awr报告详解（2）

IO Stats

• Tablespace IO Stats
• File IO Stats

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Tablespace IO Stats

• ordered by IOs (Reads + Writes) desc

Tablespace	Reads	Av Reads/s	Av Rd(ms)	Av Blks/Rd	Writes	Av Writes/s	Buffer Waits	Av Buf Wt(ms)
ICCIDAT01	67,408	14	3.76	3.17	160,261	34	6	0.00
UNDOTBS1	10	0	12.00	1.00	57,771	12	625	0.02
TEMP	15,022	3	8.74	7.24	3,831	1	0	0.00
USERS	68	0	5.44	1.00	971	0	0	0.00
SYSAUX	263	0	5.48	1.00	458	0	0	0.00
SYSTEM	32	0	5.94	1.00	158	0	3	23.33
UNDOTBS2	6	0	16.67	1.00	6	0	0	0.00

显示每个表空间的I/O统计。根据Oracle经验，Av Rd(ms) [Average Reads in milliseconds]不应该超过30，否则认为有I/O争用。

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File IO Stats

• ordered by Tablespace, File

Tablespace	Filename	Reads	Av Reads/s	Av Rd(ms)	Av Blks/Rd	Writes	Av Writes/s	Buffer Waits	Av Buf Wt(ms)
ICCIDAT01	/dev/rora_icci01	5,919	1	4.30	3.73	15,161	3	1	0.00
ICCIDAT01	/dev/rora_icci02	7,692	2	4.12	3.18	16,555	4	0	0.00
ICCIDAT01	/dev/rora_icci03	6,563	1	2.59	3.80	15,746	3	0	0.00
ICCIDAT01	/dev/rora_icci04	8,076	2	2.93	3.11	16,164	3	0	0.00
ICCIDAT01	/dev/rora_icci05	6,555	1	2.61	3.31	21,958	5	0	0.00
ICCIDAT01	/dev/rora_icci06	6,943	1	4.03	3.41	20,574	4	0	0.00
ICCIDAT01	/dev/rora_icci07	7,929	2	4.12	2.87	18,263	4	0	0.00
ICCIDAT01	/dev/rora_icci08	7,719	2	3.83	2.99	17,361	4	0	0.00
ICCIDAT01	/dev/rora_icci09	6,794	1	4.79	3.29	18,425	4	0	0.00
ICCIDAT01	/dev/rora_icci10	211	0	5.31	1.00	6	0	0	0.00
ICCIDAT01	/dev/rora_icci11	1,168	0	4.45	1.00	6	0	0	0.00
ICCIDAT01	/dev/rora_icci12	478	0	4.23	1.00	6	0	0	0.00
ICCIDAT01	/dev/rora_icci13	355	0	5.13	1.00	6	0	0	0.00
ICCIDAT01	/dev/rora_icci14	411	0	4.91	1.00	6	0	1	0.00
ICCIDAT01	/dev/rora_icci15	172	0	5.29	1.00	6	0	1	0.00
ICCIDAT01	/dev/rora_icci16	119	0	7.23	1.00	6	0	1	0.00
ICCIDAT01	/dev/rora_icci17	227	0	6.26	1.00	6	0	1	0.00
ICCIDAT01	/dev/rora_icci18	77	0	8.44	1.00	6	0	1	0.00
SYSAUX	/dev/rora_SYSAUX	263	0	5.48	1.00	458	0	0	0.00
SYSTEM	/dev/rora_SYSTEM	32	0	5.94	1.00	158	0	3	23.33
TEMP	/dev/rora_TEMP	3,653	1	5.67	6.61	827	0	0
TEMP	/dev/rora_TEMP2	2,569	1	4.42	6.70	556	0	0
TEMP	/dev/rora_TEMP3	1,022	0	2.50	16.86	557	0	0
TEMP	/dev/rora_TEMP5	7,778	2	12.43	6.46	1,891	0	0
UNDOTBS1	/dev/rora_UNDO0101	10	0	12.00	1.00	57,771	12	625	0.02
UNDOTBS2	/dev/rora_UNDO0201	6	0	16.67	1.00	6	0	0	0.00
USERS	/dev/rora_USERS	68	0	5.44	1.00	971	0	0	0.00

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Buffer Pool Statistics

• Standard block size Pools D: default, K: keep, R: recycle
• Default Pools for other block sizes: 2k, 4k, 8k, 16k, 32k

P	Number of Buffers	Pool Hit%	Buffer Gets	Physical Reads	Physical Writes	Free Buff Wait	Writ Comp Wait	Buffer Busy Waits
D	401,071	99	15,480,754	213,729	437,340	0	0	634

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Advisory Statistics

• Instance Recovery Stats
• Buffer Pool Advisory
• PGA Aggr Summary
• PGA Aggr Target Stats
• PGA Aggr Target Histogram
• PGA Memory Advisory
• Shared Pool Advisory
• SGA Target Advisory
• Streams Pool Advisory
• Java Pool Advisory

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Instance Recovery Stats

• B: Begin snapshot, E: End snapshot

	Targt MTTR (s)	Estd MTTR (s)	Recovery Estd IOs	Actual Redo Blks	Target Redo Blks	Log File Size Redo Blks	Log Ckpt Timeout Redo Blks	Log Ckpt Interval Redo Blks
B	0	11	369	2316	5807	1883700	5807
E	0	98	116200	1828613	1883700	1883700	5033355

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Buffer Pool Advisory

• Only rows with estimated physical reads >0 are displayed
• ordered by Block Size, Buffers For Estimate

P	Size for Est (M)	Size Factor	Buffers for Estimate	Est Phys Read Factor	Estimated Physical Reads
D	320	0.10	38,380	1.34	10,351,726
D	640	0.19	76,760	1.25	9,657,000
D	960	0.29	115,140	1.08	8,365,242
D	1,280	0.38	153,520	1.04	8,059,415
D	1,600	0.48	191,900	1.02	7,878,202
D	1,920	0.57	230,280	1.01	7,841,140
D	2,240	0.67	268,660	1.01	7,829,141
D	2,560	0.77	307,040	1.01	7,817,370
D	2,880	0.86	345,420	1.01	7,804,884
D	3,200	0.96	383,800	1.00	7,784,014
D	3,344	1.00	401,071	1.00	7,748,403
D	3,520	1.05	422,180	0.99	7,702,243
D	3,840	1.15	460,560	0.99	7,680,429
D	4,160	1.24	498,940	0.99	7,663,046
D	4,480	1.34	537,320	0.99	7,653,232
D	4,800	1.44	575,700	0.99	7,645,544
D	5,120	1.53	614,080	0.98	7,630,008
D	5,440	1.63	652,460	0.98	7,616,886
D	5,760	1.72	690,840	0.98	7,614,591
D	6,080	1.82	729,220	0.98	7,613,191
D	6,400	1.91	767,600	0.98	7,599,930

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PGA Aggr Summary

• PGA cache hit % - percentage of W/A (WorkArea) data processed only in-memory

PGA Cache Hit %	W/A MB Processed	Extra W/A MB Read/Written
87.91	1,100	151

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PGA Aggr Target Stats

• B: Begin snap E: End snap (rows dentified with B or E contain data which is absolute i.e. not diffed over the interval)
• Auto PGA Target - actual workarea memory target
• W/A PGA Used - amount of memory used for all Workareas (manual + auto)
• %PGA W/A Mem - percentage of PGA memory allocated to workareas
• %Auto W/A Mem - percentage of workarea memory controlled by Auto Mem Mgmt
• %Man W/A Mem - percentage of workarea memory under manual control

	PGA Aggr Target(M)	Auto PGA Target(M)	PGA Mem Alloc(M)	W/A PGA Used(M)	%PGA W/A Mem	%Auto W/A Mem	%Man W/A Mem	Global Mem Bound(K)
B	1,024	862	150.36	0.00	0.00	0.00	0.00	104,850
E	1,024	860	154.14	0.00	0.00	0.00	0.00	104,850

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PGA Aggr Target Histogram

• Optimal Executions are purely in-memory operations

Low Optimal	High Optimal	Total Execs	Optimal Execs	1-Pass Execs	M-Pass Execs
2K	4K	1,385	1,385	0	0
64K	128K	28	28	0	0
128K	256K	5	5	0	0
256K	512K	79	79	0	0
512K	1024K	108	108	0	0
1M	2M	7	7	0	0
8M	16M	1	1	0	0
128M	256M	3	2	1	0
256M	512M	1	1	0	0

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PGA Memory Advisory

• When using Auto Memory Mgmt, minimally choose a pga_aggregate_target value where Estd PGA Overalloc Count is 0

PGA Target Est (MB)	Size Factr	W/A MB Processed	Estd Extra W/A MB Read/ Written to Disk	Estd PGA Cache Hit %	Estd PGA Overalloc Count
128	0.13	4,652.12	2,895.99	62.00	0
256	0.25	4,652.12	2,857.13	62.00	0
512	0.50	4,652.12	2,857.13	62.00	0
768	0.75	4,652.12	2,857.13	62.00	0
1,024	1.00	4,652.12	717.82	87.00	0
1,229	1.20	4,652.12	717.82	87.00	0
1,434	1.40	4,652.12	717.82	87.00	0
1,638	1.60	4,652.12	717.82	87.00	0
1,843	1.80	4,652.12	717.82	87.00	0
2,048	2.00	4,652.12	717.82	87.00	0
3,072	3.00	4,652.12	717.82	87.00	0
4,096	4.00	4,652.12	717.82	87.00	0
6,144	6.00	4,652.12	717.82	87.00	0
8,192	8.00	4,652.12	717.82	87.00	0

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Shared Pool Advisory