thank you for your reply.

I understand that in the storagemodel table (), the heapsize column shows the maximum size that can be used.
This size may also be obtained by multiplying the table storage columns "count" and "typewitdh"
This size should not logically be exceeded.
To detect fragmented columns do you think of this request ?

select "table","column","type","count",typewidth,columnsize,(heapsize/1021/1024) as mega,heapsize/(count*typewidth) as taux,heapsize,count*typewidth as heapsize_max FROM sys.storage  WHERE  heapsize > count*typewidth  AND heapsize > 100000 AND typewidth>0 AND count >0 ORDER BY taux ;

The bottom lines are the fields to be defragmented

Example with my database:

| src__at__tra__visites_agregees       | idvisite            | varchar |  47178937 |         1 |  188715748 |   321 |    7 |   335609856 |     47178937 |
| src__at__tra__visites_thomas         | idvisiteur          | varchar |   6310678 |        19 |   25242712 |   902 |    7 |   943718400 |    119902882 |
| test_integrite_tra                   | idvisite            | varchar |  19681703 |         2 |   78726812 |   266 |    7 |   278921216 |     39363406 |
| src__at__tra__visites                | idvisite            | varchar |  23134243 |         2 |   92536972 |   316 |    7 |   331350016 |     46268486 |
| src_inbox__at__tra__visites          | idvisite            | varchar |  22812014 |         2 |   91248056 |   310 |    7 |   324337664 |     45624028 |
| src__at__lm__visites                 | idvisite            | varchar | 331519688 |         1 | 1326078752 |  3513 |   11 |  3673489408 |    331519688 |
| test_integrite                       | idvisite            | varchar | 394962662 |         1 | 3159701296 |  4200 |   11 |  4392091648 |    394962662 |
| sc_septembre                         | idvisiteur          | varchar |  24155689 |        19 |  193245512 |  7224 |   16 |  7553548288 |    458958091 |
| sc_aout                              | idvisiteur          | varchar |  29586396 |        19 |  236691168 | 14449 |   26 | 15107031040 |    562141524 |
| src__at__tra__visites_thomas         | idvisite            | varchar |   6310678 |         2 |   25242712 |   402 |   33 |   420675584 |     12621356 |
+--------------------------------------+---------------------+---------+-----------+-----------+------------+-------+------+-------------+--------------+

Pierre

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De: "Martin Kersten" <Martin.Kersten@cwi.nl>
À: users-list@monetdb.org
Envoyé: Vendredi 24 Octobre 2014 14:59:36
Objet: Re: detect fragmented tables

On 24/10/14 10:37, Pierre-Adrien Coustillas wrote:
> Hello
Hi
>
> Before working with optimizer, Stethoscope and Tomograph, first I have to defragment the fragmented tables.
> How to detect fragmented tables?
The heap size is larger then the expected count would indicate.
> Write a script that reads heapsize column?
The storagemodel could give you hints on expected sizes.
>
> select *, (heapsize / 1021/1024/1024) as giga from sys.storage heapsize ORDER BY DESC LIMIT 20;
> What do you think?
select *, (heapsize / 1021/1024/1024) as giga from sys.storage order by heapsize desc limit 20;
>
> or a more specific sql query by reading the column "count", "typewidth", "ColumnSize" and "heapsize"?
>
regards, Martin
> thank
>
> Pierre
>
> --
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> 52 route de bischwiller
> 67300 Schiltigheim
> Société de Services et de Formations en Logiciels Libres
> http://1g6.biz
> Tél : 06 64 63 70 35
>
>
>
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