Comments for IT World https://blog.yannickjaquier.com RDBMS, Unix and many more... Wed, 21 Oct 2020 10:08:21 +0000 hourly 1 https://wordpress.org/?v=5.5.1 Comment on Veritas Volume Manager (VxVM) command line examples by Veritas File System (VxFS) tuning https://blog.yannickjaquier.com/linux/veritas-volume-manager-vxvm-command-line-examples.html#comment-11644 Wed, 21 Oct 2020 10:08:21 +0000 http://blog.yannickjaquier.com/?p=1522#comment-11644 […] addition of Veritas Volume Manager (VxVM) Symantec is also proposing Veritas File System (VxFS) that is most of the time used in combination […]

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Comment on Visualizing Active Session History (ASH) to produce Grid Control charts by Yannick Jaquier https://blog.yannickjaquier.com/oracle/visualizing-active-session-history-ash-to-produce-grid-control-charts.html#comment-11637 Thu, 15 Oct 2020 09:40:46 +0000 http://blog.yannickjaquier.com/?p=1351#comment-11637 In reply to Alex.

Alex,

As it is explained in documentation:

V$SYSMETRIC_HISTORY has more history and contains information sampled at different interval (GROUP_ID column, when equal to 3 a sample very 15 seconds with 3 minutes history, when equal to 2 a sample every minute with 1 hour history

Here the TRUNC is just to remove the second part of the sample_time column (to be able to outer join) and I’m not doing any aggregation so no I do not need to divide by 60.

In V$ACTIVE_SESSION_HISTORY we count over a minute period so the need to divide by 60…

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Comment on Visualizing Active Session History (ASH) to produce Grid Control charts by Alex https://blog.yannickjaquier.com/oracle/visualizing-active-session-history-ash-to-produce-grid-control-charts.html#comment-11631 Thu, 08 Oct 2020 16:55:22 +0000 http://blog.yannickjaquier.com/?p=1351#comment-11631 In reply to Yannick Jaquier.

Doubt.

As cpu and bcpu are divided by 60 because of the TRUNC, cpu_ora_consumed shouldn’t be the same way, divided by 60, so that at moment (cpu+bcpu)-cpu_ora_consumed be in minutes?

TRUNC(sample_time,’MI’) AS sample_time,
SUM(DECODE(session_state,’ON CPU’,DECODE(session_type,’BACKGROUND’,0,1),0))/60 AS cpu,
SUM(DECODE(session_state,’ON CPU’,DECODE(session_type,’BACKGROUND’,1,0),0))/60 AS bcpu,

(SELECT
TRUNC(begin_time,’MI’) AS sample_time,
value/100 AS cpu_ora_consumed

DECODE(SIGN((cpu+bcpu)-cpu_ora_consumed), -1, 0, ((cpu+bcpu)-cpu_ora_consumed)) AS cpu_ora_wait,

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Comment on On the importance to have good Hive statistics on your tables by Ankhi https://blog.yannickjaquier.com/hadoop/on-the-importance-to-have-good-hive-statistics-on-your-tables.html#comment-11628 Fri, 02 Oct 2020 17:58:12 +0000 https://blog.yannickjaquier.com/?p=4910#comment-11628 Is statistics collection important to improve the performance of accessing the table?

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Comment on RMAN configuration with Tivoli Data Protection for Oracle (TDPO) by Yannick Jaquier https://blog.yannickjaquier.com/oracle/rman-configuration-with-tivoli-data-protection-for-oracle-tdpo.html#comment-11627 Wed, 30 Sep 2020 08:27:04 +0000 http://blog.yannickjaquier.com/?p=966#comment-11627 In reply to Carmen.

Hello, not sure to understand the question. YOu mean restore a dataase backup file from Tivoli to disk ? I suppose yes it is possible… Try it…

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Comment on RMAN configuration with Tivoli Data Protection for Oracle (TDPO) by Carmen https://blog.yannickjaquier.com/oracle/rman-configuration-with-tivoli-data-protection-for-oracle-tdpo.html#comment-11626 Tue, 29 Sep 2020 14:37:06 +0000 http://blog.yannickjaquier.com/?p=966#comment-11626 Hello, is possible to restore a backup for oracle database to a disk with Tivoli but just using a file system agent?

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