Determine the appropriate number of standby redo log file groups.

I read the Oracle docs and below is what Oracle recommended:

(maximum number of logfiles for each thread + 1) * maximum number of threads

Below is what I had on my primary:

select a.group#,b.thread# from v$logfile a, v$log b
where a.group#=b.group#
order by 1

GROUP# THREAD#
1 1
1 1
2 1
2 1
3 2
3 2
4 2
4 2
5 3
5 3
6 3
6 3
7 4
7 4
8 4
8 4
9 5
9 5
10 5
10 5


Based from the formula and what I had on my primary, is it right to say I would need the total of 24 SRL?

(5+1)*4 --five log files for each thread plus one and multiply 4?

thanks

Quote:

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Originally Posted by matthew00

I read the Oracle docs and below is what Oracle recommended:

(maximum number of logfiles for each thread + 1) * maximum number of threads

Below is what I had on my primary:

select a.group#,b.thread# from v$logfile a, v$log b
where a.group#=b.group#
order by 1

GROUP# THREAD#
1 1
1 1
2 1
2 1
3 2
3 2
4 2
4 2
5 3
5 3
6 3
6 3
7 4
7 4
8 4
8 4
9 5
9 5
10 5
10 5


Based from the formula and what I had on my primary, is it right to say I would need the total of 24 SRL?

(5+1)*4 --five log files for each thread plus one and multiply 4?

thanks

---

Correct.
;)

actually, it should be 20 instead of 24. b/c four log files/per thread plus one and multiply by four.

Quote:

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Originally Posted by matthew00

actually, it should be 20 instead of 24. b/c four log files/per thread plus one and multiply by four.

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Seems your first post is confusing because of the duplicate entries in your query.

For example, if you have 5 threads of 2 logs each (or 10 logs), you need an equal number of standby threads (or 10 logs) plus one additional thread ( 2 logs)

10 regular + 12 standby.

Ooops, that makes 22...
:o

can any one let me know where this is documented...i want to read more..

Quote:

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Originally Posted by Mohith123

can any one let me know where this is documented...i want to read more..

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Nothing beats the vendor's documentation, isn't it? :)

Oracle® Data Guard Concepts and Administration
10g Release 2 (10.2)
Part Number B14239-05

Check online at: http://download.oracle.com/docs/cd/B.../create_ps.htm