New Partition number creates Performance.

Hello

Let me give you my current scenario.

My Txn table is huge and used very often. That's why it was designed earlier as ITO with partition range on quarterly basis. so 3 months of data will reside in each partition and we MAXVALUe as HIGH score, has daily transaction data you won't receive data at a later date

We have also a statistics program runs every day to update the statistics in this table txn.

So for the abstracts

*. TXN table is IOT
*. All indexes are local index
*. Quarterly Partition by range.
*. Statistics updated daily.

So my request on this table can work any given input less than a second...


During the 2nd quarter, we added new tablespace, partition and index modified to include the new partition. (say its created by end of March). so, when comes on April 1 and the data is loaded to this partition (only on folders arounf 20)... my query took a lot of time... Infact he started to hung... When checked in OEM (Oracle enterprise manager). It seems that Oracle has created the 2-3 query plan and started using the BAD query plan...

Therefore, the CPU usage was very high... and same query take ages to return the result.

When we asked DBA to check on this... they did something and he began, works fine... When I checked the OEM my query did not use the BAD query plan... He used the different one.

time spent...

Same problem happened when we tried to add the partition for Q3.

I really don't understand... Add partition must causes the performance issue. So I analyze the table after you create the partition or rebuilt the index? how it works?


Concerning
Balaji Tr.

We used to have a similar problem. We have monthly partitions and we had performance problems on the 1st that some queries have access to the new (empty) partition and some queries whre checking data to yesterday (full score).

Problem of the classical art. Had time by copying his stats before we used the new partition.

David Marcos.

Tags: Database

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