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@xxxxxxxxx>
wrote:
50 to 100% slower
*From:* niall.litchfield@xxxxxxxxx <niall.litchfield@xxxxxxxxx>
*Sent:* Monday, August 22, 2022 11:28 AM
*To:* Beckstrom, Jeffrey <jbeckstrom@xxxxxxxxx>
*Cc:* oracle-l@xxxxxxxxxxxxx
*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@xxxxxxxxx>
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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