RE: [EXTERNAL] Re: rman backup slow even after patching it
Date: Tue, 23 Aug 2022 11:42:35 +0000
Message-ID: <DM6PR09MB4677D4CBE9A22A433CF80CADDF709_at_DM6PR09MB4677.namprd09.prod.outlook.com>
50 to 100% slower
From: niall.litchfield_at_gmail.com <niall.litchfield_at_gmail.com>
Sent: Monday, August 22, 2022 11:28 AM
What does "slow" mean in this context?
On Mon, Aug 15, 2022 at 6:37 PM Beckstrom, Jeffrey <jbeckstrom_at_gcrta.org<mailto: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:
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
--
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To: Beckstrom, Jeffrey <jbeckstrom_at_gcrta.org>
Cc: oracle-l_at_freelists.org
Subject: [EXTERNAL] Re: rman backup slow even after patching it
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
Greater Cleveland Regional Transit Authority
1240 W. 6th Street
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Niall Litchfield
Oracle DBA
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Received on Tue Aug 23 2022 - 13:42:35 CEST