How to find out if your query uses the indexes?
How can one tell if the query being issued is using your indexes or doing full table scans?
Thank you.
Thank you.
Ok, let me see if I understand it. So, having an
index may not speed things up.True
Full table scans are not bad at all -- as I have it
in my head. The query I ran before was: select *
from table1;In that case an index would only slow things down; you are asking it to get all the information from the table - it has to read all of the table ( a full scan).
>
So full table scans and index have to do with the db
block size and the size of the row correct?
Block size and row size don't have a huge amount to do with it, but they do play a role.
Let me ask: How does one know the size of a row and
then the best option for the db blocks? Block size is a global setting (at the tablespace level I think). You would not likely change the block size based on the average row length in any one table. It would be about the last thing you might look at in terms of tuning (though you might consider it up-front if you had a huge amount of very predictable data).
>
And if, I create indexes and queries have the where
clause and the database uses full table scans then
does it means that either:
The database believes that the best execution plan is
to either do FULL SCANS OR USE INDEXES -- ALL UPTO
THE DATABASE?
No. There is another piece of information that the database needs to make good decisions. If for example you have a WHERE clause "WHERE not_paid = 1" and you have an index on not_paid. To make a good decision the database needs to know about how many of the rows are likely to be not_paid =1. If it's 90% then a full table scan will be cheaper than looking up the addresses of 90% of the rows and then getting the data. If it's 10% using the index will be cheaper. You need to use Analyze Tables to get the database to store this information. Looks like you need to use a bit of time with the manuals.
Jon
-J
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How to find out which sub query returns more than one row
Hi all,
Can any one give me clue ,how to find out which sub query returns more than one row in the following query .
/* Formatted on 2011/05/17 19:22 (Formatter Plus v4.8.8) */
SELECT a.*, ROWNUM AS rnm
FROM (SELECT DISTINCT '1' AS "Page View", ou.org_unit_name AS "Org",
prxm.mbr_idntfr AS "Beneficiary ID",
md.last_name
|| ', '
|| md.first_name AS "Beneficiary Name",
pci.idntfr AS "Tracking No.",
TO_CHAR (TRUNC (req.pa_rqst_date),
'MM/dd/yyyy'
) AS "Request Date",
sts.status_name AS "Status",
req.pa_rqst_sid AS "Request #",
prxm.mbr_sid AS "Mbr_sid",
TO_CHAR
(TRUNC (req.pa_revision_date),
'MM/dd/yyyy'
) AS "Last Updated",
TO_CHAR (psd.TO_DATE, 'MM/dd/yyyy') AS "TO_DATE",
prxpl.prvdr_lctn_iid AS "PRVDR_LCTN_IID",
pd.prvdr_sid AS "PRVDR_SID", 'Y' AS "State View",
DECODE
((SELECT DISTINCT pd.national_prvdr_idntfr
FROM pa_request_x_provider_location prxplo
WHERE prxplo.pa_rqst_sid =
req.pa_rqst_sid
AND prxplo.oprtnl_flag = 'A'
AND prxplo.pa_prvdr_type_lkpcd = 'RR'),
0, (SELECT prxplo.prvdr_lctn_idntfr
FROM pa_request_x_provider_location prxplo
WHERE prxplo.pa_rqst_sid = req.pa_rqst_sid
AND prxplo.oprtnl_flag = 'A'
AND prxplo.pa_prvdr_type_lkpcd = 'RR'),
NULL, (SELECT prxplo.prvdr_lctn_idntfr
FROM pa_request_x_provider_location prxplo
WHERE prxplo.pa_rqst_sid = req.pa_rqst_sid
AND prxplo.oprtnl_flag = 'A'
AND prxplo.pa_prvdr_type_lkpcd = 'RR'),
(SELECT DISTINCT pd.national_prvdr_idntfr
FROM pa_request_x_provider_location prxplo
WHERE prxplo.pa_rqst_sid =
req.pa_rqst_sid
AND prxplo.oprtnl_flag = 'A'
AND prxplo.pa_prvdr_type_lkpcd = 'RR')
) AS "NPI/ID",
DECODE
((SELECT pd.org_bsns_name
FROM pa_request_x_provider_location prxplo
WHERE prxplo.pa_rqst_sid = req.pa_rqst_sid
AND prxplo.oprtnl_flag = 'A'
AND prxplo.pa_prvdr_type_lkpcd = 'RR'),
NULL, (SELECT pd.last_name
|| ', '
|| pd.first_name
|| ' '
|| pd.middle_name
FROM pa_request_x_provider_location prxplo
WHERE prxplo.pa_rqst_sid = req.pa_rqst_sid
AND prxplo.oprtnl_flag = 'A'
AND prxplo.pa_prvdr_type_lkpcd = 'RR'),
(SELECT pd.org_bsns_name
FROM pa_request_x_provider_location prxplo
WHERE prxplo.pa_rqst_sid = req.pa_rqst_sid
AND prxplo.oprtnl_flag = 'A'
AND prxplo.pa_prvdr_type_lkpcd = 'RR')
) AS "Prvdr Name",
TO_CHAR (psd.from_date,
'MM/dd/yyyy'
) AS "Srvc From Date",
TO_CHAR (req.validity_start_date,
'MM/DD/YYYY'
) AS "Due Date",
(fn_get_busniess_days (TRUNC (req.validity_start_date))
) AS "Days<br>Left",
req.pa_mode_type_lkpcd AS "Source",
TO_CHAR (TRUNC (wmdtl.rtng_date),
'MM/dd/yyyy'
) AS "Assigned On",
NVL (wmdtl.assigned_to_user_name,
'Not Assigned'
) AS "Assigned To",
req.org_unit_sid AS "OrgUnitSid",
TO_CHAR
(wmdtl.modified_date,
'MM/dd/yyyy hh24:mi:ss'
) AS "WTRD_MODIFIED_DATE",
TO_CHAR (wmdtl.rtng_date,
'MM/dd/yyyy'
) AS "WTRD_RTNG_DATE",
req.status_cid AS "PA_STATUS_CID",
TO_CHAR (req.modified_date,
'MM/dd/yyyy'
) AS "PA_REQ_MODIFIED_DATE",
prs.state_pa_srvc_type_code
AS "STATE_PA_SRVC_TYPE_CODE",
wmdtl.wm_pa_task_rtng_dtl_sid
AS "WM_TASK_RTNG_DTL_SID",
wmdtl.assigned_to_user_acct_sid
AS "WTRD_Assigned_to_user_acct_sid",
(fn_get_busniess_days (TRUNC (req.validity_start_date))
) AS "Days<br>LeftSort",
wmdtl.assigned_to_org_unit_sid
AS "WTRD_Assigned_to_OrgUntSid",
DECODE
((SELECT COUNT (*)
FROM pa_request_status prs
WHERE prs.pa_rqst_sid = req.pa_rqst_sid
AND prs.status_cid = 5
AND prs.oprtnl_flag = 'I'),
0, 'N',
'Y'
) AS "SHOW_UTILIZATION"
FROM pa_request req,
pa_certification_identifier pci,
status sts,
pa_request_x_member prxm,
wm_pa_task_routing_detail wmdtl,
pa_service_date psd,
org_unit ou,
pa_request_service prs,
pa_request_x_provider_location prxpl,
provider_location pl,
provider_detail pd,
provider p,
mbr_dmgrphc md
WHERE req.oprtnl_flag = 'A'
AND req.status_cid NOT IN
(20, 30, 70, 25, 80, 96, 85, 5, 97, 98, 101)
AND req.org_unit_sid IN
(3057, 3142, 3058, 3143, 3059, 3144, 3060, 3145,
3061, 3146, 3062, 3147, 3063, 3148, 3064, 3149,
3065, 3150, 3066, 3151, 3067, 3152, 3068, 3153,
3069, 3154, 3070, 3155, 3071, 3156, 3072, 3157,
3073, 3158, 3074, 3159, 3075, 3160, 3076, 3161,
3077, 3162, 3078, 3163, 3079, 3164, 3080, 3165,
3081, 3166, 3082, 3167, 3083, 3168, 3084, 3169,
3085, 3170, 3086, 3171, 3087, 3172, 3088, 3173,
3089, 3174, 3090, 3175, 3091, 3176, 3092, 3177,
3093, 3178, 3094, 3179, 3095, 3180, 3096, 3181,
3097, 3182, 3098, 3183, 3099, 3184, 3100, 3185,
3101, 3186, 3102, 3187, 3103, 3003, 75000104,
75000108, 2006, 75000103, 75000102, 75000113,
75000111, 75000109, 2001, 2009, 75000105,
75000107, 2004, 2010, 2013, 2014, 2005, 2011,
75000112, 2002, 1001, 2012, 75000106, 2007,
75000101, 2003, 75000110, 2008, 3001, 3002, 3019,
3104, 3020, 3105, 3021, 3106, 3022, 3107, 3023,
3108, 3024, 3109, 3025, 3110, 3026, 3111, 3027,
3112, 3028, 3113, 3029, 3114, 3030, 3115, 3031,
3116, 3032, 3117, 3033, 3118, 3034, 3119, 3035,
3120, 3036, 3121, 3037, 3122, 3038, 3123, 3039,
3124, 3040, 3125, 3041, 3126, 3042, 3127, 3043,
3128, 3044, 3129, 3045, 3130, 3046, 3131, 3047,
3132, 3048, 3133, 3049, 3134, 3050, 3135, 3051,
3136, 3052, 3137, 3053, 3138, 3054, 3139, 3055,
3140, 3056, 3141)
AND req.pa_rqst_sid = prs.pa_rqst_sid
AND prs.oprtnl_flag = 'A'
AND prs.pa_rqst_srvc_sid = psd.pa_rqst_srvc_sid
AND psd.oprtnl_flag = 'A'
AND req.pa_rqst_sid = pci.pa_rqst_sid
AND pci.oprtnl_flag = 'A'
AND req.pa_rqst_sid = prxm.pa_rqst_sid
AND prxm.oprtnl_flag = 'A'
AND md.oprtnl_flag = 'A'
AND md.status_cid = 2
AND TRUNC (SYSDATE) BETWEEN md.from_date AND md.TO_DATE
AND prxm.mbr_sid = md.mbr_sid
AND ou.org_unit_sid = req.org_unit_sid
AND ou.oprtnl_flag = 'A'
AND req.pa_rqst_sid = prxpl.pa_rqst_sid
AND prxm.pa_rqst_sid = prxpl.pa_rqst_sid
AND pci.pa_rqst_sid = prxm.pa_rqst_sid
AND pci.pa_rqst_sid = wmdtl.subsystem_task_sid
AND pci.pa_rqst_sid = prxpl.pa_rqst_sid
AND prxpl.pa_prvdr_type_lkpcd = 'RR'
AND prxpl.oprtnl_flag = 'A'
AND req.status_cid = sts.status_cid
AND sts.status_type_cid = 3
AND sts.oprtnl_flag = 'A'
AND prxpl.prvdr_lctn_iid = pl.prvdr_lctn_iid
AND p.prvdr_sid = pd.prvdr_sid
AND p.prvdr_sid = pl.prvdr_sid
AND pd.oprtnl_flag = 'A'
AND pd.status_cid = 2
AND TRUNC (SYSDATE) BETWEEN pd.from_date AND pd.TO_DATE
AND wmdtl.subsystem_task_sid = req.pa_rqst_sid
AND wmdtl.subsystem_lkpcd = 'PA'
AND wmdtl.oprtnl_flag = 'A'
AND req.pa_rqst_date > (SYSDATE - 365)
ORDER BY TO_DATE ("Request Date", 'MM/dd/yyyy hh24:mi:ss') DESC,
"Beneficiary Name" ASC) a
WHERE ROWNUM < 102;regards,
P Prakash
Edited by: BluShadow on 17-May-2011 15:01
added {noformat}{noformat} tags around the code833560 wrote:
Can any one give me clue ,how to find out which sub query returns more than one row in the following query .This is why smaller, simpler queries are easier to work with than huge ones - when something like this goes wrong smaller queries are much eaiser to debug. Unfortunately using smaller, easier-to-work with queries is not always an option
Ganesh is right - you will have to dissect the big query bit by bit until you find the offending subquery. If there is another way I would like to find out about it too.
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date_type_code char(1) null,
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holiday_flag char(1) null,
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it should use the d_date_dy index correct?
Here is what the query looks like:
INSERT INTO F_ENGINE (YEAR_KEY,MONTH_KEY,WEEK_IN_YEAR_KEY,DAY_IN_YEAR_KEY,DAY_IN_MONTH_KEY,HOUR_IN_DAY_KEY, Q_HOUR_IN_DAY_KEY,
GRID_KEY,ENGINE_KEY,TIME_STAMP,ENGINE_CPU_UTIL,ENGINE_CPU_GRID_UTIL,MEMORY_TOTAL_BYTE, MEMORY_FREE_BYTE,DISK_FREE_MEGABYTE,
PROCESS_COUNT,ENGINE_ID,GRID_ID,GRID_NAME,BATCH_ID,RECORD_VIEWABLE_F)
SELECT EXTRACT(YEAR FROM START_DATETIME),EXTRACT(MONTH FROM START_DATETIME), DD.WEEK_ID,
TO_NUMBER(TO_CHAR(START_DATETIME, 'DDD')), EXTRACT(DAY FROM START_DATETIME),EXTRACT(HOUR FROM START_DATETIME),
FLOOR(EXTRACT(MINUTE FROM START_DATETIME)/15)*15,DG.GRID_KEY,DE.ENGINE_KEY, START_DATETIME,CPU_UTIL,DS_CPU,MEMORY,
FREE_MEMORY,FREE_DISK,PROCESSES,ID,PE.GRID,DG.GRID_NAME,:B1 ,1
FROM P_ENGINE PE, D_GRID DG, D_ENGINE DE, D_DATE DD
WHERE PE.GRID = DG.GRID_ID AND DG.CURRENT_FLAG = 'Y' AND PE.ID = DE.ENGINE_ID AND DE.GRID_KEY = DG.GRID_KEY AND
DE.CURRENT_FLAG = 'Y' AND PE.BATCH_ID = :B1 AND DD.YEAR_ID = EXTRACT(YEAR FROM START_DATETIME) AND
DD.DAY_IN_YEAR = TO_NUMBER(TO_CHAR(START_DATETIME,'DDD'))
ORDER BY EXTRACT(YEAR FROM START_DATETIME),EXTRACT(MONTH FROM START_DATETIME),
EXTRACT(DAY FROM START_DATETIME),EXTRACT(HOUR FROM START_DATETIME),FLOOR(EXTRACT(MINUTE FROM START_DATETIME)/15)*15,
DG.GRID_KEY,DE.ENGINE_KEY
Here is the explain plan:
Operation Object Object Type Order Rows Size (KB) Cost Time (sec) CPU Cost I/O Cost
INSERT STATEMENT
SORT ORDER BY
HASH JOIN
HASH JOIN
HASH JOIN
TABLE ACCESS FULL D_GRID TABLE 1 2 0.316 3 1 36887 3
TABLE ACCESS FULL D_ENGINE TABLE 2 10 0.410 3 1 42607 3
PARTITION LIST SINGLE 5 1434 344.496 9 1 2176890 9
TABLE ACCESS FULL P_ENGINE TABLE 4 1434 344.496 9 1 2176890 9
TABLE ACCESS FULL D_DATE TABLE 7 7445 283.550 19 1 3274515 18Now it is obviously not using the index for the d_date table since it is doing a full table access.
Does this have something to do with the fact that I am using extract(), to_number(), to_char() functions in my WHERE clause that it is not allowing the use of the index?
Any help would be greatly appreciated. Thanks.
-TimIt's difficult to tell just from this. For one thing, you didn't post your query using the forum format tags, so it's hard to read and you didn't post your Oracle version.
In the query, you don't always prefix columns with the table alias. That makes it impossible for us (and maintainers of this code) to know at a glance which table a column is in.
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Help with exporting to WHCC using Lightroom
Please help! My brother (professional photographer) is on a 6 month kayak trip and I've been left in charge of 20 years of photography! I have detailed instructions on how to export photographs from the external hard drives, to an online company wh
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Quick launch links to documents, can only save the document once
Hi, We have a problem in SharePoint 2007. We have some links to documents in the quick launch menu. First, these were opened as read-only per default. This was fixed by adding file:// instead of the http:// Now we can save the document/excel/... once
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Hi, I'm currently converting a forms 6.0 application to forms 10g. My application has the file upload and download functionality. I researched the webutil 9i beta version, but my infrastructure team would not allow this to be installed in the 10g app
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HP 5510 all in one reads "print cartridge error"
Printer will not reset after I installed new HP black cartridge. I cleaned cartidges and printer heads as per HP instructions, but same error message remains. Is there a way to reset the printer?
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Getting the following error message while login to OFA Analyst
Hi I am getting the following error message while connecting to a OFA Analyst database and then I am not able to see any of the reports in OFA Analyst. (MXXEQ35) RE.IWYD_Z70945 is not a valid RE.ENTRY I think one of the report entry is corrupted in c