Same query, different results depending on compute statistics!!!

This one is really weird, you would think I am making this up but I am not...
We have one really long query that uses several large inline views and usually returns a few rows. All of a sudden the query stopped working -- i.e. it returned no rows. We tried rebuilding indexes; this didn't help. We tried computing full statistics and this fixed the problem. Has anyone heard of compute statistics affecting the output of a query????
About a week later, the problem happened again. Computing estimate statistics didn't help. Only computing full statistics fixed the problem.
The only thing I can note, is that this database was recently upgraded from 9.2.0.6 to 9.2.0.7, but I checked the install log files and there are no errors.
Luckily this is just a development database but we are a little worried that it might re-occur in production. We have a few other development databases that have also been upgraded to 9.2.0.7 and none of these have the problem.
We have compared the init.ora files, no real differences. Any other ideas? Maybe a full export import?

Thanks, will do, but I am a little doubtful it is
fixed by 9.2.0.8 because it works on one of our
9.2.0.7 environments... Although if it is a statistics issue, it's likely a corner case, so you have to have a number of things in alignment. It's quite possible that, for example, two systems have identical structures and identical data but slightly different query plans because the data in one table is physically ordered differently on one system than in another which slightly changes the clustering_factor of an index which causes the CBO to use that index on one system and not on another. You may also end up with slightly different statistics because you have histograms on a column in one system and not in another.
Looks like we are going to 9.2.0.8 anyway because of
the end-of-life service support forcing us to go to
9.2.0.8 anyway.If it reproduces on 9.2.0.8 (and I'd tend to suspect it will), it's certainly worth raising an issue. Unless you have an extended support contract, though, I wouldn't hold out a lot of hope for a patch if this isn't already fixed, since 9.2 leaves Premier Support at the end of the month...
Justin

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A massive difference in logical reads usually hints at differences in the query plan.
When you compare query plans, it is essential that you look at actual query plans.
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Duplicate thread
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Gints Plivna
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Iuliana

Please chacek all the InfoObjects in rows and columns in both Queries and Formulas/CKFs/RKFs/ and variavles too....Definetly there will be a difference..so you are getting different results...all calculated kfs in both Queries using same formulas?
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Hi,
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Post Author: smash
CA Forum: General
Hi, thanks for any help you can give.
I have a report that when I print from the crystal designer, it prints exactly like I want it. The report is using a Courier 10cpi font. When I export to pdf or export directly to the printer, the report is printed with an Arial font. I have the courier on the server and the client machines and I am printing to a IBM 6500 feed printer.
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Thanks, will do, but I am a little doubtful it is
fixed by 9.2.0.8 because it works on one of our
9.2.0.7 environments... Although if it is a statistics issue, it's likely a corner case, so you have to have a number of things in alignment. It's quite possible that, for example, two systems have identical structures and identical data but slightly different query plans because the data in one table is physically ordered differently on one system than in another which slightly changes the clustering_factor of an index which causes the CBO to use that index on one system and not on another. You may also end up with slightly different statistics because you have histograms on a column in one system and not in another.
Looks like we are going to 9.2.0.8 anyway because of
the end-of-life service support forcing us to go to
9.2.0.8 anyway.If it reproduces on 9.2.0.8 (and I'd tend to suspect it will), it's certainly worth raising an issue. Unless you have an extended support contract, though, I wouldn't hold out a lot of hope for a patch if this isn't already fixed, since 9.2 leaves Premier Support at the end of the month...
Justin

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Hi Matt,
Just to add a note to the great info from Scott. You can use the WCS to push this info out to all the WLC's using this method;
Configuring an Access Point Authorization Template
Follow these steps to add an access point authorization template or make changes to an existing template. These templates are devised for Cisco 11xx/12xx series access points converted from IOS to LWAPP or for 1030 access points connecting in bridge mode.
Step 1 ï¿¼Choose Configure > Controller Templates.
Step 2 ï¿¼From the Security selections in the left sidebar menu, choose AP authorization.
Step 3 ï¿¼If you want to add a new template, choose Add Template from the Select a command drop-down menu and click GO. To make modifications to an existing template, click a MAC address in the AP Base Radio MAC column. The AP Authorization Template appears (see Figure 9-12), and the number of controllers the template is applied to automatically populates.
Step 4 ï¿¼Select the Import from File check box if you want to import a file containing access point MAC addresses.
ï¿¼
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Step 5 ï¿¼Enter the file path from where you want to import the file.
Step 6 ï¿¼Click Save.
From this doc;
http://www.cisco.com/en/US/docs/wireless/wcs/4.0/configuration/guide/wcstemp.html#wp1072945
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[code0]
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from J_8DG_4JLF.J_8DG_4JLF_JT
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group by J_8DG_4JLF.J_8DG_4JLF_DG7.LINE_REF, J_8DG_4JLF.J_8DG_4JLF_DG0.PRIMARY_CARD
having (
ROUND ( SUM(Case when J_8DG_4JLF.J_8DG_4JLF_DG0.LINE_INTERNAL_CODE BETWEEN 40 and 59 THEN 1 ELSE 0 END),0) > 0
AND
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[code0]
) t
LINE_INTERNAL_CODE is string

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Same query, different results depending on compute statistics!!!

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