HDR unusable with 9.40
Posted in 2004
Hi, everybody, I'm in a deep frustration about HDR quality and implementation in 9.40uc4 In fact, 9.40 HDR is totally unusable: by creating a set of indexes over a big table, one can easily get primary into 'forever blocked in checkpoint' and make secondary completely unusable (should be restored from archive) I was trying to create a set of 10 indexes over a rather big table in ANSI database on primary in HDR-replicated pair. The first index in a set of 10 indexes was created successfully. Soon after the second index creation was started, the primary server became blocked in a checkpoint. For about a minute after that, the secondary was trying to write something to a disk, then became silent. Both servers were blocked in a checkpoint. After several hours, I've stopped secondary. Primary became operational immediately. After the secondary was started again, index synchronization (of both indexes) was started (with proper message in 'online.log') from scratch. The first index was synchronized successfully, then second index sync.. and both server became blocked in checkpoint again. I repeated the experiment of starting/stopping secondary several times... And every time both servers were blocked at the synchronization of the second index. That's it. Secondary became totally unusable. I made an attempt to create index keeping secondary offline... One more interesting result: message appeared in 'online.log', indicating, that 'index will be unusable on secondary'. That is, 9.40, unlike 7.x and 9.21, doesn't allow to create indexes on primary with secondary offline. HDR is really, really bad in 9.40 I'm going to file a level-1 bug to IBM/PA ------------------------------------------ Alexey Sonkin Senior Database Administrator ' sending to informix-list