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Avoid the database, configured in HADR, on primary side experience an outage when the database on the standby side experience any problem.
We use Db2 pureScale in many environments using POWER System. For our disaster recovery strategy we use HADR for each database between sites. In a specific situation of when some standbys databases experienced HADR_FLAGS = STANDBY_RECV_BLOCKED, re...
At present HADR claims to replicate to multiple standbys. While technically true this is practically false. Since all standbys past the 1st one must be in SUPERASYNC once the additional standbys 'glitch' up they stop processing logs and never proc...
db2pd command to report exact operation that causes HADR replay only window
Currently only "Replay only window is active" is reported in db2diag.log, but not the detailed information about the operation that causes the replay only window, such as exact DDL, reorg, runstats, and etc. statements.
aï¼‰HADR replay master contends with replay worker on queue, and lots of latch contention were observed.bï¼‰HADR replay has IO performance issue. Lots of random IOs were observed, and there should be some sort of prefetch IO to improve performance.
TSA Does not Scale, with each database added it consumes 5 - 8% CPU. In our system ZLinux this is the only option we have for auto failover. When we have 10 Databases we are now consuming 50 - 80% CPU just to run TSA and having to pay extra licens...
BACKUP Performance: Incremental and Delta backups should not have to read all tablespace pages.(RIMS)
Backup currently reads ALL pages in the tablespace to examine the pageLSN in order to determine if a page should be included in the image. This is poor for performance, customer want this addressed using a 21th century approach.
Manually confirm whether to switch before TSAMP+HADR automatically switches
In the TSAMP+hadr environment, in the event of a failure, TSAMP will directly switch the active/standby relationship. Sometimes, it may solve the A machine failure recovery time, especially the AB machine transmits a large transaction log. Therefo...
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