I have worked with Oracle databases for around 25 years now and during that time I have been very fortunate in that there has always been work for DBAs and it has been one of the higher paying disciplines within IT.
I am not prophesying the end of the Oracle database engine but I do see the writing on the wall for some of the large corporate solutions sitting on physical equipment in a datacentre. (more...)
If a Goldengate replicat process fails then occasionally on the restart it skips the correct RBA and ‘loses it’s position’. The relative byte address (RBA) is the location within the trail file to indicate the current transaction.
The old school method was to calculate which RBA was the correct one and then restart the replicat. However there is a new command on the block now (pun intended) and I will demonstrate how the two methods (more...)
We received the following alert from our alerting system
Flash Recovery Area for FOLPRD1A has 9.97 percent of usable space left.
This is a standby database:
HOST INSTANCE STATUS VERSION STARTED UPTIME
———- ———- ———- ———— ————————- ————————————————–
xxxxxxxx INSTANCE MOUNTED 220.127.116.11.0 18-JAN-2017 18:58:18 (more...)
Yes, very tongue in cheek. I know everyone does not celebrate Xmas.
I was still surprised though. This is what was viewed
Best wishes for 2017 to all my readers.
I was looking at the RMAN DEBUG options and came across the CHECKSYNTAX function which I had not used before.
Firstly a quick recap on the DEBUG option.
This can be called using the following syntax
rman target / catalog rman12g1/xxxx@rmancat debug trace=rmantrace.log cmdfile=backup.rcv
rman target / catalog rman12g1/xxxx@rmancat debug trace=rmantrace.log then run RMAN> @backup.rcv (or just type in your run block of commands)
There are a number of options (more...)
The Enterprise Manager AWR Warehouse is designed to hold performance data from multiple databases for long-term analysis. It promoses that it will save storage and improve performance on your production systems. In that it is indeed correct. However the warehouse itself does not seem to be performant when taking in multiple sources and retaining them long-term – 400 days in our case. Why 400 days is an obvious question that might be asked. Primarily because (more...)
I am currently interested in managing storage on our Exadata platform which is primarily used for running a data warehouse.
The ongoing challenge is that most of the large tablespaces use a bigfile datafile and we insert data using append. That causes data gaps within the datafile and it is constantly growing. A recent example showed a 7Tb datafile containing only 2Tb of data and yet the ASM diskgroups were reporting we were running out (more...)
I attempt to export a table with 76,000 rows using a relatively standard datapump command
expdp schemas=ODI_TEMP cluster=y directory=MCB content=ALL dumpfile=OEC_%U.dmp include=table:"IN('ORDM_ERROR_COUNTS')" parallel=8 logfile=OEC.log
It fails with a fatal error and also produces a warning
Connected to: Oracle Database 11g Enterprise Edition Release 18.104.22.168.0 – 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management and OLAP options
Starting “ODI_TEMP”.”SYS_EXPORT_SCHEMA_03″: odi_temp/******** schemas=ODI_TEMP cluster=y directory=MCB content=ALL dumpfile=OEC_%U.dmp (more...)
Today an application team had a problem with a production system and they wanted the database restored to a point a couple of days ago. It is a configuration management system and they figured they could lose any changes . Their call.
I did all the good things
- Checked we had a change in place
- Blacked out primary and standby in OEM
- Checked flashback was on –
select flashback_on from v$database;
Back in Nov 2015 I commented on a Oracle-L discussion about What happened to SQL*Developer SQL Formatter asking why people liked to see a comma at the beginning of the line in sql code and there was a fair bit of input into how it was easier to use and amend – think of it like bullet points was one comment.
Fair enough I though and I have used that technique when I remember ever (more...)