Re: FW: Error related to hash memory
Date: Fri, 3 Dec 2021 14:53:36 +0000
Message-ID: <CAGtsp8kDnTx6X09fKLfOtm=ys5+WE0hkmAy1PT4u4DBtD5JX9Q_at_mail.gmail.com>
Comments inline.
Regards
Jonathan Lewis
>>> As you said exactly there are many decodes/cases in the query and
scalar subqueries just before 'group by' applies. There is a
function(Pkg1.Fun1) used which is not parallel enabled. Also parallel hints
used in the Select part of the query. And this query does insert+append
into a global temporary table. Also in the FROM clause all are global
temporary tables except TFA, TFMA and TSLV.
>
> >>> In regards to having scalar subqueries operated after group by , would
> that not make the results different?
>
In some cases yes, in others no. The example I linked to doesn't highlight the threat you're thinking of since it doesn't AGGREGATE by department id before joining to get the department name; but if there had been an original "aggregate by department name" and I had aggregated by department ID and then joined to get the department name the result would have been different if two departments had had the same name. So there is a uniqueness requirement that you have to think about (8 times) in your case.You may find that none of your scalar subqueries can be moved in the same way. Another variation on the theme (which, again, may not be appropriate because it changes the result) is to see if you can aggregate any of the three tables on their join columns (in a no_merge view) before doing the join. (Oracle can do this automatically in later versions, but not - I think - in 11.g).
> >>> I am still trying to understand how to find the exact opt_estimate
> hints with a proper query block to make the optimizer estimate ~168million
> before "hash group by".
>
I've added a /*+ cardinality() */ hint to the start of your code that I think is in the correct place. It's easier that remembering the syntax for the opt_estimate()
>>> And by setting the "event 32699" will that make the error disappear OR
> is it for debugging to find out the reason around the Ora- 32690?
>
This is simply to dump a trace file, not to work around the problem.
> INSERT /*+ APPEND */
> INTO GTT_TABLE (.....)
> SELECT ......, SUM (crt), SUM (art), SUM (iamt), SUM
> (amt),...... ~46 different columns
> FROM (SELECT /*+ cardinality(168000000) */ ....33 columns,
>>
>>
Regards
Jonathan Lewis
On Fri, 3 Dec 2021 at 13:53, Lok P <loknath.73_at_gmail.com> wrote:
> Thank You So Much Jonathan and Mark.
> As you said exactly there are many decodes/cases in the query and
> scalar subqueries just before 'group by' applies. There is a
> function(Pkg1.Fun1) used which is not parallel enabled. Also parallel hints
> used in the Select part of the query. And this query does insert+append
> into a global temporary table. Also in the FROM clause all are global
> temporary tables except TFA, TFMA and TSLV.
>
> It's a big Insert query and I tried to not put all the individual columns
> but just key functions(like decode, case etc). It groups ~46 columns in
> that 'hash group by' but before that it fetches+transforms, ~55+ columns
> data. I will try to make that function parallel enabled + enable parallel
> DML for the query and then hopefully that "hash group by" can be operated
> in parallel.
>
> Apology if these are silly questions,
> In regards to having scalar subqueries operated after group by , would
> that not make the results different?
> I am still trying to understand how to find the exact opt_estimate hints
> with a proper query block to make the optimizer estimate ~168million before
> "hash group by". And by setting the "event 32699" will that make the error
> disappear OR is it for debugging to find out the reason around the Ora-
> 32690?
>
>
> INSERT /*+ APPEND */
> INTO GTT_TABLE (.....)
> SELECT ......, SUM (crt), SUM (art), SUM (iamt), SUM
> (amt),...... ~46 different columns
> FROM (SELECT ....33 columns,
> DECODE ( Amt1, 1, (SELECT Pkg1.Fun1 (...) FROM
> DUAL), NULL),
> ..13 columns..,
> (SELECT DECODE (SUBSTR (Col_data,1,INSTR (Col_data,
> '*',1, 1)- 1),'XX', SUBSTR (Col_data,INSTR (Col_data,'*',1, 1)+ 1,( INSTR
> (Col_data,'*',1,2)- INSTR (Col_data,'*', 1,1))- 1))FROM DUAL)/ 100 Amt,
> (SELECT DECODE (MPCD,'YY', SUBSTR (Col_data,INSTR
> (Col_data, '*',1, 2) + 1,( INSTR (Col_data,'*',1, 3)- INSTR (Col_data,
> '*',1,2))- 1)) FROM DUAL) aty,,
> (SELECT DECODE (MPCD, 'YY', SUBSTR (Col_data, INSTR
> (Col_data, '*', 1,3) + 1, ( INSTR (Col_data,'*', 1, 4)- INSTR (Col_data,
> '*', 1, 3))- 1)) FROM DUAL) vnm,
> (SELECT DECODE (SUBSTR (Col_data, 1, INSTR
> (Col_data, '*', 1, 1) - 1), 'M1', SUBSTR (Col_data, INSTR (Col_data, '*',
> 1, 4)+ 1,( INSTR (Col_data, '*',1,5)- INSTR (Col_data, '*', 1, 4)) - 1),
> NULL) FROM DUAL) INM,
> (SELECT DECODE (MCID,9999, MDID, 9999, MDID, DECODE
> (SUBSTR (Col_data, 1, INSTR (Col_data,'*', 1,1) - 1),'M1', SUBSTR
> (Col_data,INSTR (Col_data, '*',1,2) + 1, ( INSTR (Col_data, '*',1,3) -
> INSTR (Col_data, '*', 1,2))-1))) FROM DUAL)
> FROM (SELECT /*+ parallel(TTTD,4) leading(TTSFA TTTD)*/
> DECODE (TTFE.C1, 'BBB', TTFE.CRT, NULL)
> .......9 columns..
> DECODE (TFMA.MACD, 'XX', TFMA.text1, 'XX',
> TFMA.text2, NULL) RDFI,
> ... 18 columns..,
> DECODE (TFMA.MACD, 'XX', TFMA.text1, NULL)
> cbcd,
> CASE
> WHEN INSTR ( :B7, PTCD) = 0 THEN
> TTSFA.ILVL
> ELSE
> CASE
> WHEN (SELECT PSS FROM tmfs FS
> WHERE FS.ptsid = TTFE.fsid) = 'N'
> THEN CASE
> WHEN (SELECT FEE.PSS FROM FEE
> FEE WHERE FEE.ptsid = TTFE.fsid AND FEE.PTMCD = TTTD.MPCD) =
> 'Y'
> THEN TTSFA.ILVL
> ELSE
> CASE
> WHEN INSTR ( :B6, PTCD) >
> 0
> THEN DECODE
> (TTTD.MPCD,'XX', 'XX', 'XX', 'XXX','XX', 'XX','XX', 'XX', NULL)
> WHEN INSTR ( :B5, PTCD) >
> 0
> THEN DECODE (TTTD.MPCD,
> 'XX', 'XX', TTSFA.ILVL)
> END
> END
> ELSE
> CASE
> WHEN (SELECT PSS FROM tmfs FS
> WHERE FS.ptsid = TTFE.fsid) = 'Y'
> THEN CASE
> WHEN (SELECT FEE.PSS
> FROM FEE FEE WHERE FEE.ptsid =TTFE.fsid AND FEE.PTMCD = TTTD.MPCD)
> ='N'
> THEN CASE
> WHEN INSTR
> (:B6,PTCD) > 0
> THEN DECODE
> (TTTD.MPCD, 'XX', 'XX','VI', 'XX', 'XX', 'XX', 'XX', 'XX', NULL)
> WHEN INSTR (
> :B5,PTCD) >0
> THEN DECODE
> (TTTD.MPCD, 'XX', 'XX', TTSFA.ILVL)
> END
> ELSE
> TTSFA.ILVL
> END
> END
> END
> END
> ILVL,
> DECODE (TTFE.C1, 'XX', TTFE.CRT, 'XX',
> TTFE.CRT, 0) CRT,
> DECODE (TTFE.C1, 'XX', TTFE.ARATE, 'XX',
> TTFE.amrt, 0) ARATE,
> CASE
> WHEN TTFE.C1 = 'XX' OR TTFE.C1 = 'XX'
> THEN ROUND ( TTFE.CRT+ ( NVL
> (TTTD.samt, TTTD.TAMT) * TTFE.amrt), 2) * -1
> ELSE 0
> END
> IN_AMT,
> CASE
> WHEN (SELECT COUNT (*) FROM TLSV WHERE
> LNM = :B9 AND DESCR = :B8 AND LV = TTFE.C1) >0 AND TTFE.TAMT <> 0
> THEN TTFE.AMT * ( NVL (TTTD.samt,
> TTTD.TAMT)/ TTFE.TAMT)
> ELSE 0
> END
> as_amt,
> CASE
> WHEN TLSV.LV IS NOT NULL
> THEN (TTFE.AMT / TTFE.FCNT)
> END
> DAMT,
> TFA.D_CHG / 100 D_CHG,
> TFPA.PCD|| '*'| TRIM (TFPA.text1)|| '*'||
> TFPA.TEXT3|| '*'|| TFPA.TEXT4|| '*'|| TFPA.TEXT5|| '*' Col_data,
> DECODE (TTSFA.CT_AMT, 0, NULL, NULL, NULL,
> 1) CO_AMT,
> DECODE (MACD, 'XX', TFMA.text2, NULL) S_CD,
> DECODE (MACD, 'XX', TFMA.TEXT5, NULL) ,
> DECODE (MACD, 'XX', TFMA.TEXT6, NULL) BC,
> DECODE (MACD, 'XX', TFMA.TEXT8, NULL)
> MID,
> DECODE (MACD, 'XX', TFMA.TEXT7, NULL) MTYP,
> DECODE ( MACD, 'XX', TO_CHAR ( TO_DATE (TRIM
> (TFMA.TEXT9),'yyyymmdd'), 'mm/dd/yyyy'), NULL) S_DT,
> DECODE (TFMA.text1, NULL, 'N', 'Y') ,
> TTTD.DT_MTHD
> FROM TTSFA , TTTD , TFA , TFMA, TTFE,
> (SELECT .. ~7 columns.. FROM TFA WHERE PCD
> IN ('XX', 'XX')) TFPA,
> (SELECT LV FROM TLSV WHERE LNM =
> 'XXXX' AND DESCR = 'XXXXXXXXX') TLSV
> WHERE TTSFA.did = TTTD.did AND TFPA.SDT(+) =
> TTTD.SDT AND TFPA.TDID(+) = TTTD.TDID
> AND TLSV.LV(+) = TTFE.C1 AND TTSFA.FDT =
> TTTD.SDT AND TTSFA.OSID = TTTD.SID AND TTTD.TDID = TFA.TDID(+)
> AND TTTD.SDT = TFA.SDT(+) AND TFA.UBD(+) =
> :B4 AND TTTD.TDID = TFMA.TDID(+) AND TTTD.SDT = TFMA.SDT(+)
> AND TFMA.MACD(+) = DECODE (TTTD.MPCD, 'XX',
> :B3, :B2) AND TTTD.DEP_IND = :B1
> AND TTSFA.did = TTTD.did AND TTSFA.SMID =
> TTTD.SMID AND TTFE.EID = TTSFA.did AND TTFE.IDT = TTSFA.SDT
> AND TTFE.SID = TTSFA.SID AND TTFE.OTYP =
> 'TTFE' AND TTFE.OID = TTTD.SMID AND TTFE.BST = 'XX'
> AND ( ( PTCD = 'XX' AND TTFE.fsid IS NOT
> NULL)
> OR (PTCD <> 'XX'))
> AND ( ( PTCD = 'XX' AND TTFE.fsid IS NOT
> NULL)
> OR (PTCD <> 'XX'))
> AND ( ( PTCD = 'XX' AND TTFE.fsid IS NOT
> NULL)
> OR (PTCD <> 'XX')) AND ( ( PTCD = 'XX'
> AND TTFE.fsid IS NOT NULL)
> OR (PTCD <> 'XX'))
> AND ( ( PTCD = 'XX' AND TTFE.fsid IS NOT
> NULL)
> OR (PTCD <> 'XX'))
> AND ( ( PTCD = 'XX' AND TTFE.fsid IS NOT
> NULL)
> OR (PTCD <> 'XX'))))
> GROUP BY .... ~46 columns
>
>
>
> On Thu, Dec 2, 2021 at 11:17 PM Mark W. Farnham <mwf_at_rsiz.com> wrote:
>
>> all the stuff JL mentioned, plus a little bit that didn’t make it to
>> oracle-l before, probably because my remember to snip circuit is failing:
>>
>>
>>
>> Things I would try:
>>
>>
>>
>> 1) force parallel local for the query
>>
>> 2) if 1) alone fails, do 1) and on the instance of choice run a scan
>> of a non-indexed column of key tables of the query SIMPLY on the instance
>> of choice
>>
>> 3) if 1-2) fails, try a prelude of enumerating the disjoint partition
>> enumerators from “43 | PARTITION RANGE ITERATOR “ and generate
>> the union all query of the separate partitions individually, thus making
>> each hash memory set requirement smaller, doing these serially, rather than
>> in parallel (which might not be possible in 11 anyway) because your problem
>> is memory, not elapsed time. IF a single one of your partitions is nearly
>> everything, it still will probably go splat, but if they are relatively
>> flat each one being significantly smaller might avoid the error. IF
>> figuring out the enumerated list of partition predicates is fast, this also
>> has a **chance** to make everything faster, especially if the CBO finds
>> a better plan for a single partition at a time but also because each hash
>> area creation and probe might be a fraction of the current single one. IF
>> you have time to experiment, this **might** be a consistent winner on
>> both speed and footprint, but your mileage may vary.
>>
>> 4) forcing a sort group by **might** also work and would be easier
>> for most folks to code up.
>>
>>
>>
>>
>>
>>
>>
>> *From:* Mark W. Farnham [mailto:mwf_at_rsiz.com]
>> *Sent:* Thursday, December 02, 2021 10:04 AM
>> *To:* 'loknath.73_at_gmail.com'; 'Pap'
>> *Cc:* 'Oracle L'
>> *Subject:* RE: Error related to hash memory
>>
>>
>>
>> Things I would try:
>>
>> <snip>
>>
>>
-- http://www.freelists.org/webpage/oracle-lReceived on Fri Dec 03 2021 - 15:53:36 CET