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When an index rebuild is required at the restart time, it can depend on the connection of the first user accessing the table. If the connection is killed, the index rebuild need to redone.It would be smarter to let the rebuild complete even if the...
Support of Google Cloud Platform (GCP) for automated HADR(with TSA)
Customers are able to deploy a pair of virtual machines(VMs) from the Google Cloud Platform(GCP) and configure a Db2 HADR database pair between the two VMs. They can then furthermore configure HADR automation with TSA via the db2haicu utility.The ...
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 pro...
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 licensi...
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