Fastest way to access a partition with which has no indexes and has 74 mill
hi ,
with 73 million data i am scared to even query the partition.Can u suggest me some ways to access the data in the minimum possible time.there are no indexes at present.
this is the query i want to run
SELECT RECONID,SOURCE,TXN_TYP,TRANSACTIONDATE,SFN_FILTER_TO_NUMBER(CARDNUMBER) CARDNUMBER,LPAD(TRIM(TRACENUMBER),4,0) TRACENUMBER,
TERMINALID,DBCR_FLG,TRAN_AMOUNT,BUSINESSDATE,TO_ACCOUNTNUMBER,RECON_TYPE FROM APP_1 PARTITION (PART_1)
WHERE BUSINESSDATE BETWEEN '06-JAN-2012' AND '08-JAN-2012' AND SOURCE = 'BRN'
AND DBCR_FLG IN ('D','C') AND TXN_TYP='T1';
AT PRESENT THERE ARE NO INDEXES ON THE PARTITION.
Hi
user8731258 wrote:
i queried the dba_tables and the average row length is 696 bytes.
this means 696*73 million bytes. so this is equal to APPROX 51 GB (700*73 MILLION) / (10 TO THE POWER 9)actually, there's a more direct way to find the amount of data to be returned:
SELECT bytes
FROM DBA_SEGMENTS
WHERE SEGMENT_NAME = :your_segment_name
AND PARTITION_NAME = :partition_name
now what do u suggest?There's not much that can be suggested here. Do the full table scan of that partition, wait however long it takes to return results. Use parallelism to make your query faster, if you have enough spare CPU on your database.
And learn from this experience to avoid such situations in the future: you should've indexed that table long before it got tens or even hundreds (that's just one partition that's 50Gb big, right?) of gigabytes of data.
Best regards,
Nikolay
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