Comments on: Centralized TAF Configuration in 10g, Part 2 http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/ Jeremy Schneider Wed, 30 Nov 2011 21:26:13 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Charles Schultz http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-1548 Charles Schultz Thu, 09 Jul 2009 14:26:33 +0000 http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-1548 I am not having a whole ton of luck with this. =) Given: currently, bannerbcp is the primary and oradev is the standby tns entry is chuck = (DESCRIPTION= (ADDRESS_LIST= (LOAD_BALANCE=off)(FAILOVER=on) (ADDRESS=(PROTOCOL=TCP)(HOST=bannerbcp)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=oradev)(PORT=1521)) ) (CONNECT_DATA= (SERVER=DEDICATED) (SERVICE_NAME=eas-dev) (FAILOVER_MODE=(TYPE=SESSION)(METHOD=BASIC)(RETRIES=180)(DELAY=5)))) Server-side TAF is configured; note how the TYPE is different than specified in the tns string. USERNAME SERVICE_NAME FAILOVER_M FAILOVER_TYPE ---------- -------------------- ---------- ------------- ORACLE eas-dev BASIC SELECT I have observed the following: - if LOAD_BALANCE is on, I sometimes get the standby (ORA-01033) - if LOAD_BALANCE is off and FAILOVER is on, I always get the first ADDRESS. At least, this has proven true after 10 tests and switching the order for half of them. - If both LOAD_BALANCE and FAILOVER are off, I always get the first ADDRESS (same as above). What is FAILOVER doing for me? I have a gut feeling that I know just enough to get myself in trouble and really confuse things. =) I am not having a whole ton of luck with this. =)

Given:
currently, bannerbcp is the primary and oradev is the standby

tns entry is
chuck = (DESCRIPTION=
(ADDRESS_LIST=
(LOAD_BALANCE=off)(FAILOVER=on) (ADDRESS=(PROTOCOL=TCP)(HOST=bannerbcp)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=oradev)(PORT=1521))
)
(CONNECT_DATA=
(SERVER=DEDICATED)
(SERVICE_NAME=eas-dev) (FAILOVER_MODE=(TYPE=SESSION)(METHOD=BASIC)(RETRIES=180)(DELAY=5))))

Server-side TAF is configured; note how the TYPE is different than specified in the tns string.

USERNAME SERVICE_NAME FAILOVER_M FAILOVER_TYPE
———- ——————– ———- ————-
ORACLE eas-dev BASIC SELECT

I have observed the following:
- if LOAD_BALANCE is on, I sometimes get the standby (ORA-01033)
- if LOAD_BALANCE is off and FAILOVER is on, I always get the first ADDRESS. At least, this has proven true after 10 tests and switching the order for half of them.
- If both LOAD_BALANCE and FAILOVER are off, I always get the first ADDRESS (same as above). What is FAILOVER doing for me?

I have a gut feeling that I know just enough to get myself in trouble and really confuse things. =)

]]> By: Hank http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-783 Hank Thu, 08 Nov 2007 21:58:16 +0000 http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-783 Jeremy: Just want to know if TAF can be applied on Primary and Standby database, when primary is not available, fast fail-over happens and service is still available. In RAC env, we can use vips, can we use this concept in standby database? Thanks, Hank NJ Jeremy:

Just want to know if TAF can be applied on Primary and Standby database, when primary is not available, fast fail-over happens and service is still available.

In RAC env, we can use vips, can we use this concept in standby database?

Thanks,

Hank
NJ

]]> By: Centralized TAF Configuration in 10g, Part 1 : Ardent Performance Computing http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-94 Centralized TAF Configuration in 10g, Part 1 : Ardent Performance Computing Tue, 08 May 2007 14:24:33 +0000 http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-94 [...] — Update: part 2 is now available. [...] [...] — Update: part 2 is now available. [...]

]]> By: Jeremy http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-61 Jeremy Mon, 23 Apr 2007 21:18:42 +0000 http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-61 I would recommend doing a little more reading; clustering with Oracle can be a little complicated and it's good to have a solid understanding of the basics before you try to implement it. Regarding your questions, of course RAC (Real Application Clusters) and TAF (Transparent Application Failover) work together. It is unclear to me what you're saying about standby and RAC. Anyway Oracle's High Availability manual is a great place to start reading: <a href="http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14210/hafeatures.htm#i1007163" rel="nofollow">download-west.oracle.com/docs/cd/B19306_01/server.102/ b14210/hafeatures.htm#i1007163</a> Also, this is a good guide to getting the most benefit from online communities: http://www.catb.org/~esr/faqs/smart-questions.html I would recommend doing a little more reading; clustering with Oracle can be a little complicated and it’s good to have a solid understanding of the basics before you try to implement it.

Regarding your questions, of course RAC (Real Application Clusters) and TAF (Transparent Application Failover) work together. It is unclear to me what you’re saying about standby and RAC.

Anyway Oracle’s High Availability manual is a great place to start reading:
download-west.oracle.com/docs/cd/B19306_01/server.102/ b14210/hafeatures.htm#i1007163

Also, this is a good guide to getting the most benefit from online communities:
http://www.catb.org/~esr/faqs/smart-questions.html

]]> By: Fahd Mirza http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-47 Fahd Mirza Mon, 02 Apr 2007 05:57:32 +0000 http://www.ardentperf.com/2007/03/29/centralized-taf-configuration-in-10g-part-2/#comment-47 Now, with your posts, you have put lots of seeds of doubts in my mind. I am using 9i, but will soon migrate to 10g. I haven't used TAF yet, but have always used standby database. Now in 10g I am going to use RAC. After reading your post, I am perplexed, which option to use. I was planning to use a 2-node RAC, with one hot standby. Can TAF and RAC go hand in hand? Please pardon, if I am getting all of it awfully wrong from the start. regards. Now, with your posts, you have put lots of seeds of doubts in my mind.

I am using 9i, but will soon migrate to 10g. I haven’t used TAF yet, but have always used standby database. Now in 10g I am going to use RAC. After reading your post, I am perplexed, which option to use. I was planning to use a 2-node RAC, with one hot standby.

Can TAF and RAC go hand in hand? Please pardon, if I am getting all of it awfully wrong from the start.

regards.

]]>