Materialised view runs for ever ...
Hi
I'd appreciate if someone could shine some light on an issue I'm having with a materialised view.
I inherited this when I came into my current project, so before you ask me why tables are not partitioned or why a MV is being used for such a scenario, the answer is I don't know!!
Anyway ... I'm using "Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod" running on SUSE ...
There are a number of normalised tables two of which contain in the region of 400million rows each and tend to grow at the rate of 27000 rows per day.
There's a materialised view (for the purposes of providing fast interactive reporting) that is setup as a normal join between 4 tables; the above two and the other two are just basic dictionary type lookups each containing around 100 or so rows.
SELECT .... FROM LargeTable1, LargeTable2, Lookup3, Lookup4 WHERE Lookup3.ID=LargeTable1.LID and LargeTable2.ID=LargeTable1.ID and LargeTable2.LID=Lookup4.ID ;
Running a FULL refresh on the MV failes with a 'ora-01555 snapshot too old' error after about 5 days!! Then takes around the same amount of time to rollback. Can't do a FAST refresh, I think because logs and/or mv indecies are out of sync.
Table space is 63% full and undo space is set to auto-extend.
I've tried /*+RULE */ but that doesn't seem to make a huge difference.
Why does it take so long? Why does it fail? What can I do to speed it up?
Thanks in advance for your assistance.
Edited by: 883758 on Sep 7, 2011 2:16 PM
You should approach this as a SQL tuning exercise, without the ability to change the query itself.
Are table statistics up to date? Look at the execution plan – does it look reasonable for you? Are there any indexes that can help? (I am thinking covering indexes on the large tables …)
Iordan Iotzov
http://iiotzov.wordpress.com/
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8) Explain plan
OPERATION - OBJECT_NAME - OPTIONS - COST
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Edited by: G on May 17, 2011 9:07 AM
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If this answer was helpful, please mark as helpful answer. -
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>
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nvl(secchg.margin,0) as margin, nvl(secchg.FLOOR,0) as floor,
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AND assetype.int_y_n = 'Y'
AND security.rectype = 'L'
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nvl(intratechg.cap,security.cap) as cap,
nvl(intratechg.reset_freq,security.reset_freq) as reset_freq,
nvl(intratechg.cmpd_y_n,security.cmpd_y_n) as cmpd_y_n,
nvl(intratechg.cmpd_freq,security.cmpd_freq) as cmpd_freq,
nvl(intratechg.comp_type,security.comp_type),
nvl(intratechg.int_day,security.int_day),
intday.int_day_1, intday.int_day_2,
DECODE(intratechg.security, NULL, 'N', 'Y') AS int_dtls_yn
FROM v_schedules schedules, security, intday, intratechg, v_schedules intschdamt, security_cashflow
WHERE schedules.security = security.security
AND schedules.red_yn = 'Y'
AND security.int_day = intday.int_day
AND security.rectype = 'L'
AND intday.rectype = 'L'
AND intratechg.security (+)= schedules.security
AND intratechg.value_date(+)= schedules.schd_date
AND intratechg.rectype (+)= 'L'
AND intschdamt.security (+)= schedules.security
AND intschdamt.schd_date (+)= schedules.schd_date
AND intschdamt.red_yn (+)= 'N'
AND security_cashflow.inflow_type = 'INT'
AND security_cashflow.inflow_date = schedules.schd_date
AND security.security = security_cashflow.security
AND schedules.security = security_cashflow.security
UNION ALL
SELECT intratechg.security, 'IR' AS schg_type,
intratechg.value_date AS effective_date,
NVL(intratechg.rate,security.interest),
security.face_value,
NVL(intratechg.listing_int,security.listing_int),
NVL(intratechg.comm_prod_int,security.comm_prod_int),
NVL(intratechg.sec_create_int,security.sec_create_int),
nvl(intratechg.int_type,security.int_type),
nvl(intratechg.interest_key,security.interest_key),
nvl(intratechg.margin,security.margin),
nvl(intratechg.FLOOR,security.floor),
nvl(intratechg.cap,security.cap),
nvl(intratechg.reset_freq,security.reset_freq),
nvl(intratechg.cmpd_y_n,security.cmpd_y_n),
nvl(intratechg.cmpd_freq,security.cmpd_freq),
nvl(intratechg.comp_type,security.comp_type),
nvl(intratechg.int_day,security.int_day),
intday.int_day_1, intday.int_day_2, 'Y' AS int_dtls_yn
FROM intratechg, security, intday
WHERE intratechg.security = security.security
AND security.int_day = intday.int_day
AND intratechg.rectype = 'L'
AND security.rectype = 'L'
AND intday.rectype = 'L'
AND NOT EXISTS (SELECT 1 FROM v_schedules schedules
WHERE schedules.security = intratechg.security
AND schedules.schd_date = intratechg.value_date
AND schedules.red_yn = 'Y'))
ORDER BY security, srl_no
The code for the view V_schedules is;
CREATE OR REPLACE VIEW V_SCHEDULES AS
SELECT schdall.security,
schdall.schd_date,
schdall.schd_type,
schdall.percent,
schdall.units_o,
schdall.units_n,
schdall.amount,
schdall.sequences,
schdall.act_sch_dt,
schdall.security_n,
schdall.prior_act,
schdall.red_amount,
schdall.ben_refer,
schdall.round_method,
schdall.round_dec,
schdall.average_y_n,
schdall.schd_past_yn,
CASE WHEN schd_type IN(sysschd.red, sysschd.disred) THEN 'Y' ELSE 'N' END AS red_yn,
SUM( CASE WHEN schd_type IN(sysschd.red, sysschd.disred) THEN schdall.red_amount ELSE 0 END)
over(PARTITION BY schdall.security) AS tot_face_value,
SUM( CASE WHEN schd_type IN(sysschd.red, sysschd.disred) THEN schdall.red_amount ELSE 0 END)
over(PARTITION BY schdall.security
ORDER BY schdall.security, schdall.schd_date ASC) AS cum_face_value,
SUM( CASE WHEN schd_type IN(sysschd.red, sysschd.disred) THEN schdall.red_amount ELSE 0 END)
over(PARTITION BY schdall.security
ORDER BY schdall.security, schdall.schd_date DESC) AS to_be_redeemed ,
SUM(CASE WHEN schd_type =sysschd.INT THEN 0 ELSE 1 END)
over(PARTITION BY schdall.security,schdall.schd_date,schd_type)
AS no_of_schd
FROM
(SELECT schedules.security_o AS security,
schedules.schd_date,
schedules.schd_type,
schedules.percent,
schedules.units_o,
schedules.units_n,
schedules.amount,
schedules.sequences,
schedules.act_sch_dt,
schedules.security_n,
schedules.prior_act,
schedules.red_amount,
schedules.ben_refer,
schedules.round_method,
schedules.round_dec,
schedules.average_y_n,
DECODE(schedules.schd_type,'RED','Y','Y') AS schd_past_yn
FROM schdpast schedules
WHERE prior_act = 'A'
AND rectype = 'L'
UNION ALL
SELECT schedules.security_o AS security,
schedules.schd_date,
schedules.schd_type,
schedules.percent,
schedules.units_o,
schedules.units_n,
schedules.amount,
schedules.sequences,
schedules.act_sch_dt,
schedules.security_n,
schedules.prior_act,
schedules.red_amount,
schedules.ben_refer,
schedules.round_method,
schedules.round_dec,
schedules.average_y_n,
'N' AS schd_past_yn
FROM schedules
WHERE prior_act = 'A'
AND rectype = 'L'
AND Process_date IS NULL ) schdall,
(SELECT MAX(redschdtype) AS red,
MAX(disredtype) AS disred,
MAX(intschdtype) AS INT
FROM sysparamschd
WHERE rectype = 'L') sysschd
ORDER BY security, schd_date, schd_typeToo much SQL... makes me eyes hurt.
I think you're running down the wrong alley here. The very first and fundamental principle of performance tuning is identifying the performance problem. Saying that there is a problem is not identifying the actual problem.
You cannot run down the alley with a knife looking for a performance problem to kill if you do not know how it looks like. Good that you are running though - the old Klingon saying of "a running warrior can slit more throats" hold very true. :-)
Why is the existing SQL slow? You first need to identify that. Sure, a materialised view can make the end-query much faster as it has no longer to do all the work - that has now been done in batch by a DBMS_REFRESH job updating and maintaining that materialised view. But that work is still done... so have you actually fixed the cause of the performance problem, or merely hid it by addressing the symptoms?
How does one find and identify the underlaying performance problem with too-much-SQL-that-makes-Billy's-eyes-hurt? Software Engineering 101. Take any complex problem. Break it down into lots of smaller little problems. Solve each on in turn.
Take the SQL, break it down into simpler pieces and check each for performance issues. Look at the execution plan and cost. Determime if you (via the physical db design) are providing optimal I/O paths to the CBO in order for it to get to the required data with as little I/O as possible.
Once you deal with the facts, you can make an informed decision or whether or not a materialised view will actually fix the cause of the performance problem.
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