Re: [EXTERNAL] Re: rman backup slow even after patching it

Jeffrey - What is your target? Tape/Disk/Cloud? Are you using any type of third-party software or is it straight-up RMAN?

On Tue, Aug 23, 2022 at 6:42 AM Beckstrom, Jeffrey <jbeckstrom_at_gcrta.org> wrote:

> 50 to 100% slower
>
>
>
> *From:* niall.litchfield_at_gmail.com <niall.litchfield_at_gmail.com>
> *Sent:* Monday, August 22, 2022 11:28 AM
> *To:* Beckstrom, Jeffrey <jbeckstrom_at_gcrta.org>
> *Cc:* oracle-l_at_freelists.org
> *Subject:* [EXTERNAL] Re: rman backup slow even after patching it
>
>
>
> What does "slow" mean in this context?
>
>
>
> On Mon, Aug 15, 2022 at 6:37 PM Beckstrom, Jeffrey <jbeckstrom_at_gcrta.org>
> wrote:
>
> In 19.14, rman backup significantly slower than in 11g. This morning I put
> on some RMAN patches to no effect. In the rman trace file from a running
> backup I see:
>
>
>
> Adjusting buffer count to honor available PGA; old bufcnt: 4, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 892876434,
> pga_available: 0
>
> Adjusting buffer count to honor available PGA; old bufcnt: 4, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 892876434,
> pga_available: 0
>
> Adjusting buffer count to honor available PGA; old bufcnt: 5, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 892876434,
> pga_available: 0
>
> Adjusting buffer count to honor available PGA; old bufcnt: 6, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 892876434,
> pga_available: 0
>
> Adjusting buffer count to honor available PGA; old bufcnt: 4, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 892876434,
> pga_available: 0
>
> Adjusting buffer count to honor available PGA; old bufcnt: 5, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 892876434,
> pga_available: 0
>
> Adjusting buffer count to honor available PGA; old bufcnt: 8, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 892876434,
> pga_available: 0
>
> Adjusting buffer count to honor available PGA; old bufcnt: 16, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 892876434,
> pga_available: 0
>
> Backup envisage an unusual situation due to PGA memory availability: we
> are using only 2 read threads (instead of 9) for the current backup session
>
> Adjusting buffer count to honor available PGA; old bufcnt: 4, new bufcnt:
> 2, pga_agg_limit: 0, pga_agg_target: 0, pga_agg_used: 913692181,
> pga_available: 0
>
>
>
>
>
> Pga_aggregate targe is set at the cdb to a value. At the pdb level it is 0.
>
> Pga_aggregate_limit is not set anywhere.
>
>
>
> Do I need to set the pga_aggregate limit?
>
>
>
> Do I need to set both parameters at the PDB level?
>
>
>
> Jeffrey Beckstrom
>
> Greater Cleveland Regional Transit Authority
>
> 1240 W. 6th Street
>
> Cleveland, Ohio 44113
>
>
>
>
>
>
> --
>
> Niall Litchfield
> Oracle DBA
> http://www.orawin.info
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