes, I a...... |
|
Lauri |
Jan 24, 2019, 11:23 |
| Hello,
you touched a very huge topic without a ...... |
  |
Matej Pagac |
Jan 25, 2019, 15:02 |
| Hi,
Thanks for the answers.
@Matej: I agree wi...... |
|
Lauri |
Feb 07, 2019, 13:22 |
| Subject: |
About rebuilding houses |
| Author: |
Lauri, Netherlands |
| Date: |
Jan 22, 2019, 16:30, 319 days ago |
| Os info: |
all |
| Oracle info: |
12c |
| Error info: |
NA |
| Message: |
Hi,
I have found in few houses policies to rebuild regularly indexes in datawarehouse environments.
This is usually resource and time consumming.
Until now, this is something I had never to consider, relying on the Oracle engine to do that job.
Does someone has experience in rebuilding indexes?
Kind Regards
|
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| Subject: |
Re: About rebuilding houses |
| Author: |
Philip Wisse, Netherlands |
| Date: |
Jan 24, 2019, 10:07, 318 days ago |
| Message: |
Hi Lauri,
For DWH environments the rules might be different.
1. The ETL process has to be as quick as possible
2. During the Reporting Window no other activity allowed but reporting
If there's any time left in a day you can schedule database maintence, whatever.
If you have a near realtime system you have to limit maintenance to a minimum of course.
HTH, Philip |
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| Subject: |
Re: About rebuilding houses |
| Author: |
Rob Pattyn, Belgium |
| Date: |
Jan 24, 2019, 10:24, 318 days ago |
| Message: |
I rarely rebuild indexes, but frequently update statistics.
Fragmentation isn't usually the problem as the data is on a smart storage device (black box, ssd, ...)
https://www.brentozar.com/archive/2017/11/good-reasons-rebuild-reorganize-indexes/ |
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| Subject: |
Re-About rebuilding houses |
| Author: |
Lauri, Netherlands |
| Date: |
Jan 24, 2019, 11:23, 318 days ago |
| Message: |
Hi,
Thanks for the answers.
@Philip:
Yes, I agree that in DWH environments the rules might be different.
Indexes are usually dropepd or set as unusable before the load.
@Rob:
Yes, this is something that I rarely do.
But what about DWH environments types?
Any other experience to share?
Kind Regards
|
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| Subject: |
Re: About rebuilding houses |
| Author: |
Matej Pagac, Slovakia |
| Date: |
Jan 25, 2019, 15:02, 316 days ago |
| Score: |
|
| Message: |
Hello,
you touched a very huge topic without a definite answer.
I would suggest you to read several forum threads on asktom about this, as "it all depends" :)
So for every specific scenario there's specific answer. It;s not straight forward that this type of DWH required this type of index maintenance. Just a general guidance on what to focus the most.
https://asktom.oracle.com/pls/apex/asktom.search?tag=rebuilding-indexes-200202
https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:6601312252730
and so on..
mTj |
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| Subject: |
Re-About rebuilding houses |
| Author: |
Lauri, Netherlands |
| Date: |
Feb 07, 2019, 13:22, 304 days ago |
| Message: |
Hi,
Thanks for the answers.
@Matej: I agree with you... huge topic without a definite answer.
In the meantime I found my way:
1) I do not rebuild indexes for low-DML, especially when it concerns bitmap indexes.
2) I do rebuild the indexes when the table is truncated, expecially if this table has bitmap indexes; even if it is a small table.
Kind Regards
|
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