Cannot set sga_target with db_block_buffers set

Hello Oracle Community!
I'm trying to set a sga_target on my Oracle 10g R2 database but it shows me the following message: Cannot set sga_target with db_block_buffers set
What exactly's the impact on disabling db_block_buffers parameter? Is it better to do while the database's not being used?
Thank you very much!

K- wrote:
@Aman
This database uses SPFILE, how do I proceed to erase the db_block_buffer on it? The only way's using the CREATE PFILE FROM SPFILE command? Do I have to shutdown my production database if I execute it?
ThanksYes, this is a major change, you will have to bounce. Probably the way to go would be to create pfile from spfile, copy that away somewhere safe, edit the pfile, shutdown and startup with the pfile. If you've made a mistake at this point where it won't come up, you can startup without the pfile if you need to, or keep trying to fix the pfile. When you are up, check that the parameters are what you think you did, then create spfile from pfile and bounce. Of course, if performance then goes wacko, you can go back to the saved pfile until you figure out what went wrong.
You can try with the sizing you are currently using, then after running for a while use the advisors to tweak. Note that with sga_max_size it can vary by platform and configuration whether you use the difference between target and max, so platform determines whether you should make them the same (see the thread sga_max_size vs sga_target ) . If they should be the same, you'll have to bounce later when you tweak. Get familiar with the HIST views that record the self-tuning changes as they happen.

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Hi,
in 10g R2 should I stop/start database when I change sGA_TARGET :
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Thank you.

user522961 wrote:
OK.
When I query V$PARAMETER I have the OLD value for SGA_TARGET. It is normal because the value in V$PARAMETER comes from starting and spfile. How can I be sur that now oRACLE uses the new value for SGA_TARGET effectively ?
Thanks again.Not sure I understand your question. If you set SGA_TARGET with SCOPE=MEMORY or BOTH, it should be in effect immediately.
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sga_target                           big integer 256M
SQL> alter system set sga_target=257M scope=both;
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BYTES              MB
272629760         260
SQL> show parameter sga
NAME                                 TYPE        VALUE
lock_sga                             boolean     FALSE
pre_page_sga                         boolean     FALSE
sga_max_size                         big integer 512M
sga_target                           big integer 260M
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Suresh Bansal wrote:
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