URGENT: Hot Standby Graceful failover and failback
Good morning everyone, HELP! HELP!!! It's very early in the morning and I'm still struggling with the Oracle Hot Standby - 8.0.5 and 8I. ARGH! Ok, I got the failover going. I can activate the standby database and use it as a normal database. But when I try to turn it into a standby database again and then reactivate it again, it errors out on me. Oracle Support just tells me that I'm not supposed to use it this way. HUH? I'm not trying to put it back in standby mode so I can recover from the original primary database! I want to put it back in standby mode to similulate a total primary site loss. And always have a standby database to activate. Ok, I may be rambling on a bit here. Very tired. So here's what I've done so far: 1. create a hot standby from a primary database 2. activate the hot standby 3. shutdown the new primary and made a backup of the new primary database 4. restart the new primary, created a table and create a standby controlfile 5. shutdown the new primary 6. restore from backup created in step 3, and replaced the current control files with the standby controlfiles created from stop 4 7. mounted the database in standby mode again 8. tried to activate the new standby database but it failed with ORA-1152 and ORA-1110 complaining that the system.dbf is not restored from a sufficiently old backup. Argh! How do we have a continuous failover and failback scenario? Any help would be greatly appreciated. I've just discovered Lawrence To's article on Graceful Switch Over and Switch back as well. The following from page 11 scares me: "Graceful switchover and switchback are not possible when the production database's online redo logs are not accessible. A graceful switchover and switch back is NOT possible whenever a production database or standby database executes one of the following: - alter database open resetlogs or - alter database activate standby database (which does an implicit resetlogs operation)" HUH??? There are certainly times when we have to do a resetlogs. One of the problems our Unix boxes have at the moment is a redo log corruption so there are not choices but to resetlogs. So what does this all mean? That if we resetlogs we can't ever have continuous failover and failback? ARGH!! What am I dealing with here! I need a holiday from this crazy scenario! Ok, please let me know if you've had any success with what I'm describing here. Am I aiming for the impossible? Surely not! Thanks, Leng. = Leng Kaing - [EMAIL PROTECTED] AUSOUG-VIC : http://www.ausoug.org/vic/ _ http://movies.yahoo.com.au - Yahoo! Movies - Now showing: Dude Where's My Car, The Wedding Planner, Traffic.. -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Leng=20Kaing?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: URGENT: Hot Standby Graceful failover and failback
I think you may be trying to do a little too much with the current standby architecture. Oracle now has product called Data Guard that will let you do what you want. I've only read the docs on Data Guard, but supposedly you can switch primary and standby database, and switch back without re-creating anything. Good luck Mike The views expressed here are mine and do not reflect the official position of my employer or the organization through which the internet was accessed. -Original Message- From: Leng Kaing [SMTP:[EMAIL PROTECTED]] Sent: Tuesday, April 17, 2001 12:10 PM To: Multiple recipients of list ORACLE-L Subject: URGENT: Hot Standby Graceful failover and failback Good morning everyone, HELP! HELP!!! It's very early in the morning and I'm still struggling with the Oracle Hot Standby - 8.0.5 and 8I. ARGH! Ok, I got the failover going. I can activate the standby database and use it as a normal database. But when I try to turn it into a standby database again and then reactivate it again, it errors out on me. Oracle Support just tells me that I'm not supposed to use it this way. HUH? I'm not trying to put it back in standby mode so I can recover from the original primary database! I want to put it back in standby mode to similulate a total primary site loss. And always have a standby database to activate. Ok, I may be rambling on a bit here. Very tired. So here's what I've done so far: 1. create a hot standby from a primary database 2. activate the hot standby 3. shutdown the new primary and made a backup of the new primary database 4. restart the new primary, created a table and create a standby controlfile 5. shutdown the new primary 6. restore from backup created in step 3, and replaced the current control files with the standby controlfiles created from stop 4 7. mounted the database in standby mode again 8. tried to activate the new standby database but it failed with ORA-1152 and ORA-1110 complaining that the system.dbf is not restored from a sufficiently old backup. Argh! How do we have a continuous failover and failback scenario? Any help would be greatly appreciated. I've just discovered Lawrence To's article on Graceful Switch Over and Switch back as well. The following from page 11 scares me: "Graceful switchover and switchback are not possible when the production database's online redo logs are not accessible. A graceful switchover and switch back is NOT possible whenever a production database or standby database executes one of the following: - alter database open resetlogs or - alter database activate standby database (which does an implicit resetlogs operation)" HUH??? There are certainly times when we have to do a resetlogs. One of the problems our Unix boxes have at the moment is a redo log corruption so there are not choices but to resetlogs. So what does this all mean? That if we resetlogs we can't ever have continuous failover and failback? ARGH!! What am I dealing with here! I need a holiday from this crazy scenario! Ok, please let me know if you've had any success with what I'm describing here. Am I aiming for the impossible? Surely not! Thanks, Leng. = Leng Kaing - [EMAIL PROTECTED] AUSOUG-VIC : http://www.ausoug.org/vic/ __ ___ http://movies.yahoo.com.au - Yahoo! Movies - Now showing: Dude Where's My Car, The Wedding Planner, Traffic.. -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Leng=20Kaing?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Lanteigne, Mike INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Re: URGENT: Hot Standby Graceful failover and failback
Hello Leng, 1. create a hot standby from a primary database 2. activate the hot standby 3. shutdown the new primary and made a backup of the new primary database 4. restart the new primary, created a table and create a standby controlfile 5. shutdown the new primary 6. restore from backup created in step 3, and replaced the current control files with the standby controlfiles created from stop 4 7. mounted the database in standby mode again 8. tried to activate the new standby database but it failed with ORA-1152 and ORA-1110 complaining that the system.dbf is not restored from a sufficiently old backup. I thought you were supposed to do a hot backup of a new primary and restore it to the old primary. After that, mount the old primary as a new standby. Argh! How do we have a continuous failover and failback scenario? Any help would be greatly appreciated. I've just discovered Lawrence To's article on Graceful Switch Over and Switch back as well. The following from page 11 scares me: "Graceful switchover and switchback are not possible when the production database's online redo logs are not accessible. A graceful switchover and switch back is NOT possible whenever a production database or standby database executes one of the following: - alter database open resetlogs or - alter database activate standby database (which does an implicit resetlogs operation)" HUH??? There are certainly times when we have to do a resetlogs. One of the problems our Unix boxes have at the moment is a redo log corruption so there are not choices but to resetlogs. So what does this all mean? That if we resetlogs we can't ever have continuous failover and failback? Yes, it is correct. If you reset logs or loose the redo logs, forget about "graceful switchover". ARGH!! What am I dealing with here! I need a holiday from this crazy scenario! Ok, please let me know if you've had any success with what I'm describing here. Am I aiming for the impossible? Surely not! I am sorry to admit, but you are :-) So far at 8.1.7 we have only the "graceful switchover", awfully well described in Lawrence To's article. HTH, Michael -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Michael Netrusov INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
