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Allow Read Only Sharing on HADR while Catalog updates
We are trying to use HADR Read only Sharing to allow ad-hoc query against a 4Tb transactional database. The standby should allow us to reduce the impact of ah-hoc business queries.The application is a vendor supplied document storage and retrieval...
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.
In the same way db2iauto starts instance once the server is rebooted, the HADR should restart also automatically.Actually, when server is rebooted, the instance is started but the HADR starts to be desynchronized.
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.Therefor...
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...
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.
We had a Db2 load job run that used a load control dataset with 1,764 “INTO TABLE” statements run against a database that had one tablespace with 1,366 tables having 1,306 indexes. The DBD length = 2628728.
When the job was run, the SYSDBDXA ...
Tablespace reports rollforward pending after an HADR takeover report success
Banco do Brasil built a DR site and deployed a DB2 Purescale with HADR between these sites.HADR is in peer state. Then customer perform a takeover to switch HADR roles between sites.After the takeover finished successfully we tried to activate the...
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