Backup Mml Write Backup Piece | Backup-Restore Hmi Tpc7062Tx 상위 168개 답변

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여기에서 동영상 보기

d여기에서 BACKUP-RESTORE HMI TPC7062TX – backup mml write backup piece 주제에 대한 세부정보를 참조하세요

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backup mml write backup piece 주제에 대한 자세한 내용은 여기를 참조하세요.

MML write backup piece – DBmarlin Docs and Knowledge Base

Backup RMAN Media Management Layer (MML) write wait. Search online. If this article doesn’t have the information you need you can try searching online.

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Source: docs.dbmarlin.com

Date Published: 8/28/2021

RMAN Media Management Layer (MML) Tips

While backing up the database, RMAN client connects to the media manager using … the MML is installed correctly and you can read and write to tape through …

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Source: www.dba-oracle.com

Date Published: 6/9/2021

What is slow RMAN or Media Management Library?

So, we can calculate it and find out how much time RMAN spend waiting MML (e.g writing or querying a backup piece filename) processing …

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Source: levipereira.wordpress.com

Date Published: 12/8/2022

Solved: oracle redolog backup. – Veritas Vox

Solved: Hi, does anyone faced this problem in oaracle redolog backup ? the backup is going solwly? backup :MML create a backup piece wait best.

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Source: vox.veritas.com

Date Published: 10/18/2022

IO wait during backup – oracle-l – FreeLists

collect the same during Level 0 backup. *Before starting Level 0* Backup: MML write backup piece 301955.357264. Backup: MML initialization …

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Source: www.freelists.org

Date Published: 6/23/2021

1.2.6. Media Management Layer – Oracle RMAN Pocket …

Media Management Layer The Media Management Layer (MML) is a third-party piece of software that manages the reading and writing of files to and from tape.

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Source: www.oreilly.com

Date Published: 9/11/2021

performance | Marco’s DBA Blog – WordPress.com

Backup: MML write backup p 10,608,828 0 11,727 1 2.7 6.0. RMAN backup & recovery I/O 288,934 0 3,508 12 0.1 1.8. Remember, the flashback logs are stored …

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Source: dbamarco.wordpress.com

Date Published: 10/19/2022

24 Troubleshooting RMAN Operations – Oracle HTTP Server

See the following example: Backup: MML v1 open backup piece Backup: MML v1 read backup piece Backup: MML v1 write backup piece Backup: MML v1 query backup piece …

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Source: ora-srv.wlv.ac.uk

Date Published: 12/25/2022

주제와 관련된 이미지 backup mml write backup piece

주제와 관련된 더 많은 사진을 참조하십시오 BACKUP-RESTORE HMI TPC7062TX. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.

주제에 대한 기사 평가 backup mml write backup piece

Author: Đoàn Thanh Tân
Views: 조회수 4,639회
Likes: 좋아요 42개
Date Published: 2020. 7. 21.
Video Url link: https://www.youtube.com/watch?v=ImM09onFumI

Backup: MML write backup piece

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Backup: MML write backup piece

Short Description Backup RMAN Media Management Layer (MML) write wait.

If this article doesn’t have the information you need you can try searching online. Remember, you can contribute suggestions to this page.

RMAN Media Management Layer (MML) Tips

RMAN Using the Media Management Layer

To store the backup of your database on external tape drives, you need to install the media manager software of the third-part vendor and use Media Management Layer (MML) APIs that are available in RMAN. While backing up the database, RMAN client connects to the media manager using specific allocated channels via the target database instance. To install the third part media manager, you need to refer to the vendor’s software documentation for instructions.

To establish the connection, allocate a channel for RMAN by specifying the sbt_library parameter with the path to the library of the media manager. The general syntax is:

RMAN>configure channel device type sbt parms sbt_library=pathname’;

To test the media manager connection, allocate a channel and examine an RMAN output. In order to test the backup and restore, perform backup of spfile and its restoration.

The sbttest Utility

Using this diagnostic tool, RMAN checks whether it can connect to the third part tape drive incorporating your current media manager configuration settings. This tool checks whether the MML is installed correctly and you can read and write to tape through SBT API. Just call the executable by passing a filename as a parameter and check the result. If you get the following lines as a result, then the test was successful:

-bash-3.2$ sbttest test_file

The sbt function pointers are loaded from libobk.so library.

— sbtinit succeeded

— sbtinit (2nd time) succeeded

To get the list of all parameters that the sbttest tool supports, run it without any parameters:

Error: backup file name must be specified

Usage: sbttest backup_file_name # this is the only required parameter

<-dbname database_name>

<-trace trace_file_name>

<-remove_before>

<-no_remove_after>

<-read_only>

<-no_regular_backup_restore>

<-no_proxy_backup>

<-no_proxy_restore>

<-file_type n>

<-copy_number n>

<-media_pool n>

<-os_res_size n>

<-pl_res_size n>

<-block_size block_size>

<-block_count block_count>

<-proxy_file os_file_name bk_file_name [os_res_size pl_res_size block_size block_count]>

<-libname sbt_library_name>

Simulating SBT Channel

If you do not have any tape drives but you want to stimulate a tape backup, you can use an API named disksbt while allocating a channel. The channel will be allocated as a tape channel allocation. Look at the following example:

RMAN> run {

allocate channel ch1 device type ‘sbt_tape’

parms=”sbt_library=oracle.disksbt, env=(backup_dir=/tmp/backup)”;

backup datafile 1 format=’%u’;

}

using target database control file instead of recovery catalog

allocated channel: ch1

channel ch1: SID=31 device type=sbt_tape

channel ch1: WARNING: Oracle Test Disk API

As this shows, RMAN reacts as it is connecting to the tape drive and the warning Oracle Test Disk API? appears in the output.

To make it a default channel, change the RMAN configuration as follows:

RMAN> configure channel device type ‘sbt_tape’

parms=”sbt_library=oracle.disksbt,

env=(backup_dir=/tmp/backup)”;

Now make the default device type as tape:

configure default device type to sbt_tape;

After making the above configuration, take backup of any file and you see that RMAN uses a tape backup instead of disk backup.

What is slow RMAN or Media Management Library?

What is slow RMAN or Media Management Library?

Backup execution time is slow.. where is the problem?

When we perform backup using third party software and backup of database is slow, there always is some uncertain who is causing the slowness.

The Database Administrator (DBA) says: is Media Management Library (aka MML) and Backup Operator says: is RMAN.

To end this conflict I will show how to identify where is the problem.

I’ll use the term RMAN (like RMAN spend time), but actually means Database spend time. Because RMAN is only a client. So typically the database is slow and not RMAN Client is slow.

Note: I will not diagnose what is causing it, I will only help you identify whether the problem is, in MML or RMAN.

Media Management

The Oracle Media Management Layer (MML) API lets third-party vendors build a media manager, software that works with RMAN and the vendor’s hardware to allow backups to sequential media devices such as tape drives. A media manager handles loading, unloading, and labeling of sequential media such as tapes.

RMAN Interaction with a Media Manager

RMAN does not issue specific commands to load, label, or unload tapes. When backing up, RMAN gives the media manager a stream of bytes and associates a unique name with this stream. When RMAN must restore the backup, it asks the media manager to retrieve the byte stream. All details of how and where that stream is stored are handled entirely by the media manager. For example, the media manager labels and keeps track of the tape and names of files on each tape, and automatically loads and unloads tapes, or signals an operator to do so.

RMAN provides a list of files requiring backup or restore to the media manager, which in turn makes all decisions regarding how and when to move the data.

Before RMAN making a call to any of functions in the media management API, the server create a EVENT WAIT. So, These with EVENT WAIT is possible to get the number of wait (in seconds or number) that the server has been waiting for this call to return.

So, we can calculate it and find out how much time RMAN spend waiting MML (e.g writing or querying a backup piece filename) processing request and return to RMAN.

Complete list EVENT of MML

Oracle 11.2 or above:

SELECT NAME FROM V$EVENT_NAME WHERE NAME LIKE ‘%MML%’; NAME —————————————- Backup: MML initialization Backup: MML v1 open backup piece Backup: MML v1 read backup piece Backup: MML v1 write backup piece Backup: MML v1 close backup piece Backup: MML v1 query backup piece Backup: MML v1 delete backup piece Backup: MML create a backup piece Backup: MML commit backup piece Backup: MML command to channel Backup: MML shutdown Backup: MML obtain textual error Backup: MML query backup piece Backup: MML extended initialization Backup: MML read backup piece Backup: MML delete backup piece Backup: MML restore backup piece Backup: MML write backup piece Backup: MML proxy initialize backup Backup: MML proxy cancel Backup: MML proxy commit backup piece Backup: MML proxy session end Backup: MML datafile proxy backup? Backup: MML datafile proxy restore? Backup: MML proxy initialize restore Backup: MML proxy start data movement Backup: MML data movement done? Backup: MML proxy prepare to start Backup: MML obtain a direct buffer Backup: MML release a direct buffer Backup: MML get base address Backup: MML query for direct buffers

Previous version of Oracle Database 11.2 the Event name MML does not exists because it’s was changed on version 11.2 from %STB% to %MML%.

So, If you are using Oracle 11.1 or previous you can query V$EVENT_NAME where NAME like ‘%sbt%’.

SELECT NAME FROM V$EVENT_NAME WHERE NAME LIKE ‘%sbt%’; Backup: sbtinit Backup: ssbtopen Backup: ssbtread Backup: ssbtwrite Backup: ssbtbackup . . .

So, lets start…

Oracle store statistics (cumulative, since database was started) of these wait on v$system_event. I always use GV$ because is very common we admin RAC env on this days.

Before start backup I’ll take a snapshot intial of gv$system_event…by creating a table RMAN_MML_EVENT_T1.

Click on icon “View Source” to see formated text.

CREATE TABLE RMAN_MML_EVENT_T1 AS SELECT inst_id, event, TOTAL_WAITS, TOTAL_TIMEOUTS, TIME_WAITED, AVERAGE_WAIT, TIME_WAITED_MICRO, sysdate as SNAPSHOT_TIME FROM gv$system_event WHERE event LIKE ‘Backup%’; SQL> select * from RMAN_MML_EVENT_T1; INST_ID EVENT TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED AVERAGE_WAIT TIME_WAITED_MICRO SNAPSHOT_TIME ———- ————————————— ———– ————– ———– ———— —————– —————– 1 Backup: MML initialization 371 0 54365 146.54 543651136 08-08-12 17:11:05 1 Backup: MML create a backup piece 450 0 4827 10.73 48270960 08-08-12 17:11:05 1 Backup: MML commit backup piece 450 0 7417 16.48 74172281 08-08-12 17:11:05 1 Backup: MML shutdown 371 0 47 .13 469267 08-08-12 17:11:05 1 Backup: MML query backup piece 894 0 11222 12.55 112222166 08-08-12 17:11:05 1 Backup: MML extended initialization 371 0 0 0 3655 08-08-12 17:11:05 1 Backup: MML delete backup piece 444 0 5348 12.05 53480530 08-08-12 17:11:05 1 Backup: MML write backup piece 1378078 0 3053683 2.22 3.0537E+10 08-08-12 17:11:05 8 rows selected.

I started backup using RMAN and MML (Tivoli Storage Manager). When backup finished you can query V$RMAN_BACKUP_JOB_DETAILS to get accurate time of backup

SELECT START_TIME, END_TIME, ROUND(INPUT_BYTES /1024/1024/1024,2) IMPUT_GBYTES , ROUND(OUTPUT_BYTES /1024/1024/1024,2) OUTPUT_GBYTES, INPUT_TYPE, ELAPSED_SECONDS FROM V$RMAN_BACKUP_JOB_DETAILS WHERE TRUNC(START_TIME) = TRUNC(SYSDATE) AND INPUT_TYPE LIKE ‘DB%’; START_TIME END_TIME IMPUT_GBYTES OUTPUT_GBYTES INPUT_TYPE ELAPSED_SECONDS —————– —————– ———— ————- ————- ————— 08-08-12 17:23:44 08-08-12 17:26:38 12.85 10.06 DB FULL 174

In my case the backup full take 174 seconds to backup read 12.85GB and Write on MML 10.06GB of data

So, after backup finish I take the 2nd snapshot by creating the table RMAN_SNAPSHOT_T2.

CREATE TABLE RMAN_SNAPSHOT_T2 AS SELECT inst_id, event, TOTAL_WAITS, TOTAL_TIMEOUTS, TIME_WAITED, AVERAGE_WAIT, TIME_WAITED_MICRO, sysdate as SNAPSHOT_TIME FROM gv$system_event WHERE event LIKE ‘Backup%’; SQL> select * from RMAN_MML_EVENT_T2; INST_ID EVENT TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED AVERAGE_WAIT TIME_WAITED_MICRO SNAPSHOT_TIME ———- ————————————— ———– ————– ———– ———— —————– —————– 1 Backup: MML initialization 373 0 54665 146.56 546652333 08-08-12 17:27:45 1 Backup: MML create a backup piece 454 0 4860 10.71 48604759 08-08-12 17:27:45 1 Backup: MML commit backup piece 454 0 7482 16.48 74820999 08-08-12 17:27:45 1 Backup: MML shutdown 373 0 47 .13 471590 08-08-12 17:27:45 1 Backup: MML query backup piece 900 0 11281 12.53 112808077 08-08-12 17:27:45 1 Backup: MML extended initialization 373 0 0 0 3665 08-08-12 17:27:45 1 Backup: MML delete backup piece 446 0 5373 12.05 53727006 08-08-12 17:27:45 1 Backup: MML write backup piece 1419274 0 3067298 2.16 3.0673E+10 08-08-12 17:27:45 8 rows selected.

Now I can calculate the values from RMAN_MML_EVENT_T2 minus RMAN_MML_EVENT_T1 to get the real time spend on MML.

Note:

EVENT: Name of the wait event

TOTAL_WAITS: Total number of waits for the event

TOTAL_TIMEOUTS: Total number of timeouts for the event

TIME_WAITED: Total amount of time waited for the event (in hundredths of a second)

AVERAGE_WAIT: Average amount of time waited for the event (in hundredths of a second)

TIME_WAITED_MICRO: Total amount of time waited for the event (in microseconds)

SELECT t1.inst_id, t1.event, t2.total_waits – t1.total_waits total_waits, t2.total_timeouts -t1.total_timeouts total_timeouts, t2.time_waited – t1.time_waited time_waited, t2.time_waited_micro – t1.time_waited_micro time_waited_micro FROM RMAN_MML_EVENT_T1 T1, RMAN_MML_EVENT_T2 T2 WHERE t1.inst_id = t2.inst_id AND t1.event = t2.event; INST_ID EVENT TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED TIME_WAITED_MICRO ———- ————————————— ———– ————– ———– —————– 1 Backup: MML initialization 2 0 300 3001197 1 Backup: MML create a backup piece 4 0 33 333799 1 Backup: MML commit backup piece 4 0 65 648718 1 Backup: MML shutdown 2 0 0 2323 1 Backup: MML query backup piece 6 0 59 585911 1 Backup: MML extended initialization 2 0 0 10 1 Backup: MML delete backup piece 2 0 25 246476 1 Backup: MML write backup piece 41196 0 13615 136141912 8 rows selected.

As I can see above the MML spend more time writing backup piece.

So, I’ll sum the time to get total time spend on MML.

SELECT SUM (total_waits) total_waits, SUM(total_timeouts) total_timeouts , SUM (time_waited)/100 time_waited_in_second, SUM (time_waited_micro) time_waited_micro FROM (SELECT t1.inst_id, t1.event, t2.total_waits – t1.total_waits total_waits, t2.total_timeouts -t1.total_timeouts total_timeouts, t2.time_waited – t1.time_waited time_waited, t2.time_waited_micro – t1.time_waited_micro time_waited_micro FROM RMAN_MML_EVENT_T1 T1, RMAN_MML_EVENT_T2 T2 WHERE t1.inst_id = t2.inst_id AND t1.event = t2.event ) TOTAL_WAITS TOTAL_TIMEOUTS TIME_WAITED_IN_SECOND TIME_WAITED_MICRO ———– ————– ——————— —————– 41218 0 140.97 140960346

Calculating time total of backup window, time spend on MML and time spend of RMAN.

Note: TIME_SPEND_BY_RMAN = (ELAPSED_SECOND_BACKUP-TIME_SPEND_BY_MML_SECOND)

ELAPSED_SECONDS_BACKUP TIME_SPEND_BY_MML_SECOND TIME_SPEND_BY_RMAN_SECOND —————————— —————————— ——————- 174 140.97 33.03

Summarizing:

Total time of backup : 174

Time spend by MML: 141

Time spend by RMAN : 33

If this backup is slow is because MML take (141*100/174) 81% of time spend of backup window.

Additional info:

As my backup was done over Lan:

(10.06GB * 1024 = 10301MB)

10301MB / 144 = 71Mbytes/second

As I’m using network interface of 1 Gbit I can consider a normal throughput.

Also you can monitoring in real time where is wait.

Just execute this script above:

Note : if you are using previous version of 11.2 change %MML% to %sbt%.

vi monitoring_mml.sh sqlplus -s sys/@ as sysdba<

Solved: oracle redolog backup.

There are many variables. First thing to try is backup to disk vs tape.

Also, I found this interesting article:

What is slow RMAN or Media Management Library?

http://levipereira.wordpress.com/2012/08/09/what-is-slow-rman-or-media-management-library/

IO wait during backup

IO wait during backup

From: manikandan
To: “oracle-l@xxxxxxxxxxxxx”

Date: Tue, 12 May 2020 00:56:12 -0400

Hi,

Env is 2 node RAC (12.2 GI + RDBMS) on Linux.

We are seeing significant amount of IO wait during level 0 backups (weekly

once) and level 1 backups (daily). RMAN backup is running on Node A and

Golden Gate is running on Node B. The below are some artifacts

*iostat——*

*Node A*

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz

avgqu-sz await r_await w_await svctm %util

sda 0.00 0.00 0.00 69.00 0.00 600.50 17.41

0.00 0.03 0.00 0.03 0.03 0.20

sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00

sdc 0.00 0.00 7.00 0.00 3584.00 0.00 1024.00

1.29 165.57 165.57 0.00 71.86 50.30

sdd 0.00 0.00 6.00 0.00 3088.00 0.00 1029.33

1.00 213.67 213.67 0.00 39.00 23.40

sde 0.00 0.00 14.00 0.00 1541.50 0.00 220.21

0.91 49.71 49.71 0.00 33.93 47.50

sdf 0.00 0.00 4.00 0.00 3072.00 0.00 1536.00

0.84 176.25 176.25 0.00 144.75 57.90

sdg 0.00 0.00 5.00 0.00 2560.00 0.00 1024.00

0.25 70.40 70.40 0.00 40.80 20.40

sdh 0.00 0.00 6.00 0.00 3072.00 0.00 1024.00

1.15 166.83 166.83 0.00 73.33 44.00

sdi 0.00 0.00 7.00 0.00 3584.00 0.00 1024.00

1.08 129.43 129.43 0.00 62.57 43.80

sdj 0.00 0.00 8.00 0.00 4096.00 0.00 1024.00

0.46 120.50 120.50 0.00 29.75 23.80

sdk 0.00 0.00 10.00 0.00 5120.00 0.00 1024.00

0.97 86.20 86.20 0.00 58.40 58.40

sdl 0.00 0.00 11.00 0.00 5120.00 0.00 930.91

1.25 83.91 83.91 0.00 48.09 52.90

sdm 0.00 0.00 7.00 0.00 3080.00 0.00 880.00

0.89 198.00 198.00 0.00 65.00 45.50

sdn 0.00 0.00 10.00 0.00 4096.50 0.00 819.30

0.65 76.20 76.20 0.00 41.30 41.30

sdo 0.00 0.00 16.00 0.00 7168.00 0.00 896.00

1.21 69.94 69.94 0.00 35.00 56.00

………….

………….

emcpowerc 0.00 0.00 50.00 1.00 24608.00 16.00 965.65

3.28 64.35 64.90 37.00 10.39 53.00

emcpowerf 0.00 0.00 52.00 0.00 24632.00 0.00 947.38

2.86 55.02 55.02 0.00 9.60 49.90

emcpowerd 0.00 0.00 140.00 0.00 28714.00 0.00 410.20

6.93 49.21 49.21 0.00 7.10 99.40

emcpowerb 0.00 0.00 64.00 0.00 32768.00 0.00 1024.00

3.56 55.62 55.62 0.00 5.81 37.20

emcpowere 0.00 0.00 51.00 0.00 24624.00 0.00 965.65

2.66 52.14 52.14 0.00 7.73 39.40

emcpowerg 0.00 0.00 64.00 0.00 32768.00 0.00 1024.00

3.42 56.77 56.77 0.00 5.77 36.90

emcpowerbw 0.00 0.00 59.00 0.00 28696.00 0.00 972.75

3.83 56.97 56.97 0.00 9.34 55.10

emcpowerh 0.00 0.00 57.00 0.00 28688.00 0.00 1006.60

3.15 52.25 52.25 0.00 6.16 35.10

emcpowerbv 0.00 0.00 56.00 0.00 28672.00 0.00 1024.00

3.49 56.66 56.66 0.00 8.18 45.80

emcpowerj 0.00 0.00 65.00 0.00 32776.00 0.00 1008.49

3.64 56.15 56.15 0.00 6.46 42.00

emcpowerbu 0.00 0.00 64.00 0.00 32768.00 0.00 1024.00

3.38 56.25 56.25 0.00 5.58 35.70

emcpoweri 0.00 0.00 64.00 0.00 32768.00 0.00 1024.00

3.81 56.34 56.34 0.00 7.50 48.00

emcpowerbt 0.00 0.00 57.00 0.00 28680.00 0.00 1006.32

3.10 54.84 54.84 0.00 7.21 41.10

emcpowerl 0.00 0.00 56.00 0.00 28672.00 0.00 1024.00

2.91 51.95 51.95 0.00 7.25 40.60

emcpowerbs 0.00 0.00 67.00 0.00 34304.00 0.00 1024.00

3.76 57.18 57.18 0.00 5.25 35.20

*Node B——*

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz

avgqu-sz await r_await w_await svctm %util

sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00

sdez 0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.00 0.00 0.00 0.00 0.00 0.00

sdfa 0.00 0.00 18.00 0.00 128.00 24.00 16.89

1.24 82.00 82.00 0.00 39.00 70.20

sdfb 0.00 0.00 17.00 1.00 120.00 16.00 15.11

1.41 73.50 73.00 82.00 45.33 81.60

sdfc 0.00 0.00 8.00 1.00 40.00 16.00 12.44

0.90 76.22 75.75 80.00 56.22 50.60

sdfd 0.00 0.00 10.00 1.00 80.00 16.00 17.45

0.69 71.36 70.80 77.00 31.36 34.50

sdfe 0.00 0.00 12.00 3.00 96.00 24.00 16.00

0.53 70.00 70.08 69.67 22.93 34.40

sdff 0.00 0.00 12.00 0.00 88.00 4.00 15.33

0.84 93.50 93.50 0.00 42.25 50.70

sdfg 0.00 0.00 8.00 2.00 64.00 136.00 40.00

0.61 66.40 66.12 67.50 30.80 30.80

sdfh 0.00 0.00 20.00 1.00 120.00 8.00 12.19

1.62 73.19 74.05 56.00 39.29 82.50

sdfi 0.00 0.00 9.00 0.00 64.00 0.00 14.22

0.54 92.67 92.67 0.00 42.89 38.60

…………

………..

emcpoweraw 0.00 0.00 14.00 1.00 112.00 16.00 17.07

3.69 291.93 292.36 286.00 61.40 92.10

emcpowerav 0.00 0.00 9.00 0.00 72.00 0.00 16.00

2.58 291.78 291.78 0.00 94.44 85.00

emcpowerax 0.00 0.00 5.00 2.00 40.00 16.00 16.00

2.66 288.71 291.60 281.50 131.57 92.10

emcpowerbi 0.00 0.00 5.00 1.00 40.00 8.00 16.00

1.96 297.17 298.80 289.00 139.67 83.80

emcpowerbh 0.00 0.00 8.00 0.00 64.00 0.00 16.00

2.43 293.88 293.88 0.00 115.25 92.20

emcpowerbg 0.00 0.00 5.00 0.00 40.00 0.00 16.00

1.60 289.40 289.40 0.00 179.60 89.80

emcpowerbf 0.00 0.00 5.00 0.00 40.00 0.00 16.00

2.07 293.40 293.40 0.00 184.00 92.00

emcpowerbe 0.00 0.00 11.00 0.00 88.00 0.00 16.00

3.12 294.18 294.18 0.00 89.27 98.20

emcpowerbd 0.00 0.00 4.00 1.00 32.00 8.00 16.00

0.85 283.40 279.75 298.00 132.80 66.40

emcpowerbc 0.00 0.00 6.00 1.00 48.00 8.00 16.00

2.29 288.71 289.67 283.00 128.43 89.90

emcpowerbb 0.00 0.00 10.00 0.00 80.00 0.00 16.00

3.02 291.80 291.80 0.00 100.00 100.00

emcpowerba 0.00 0.00 10.00 0.00 80.00 0.00 16.00

2.83 292.80 292.80 0.00 84.20 84.20

emcpoweraz 0.00 0.00 8.00 1.00 64.00 8.00 16.00

2.26 291.89 291.75 293.00 111.11 100.00

emcpoweray 0.00 0.00 5.00 1.00 40.00 8.00 16.00

1.25 288.67 286.80 298.00 94.50 56.70

*vmstat——*

*Node A*

SNAP_INTERVAL 30

CPU_CORES 18

VCPUS 72

OSWBB_ARCHIVE_DEST /ora45/dbworkspace/OSWATCHER/oswbb/archive

zzz ***Sat May 9 01:00:15 EDT 2020

procs ———–memory———- —swap– —–io—- -system–

——cpu—–

r b swpd free buff cache si so bi bo in cs us sy id

wa st

6 123 0 32364372 303780 40037240 0 0 561 153 0 0 3 1

94 3 0

1 125 0 32371232 303780 40037456 0 0 41317 30810 35987 45850 4

1 27 67 0

5 123 0 32371060 303780 40037644 0 0 30972 23008 43202 56629 3

1 27 69 0

zzz ***Sat May 9 01:00:45 EDT 2020

procs ———–memory———- —swap– —–io—- -system–

——cpu—–

r b swpd free buff cache si so bi bo in cs us sy id

wa st

4 119 0 32338792 303780 40038420 0 0 561 153 0 0 3 1

94 3 0

2 124 0 32329172 303780 40038840 0 0 12392 9241 18276 20114 3

1 30 66 0

3 118 0 32334116 303780 40038836 0 0 16690 11341 17579 19183 3

2 32 64 0

*Node B*

SNAP_INTERVAL 30

CPU_CORES 18

VCPUS 72

OSWBB_ARCHIVE_DEST /ora45/dbworkspace/OSWATCHER/oswbb/archive

zzz ***Sat May 9 01:00:15 EDT 2020

procs ———–memory———- —swap– —–io—- -system–

——cpu—–

r b swpd free buff cache si so bi bo in cs us sy id

wa st

6 123 0 32364372 303780 40037240 0 0 561 153 0 0 3 1

94 3 0

1 125 0 32371232 303780 40037456 0 0 41317 30810 35987 45850 4

1 27 67 0

5 123 0 32371060 303780 40037644 0 0 30972 23008 43202 56629 3

1 27 69 0

zzz ***Sat May 9 01:00:45 EDT 2020

procs ———–memory———- —swap– —–io—- -system–

——cpu—–

r b swpd free buff cache si so bi bo in cs us sy id

wa st

4 119 0 32338792 303780 40038420 0 0 561 153 0 0 3 1

94 3 0

2 124 0 32329172 303780 40038840 0 0 12392 9241 18276 20114 3

1 30 66 0

3 118 0 32334116 303780 40038836 0 0 16690 11341 17579 19183 3

2 32 64 0

*From AWR during Level 0 backup*

*Top 10 Foreground Events by Total Wait Time*

*Event*

*Waits*

*Total Wait Time (sec)*

*Avg Wait*

*% DB time*

*Wait Class*

db file sequential read

124,916

8451.4

67.66ms

83.9

User I/O

control file sequential read

25,283

142.3

5.63ms

1.4

System I/O

DB CPU

87.3

.9

log file sync

158

41

259.41ms

.4

Commit

gc current block 2-way

131,697

13.7

104.37us

.1

Cluster

name-service call wait

82

12.4

150.77ms

.1

Other

gc cr grant 2-way

62,345

7.3

117.49us

.1

Cluster

cursor: pin S wait on X

617

5.8

9.40ms

.1

Concurrency

Sync ASM rebalance

9

4.9

545.95ms

.

Other

library cache lock

446

3.8

8.54ms

.

Concurrency

I tried to collect MML wait during Level 1 backup window as I could not

collect the same during Level 0 backup.

*Before starting Level 0*

Backup: MML write backup piece 301955.357264

Backup: MML initialization 0.001998

Backup: MML delete backup piece 79.890461

Backup: MML extended initialization 218.460778

Backup: MML commit backup piece 452.491904

Backup: MML shutdown 642.291437

Backup: MML create a backup piece 52.15988

Backup: MML query backup piece 159.223808

Total 303559.87753

*After*

Backup: MML write backup piece 304953.207321

Backup: MML initialization 0.002076

Backup: MML delete backup piece 79.890461

Backup: MML extended initialization 227.604029

Backup: MML commit backup piece 480.266509

Backup: MML shutdown 657.297723

Backup: MML create a backup piece 83.378908

Backup: MML query backup piece 159.562624

Total 306650.213124

3090.34 MML (306650.213124 – 303559.87753)

4392 Elapsed (2540 + 1852)

1301.66 RMAN (Elapsed – MML)

70.36 Percent spent on MML 70% time spent on MML

Archive log backup also started during ID backup, so elapsed time

calculated as sum of ID and Archive.

5/10/2020 11:01:55 PM 5/10/2020 11:44:15 PM 3374.81 313.02 DB

INCR 2540

5/10/2020 11:13:04 PM 5/10/2020 11:43:56 PM 105.58 105.59

ARCHIVELOG 1852

We only see this high load on the server when the backups are running.

I am trying to isolate where is the IO bottleneck before i talk to system

admin, is it on Server side or storage side ? . Also is there any utilities

i can use to monitor IO waits as a non-root user. Please suggest.

Thanks,

Mani

Other related posts:

Oracle RMAN Pocket Reference [Book]

Media Management Layer

The Media Management Layer (MML) is a third-party piece of software that manages the reading and writing of files to and from tape. An MML also keeps track of which files have been written to which tapes. If you want to back up your database files to tape, RMAN requires you to use an MML. If you plan to use RMAN to back up files only to disk, you do not need an MML.

MML tools are often used by System Administrators to back up the host O/S filesystems. If your work environment already uses a MML, you can leverage this architecture to implement RMAN backups to tape. There are several reasons to back up files to tape and thus require an MML:

The expense of storing large backups on disk is too costly.

Your requirement is to back up files somewhere other than on the same server as the target database, thus reducing your risk of losing both the target database and backup files at the same time

When backing up files to tape, an MML keeps track of which files were written to which tapes. In the event that restoration of a database file is required, RMAN communicates to the MML a list of the backup files that are required to restore the database file. The MML then determines which tapes contain the required backup files, retrieves the requested backup files, and passes them back to RMAN; RMAN then restores the database file.

Setting up RMAN to work with an MML can be the most frustrating and difficult part of implementing RMAN. This is because determining the root cause …

Marco’s DBA Blog

One of our customers moved their main application to Oracle Database 12c a couple of days ago. With the new version they experiences a couple of issues that I helped them to resolve or to work around and that I will write about in this and other blog posts.

The first and very heavy issue appeared right from the start. When several people started using the application they waited a long time at a specific point. What we saw at database level was a high number of “Concurrency” waits, namely “Cursor: pin S wait on X”. There must be something, these queries run fine in 11.2.0.4. So we first set “optimizer_features_enable” step by step back to “11.2.0.2”, but it did not change anything. It continued to look like this:

And this was only the beginning… It went on:

This all was caused by only a few statements. It turned out, that during the concurrency periods V$SQL showed a value of zero for PLAN_HASH_VALUE for the particular statements and child cursors. The parsing of the statement took that long, up to five minutes per parse. All the other sessions that were about to run the same statement waited for the first session to complete the parse. And this happend over and over again, either due to new child cursors being created or due to the cursors being aged out of the shared pool.

Currently there as a SR open with Oracle to identify the reason for these extremly long parse times. I will update this post as soon as a I get news.

Meanwhile the workaround is to simply pin the statements in the shared pool. This way we do not need to parse over and over again, we keep all information in shared pool regardless if it is used or not. We still need to do the parse for each child cursor that is needed, but then we are done. So there is a time after restarting a database instance when the parse needs to be done. During this time we identify the statements and pin them again.

The following are examples only, it has nothing to do with the real issue.

SQL> select sql_id, executions, plan_hash_value, address, hash_value from v$sql where sql_id=’94qn6y14kw01g’; SQL_ID EXECUTIONS PLAN_HASH_VALUE ADDRESS HASH_VALUE ————- ———- ————— —————- ———- 94qn6y14kw01g 255 1388734953 00000000CE3DB1E8 1227751471

We use ADDRESS and HASH_VALUE to pin the cursor:

SQL> exec dbms_shared_pool.keep(‘00000000CE3DB1E8,1227751471’, ‘C’); PL/SQL procedure successfully completed.

To identify the statements that are already pinned, use a query similar to this:

SQL> select name, executions, status, 2 (select sql_id from v$sql s where s.hash_value = c.hash_value and rownum=1) sql_id 3 from v$db_object_cache c 4 where kept=’YES’ and type=’CURSOR’; NAME ——————————————————————————– EXECUTIONS STATUS SQL_ID ———- ——————- ————- SELECT NVL(TO_NUMBER(EXTRACT(XMLTYPE(:B2 ), :B1 )), 0) FROM DUAL 273 VALID 94qn6y14kw01g SELECT NVL(TO_NUMBER(EXTRACT(XMLTYPE(:B2 ), :B1 )), 0) FROM DUAL 273 VALID 94qn6y14kw01g

After a while, to load reduced and then continued at normal level.

I am now waiting for Oracle Support to provide information about the root cause and for the fix of this issue.

Troubleshooting RMAN Operations

If a media manager error occurs, ORA-19511 is signaled, and the media manager is expected to provide RMAN a descriptive error. RMAN displays the error passed back to it by the media manager.

For example, you might see this:

ORA-19511: Error received from media manager layer, error text: sbtpvt_open_input: file .* does not exist or cannot be accessed, errno = 2

The message from the media manager should provide you with enough information to let you fix the root problem. If it does not, then refer to the documentation for your media manager or contact your media management vendor support representative for further information. ORA-19511 errors originate with the media manager, not with Oracle Database. The database just passes on the message from the media manager. The cause can be addressed only by the media management vendor.

If you are still using an SBT 1.1-compliant media management layer, you may see some additional error message text. Output from an SBT 1.1-compliant media management layer is similar to the following:

ORA-19507: failed to retrieve sequential file, handle=”c-140148591-20031014-06″, parms=”” ORA-27007: failed to open file Additional information: 7000 Additional information: 2 ORA-19511: Error received from media manager layer, error text: SBT error = 7000, errno = 0, sbtopen: backup file not found

The “Additional information” provided uses error codes specific to SBT 1.1. The values displayed correspond to the media manager message numbers and error text listed in Table 24-3. RMAN again signals the error, as an ORA-19511 Error received from media manager layer error, and a general error message related to the error code returned from the media manager and including the SBT 1.1 error number is then displayed.

The SBT 1.1 error messages are listed here for your reference. Table 24-3 lists media manager message numbers and their corresponding error text. In the error codes, O/S stands for operating system. The errors marked with an asterisk (*) are internal and are not typically seen during normal operation.

키워드에 대한 정보 backup mml write backup piece

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