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
