Performance with Burn Factor
Hi I wondering if anyone knwos about the downside of change the server wide burn factor figure, I am aware there used to be a performanc ehit a long time ago , but soes this still persist in 12.5 version and above, and how serious can the performance hit be? Thanks for any advice David
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David
11/3/2010 10:14:21 AM
sybase.ase.performance+tuning
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On Wed, 03 Nov 2010 02:14:21 -0800, David wrote: > Hi I wondering if anyone knwos about the downside of change > the server wide burn factor figure, I am aware there used to > be a performanc ehit a long time ago , but soes this still > persist in 12.5 version and above, and how serious can the > performance hit be? I presume you mean that "burn factor" that refers to identity values. If so, then the performance hit of reducing this value depends on how many new values are generated per table per unit of time. The issue is that the top of the pre-allocated identity values is stored on the OAM page of the table. Each time a new batch of values needs to be pre-allocated the OAM page needs to be written. If you generate 10s of thousands of inserts per minute then having a large burn factor will reduce the number of times the OAM page needs to be re-written. But if your tables only see moderate insert activity then having a small value will not really have any performance effect. Note that I tend to use the "identity_gap" attribute at the table level to set this value on a table by table basis. Michael
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Michael
11/3/2010 6:29:17 PM
Thank you for your clear responce. is there no performance impact by changing the identity_gap attribute at table level? > On Wed, 03 Nov 2010 02:14:21 -0800, David wrote: > > > Hi I wondering if anyone knwos about the downside of > > change the server wide burn factor figure, I am aware > > there used to be a performanc ehit a long time ago , but > > soes this still persist in 12.5 version and above, and > > how serious can the performance hit be? > > I presume you mean that "burn factor" that refers to > identity values. > > If so, then the performance hit of reducing this value > depends on how many new values are generated per table per > unit of time. The issue is that the top of the > pre-allocated identity values is stored on the OAM page of > the table. Each time a new batch of values needs to be > pre-allocated the OAM page needs to be written. If you > generate 10s of thousands of inserts per minute then > having a large burn factor will reduce the number of times > the OAM page needs to be re-written. But if your tables > only see moderate insert activity then having a small > value will not really have any performance effect. > > Note that I tend to use the "identity_gap" attribute at > the table level to set this value on a table by table > basis. > > Michael >
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David
11/4/2010 10:38:12 AM
There is a performance impact if you use identity_gap. The source is the same - every time a new burn set has to be generated, ASE has to write the new value to disk. The performance impact using identity_gap is usually greater than the burning set factor as identity_gap is usually used to make the burning sets smaller than they would be using the burning set factor (even when set to 1, the burning set factor usually results in large burning sets - the exact size depending on the datatype used for the column). -bret On 11/4/2010 4:38 AM, David wrote: > Thank you for your clear responce. > is there no performance impact by changing the identity_gap > attribute at table level? >> > On Wed, 03 Nov 2010 02:14:21 -0800, David wrote: >> >>> Hi I wondering if anyone knwos about the downside of >>> change the server wide burn factor figure, I am aware >>> there used to be a performanc ehit a long time ago , but >>> soes this still persist in 12.5 version and above, and >>> how serious can the performance hit be? >> >> I presume you mean that "burn factor" that refers to >> identity values. >> >> If so, then the performance hit of reducing this value >> depends on how many new values are generated per table per >> unit of time. The issue is that the top of the >> pre-allocated identity values is stored on the OAM page of >> the table. Each time a new batch of values needs to be >> pre-allocated the OAM page needs to be written. If you >> generate 10s of thousands of inserts per minute then >> having a large burn factor will reduce the number of times >> the OAM page needs to be re-written. But if your tables >> only see moderate insert activity then having a small >> value will not really have any performance effect. >> >> Note that I tend to use the "identity_gap" attribute at >> the table level to set this value on a table by table >> basis. >> >> Michael >>
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Bret
11/4/2010 3:14:39 PM
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