Oracle Database Gateways 11g R2 (11.2) Installation and Configuration for heterogeneous connection from Oracle to Microsoft SQL database
Install the Oracle Database Gateways 11g R2 (11.2). See the screen snapshots of the installation here.
- During the installation, the following default initialization parameter file is created:
dg4msql = Database gateway for Microsoft SQL Server. If you choose a different database option, (more...)
- New (more...)
Attention all data modellers - we are pleased to announce the release of SQL Developer Data Modeler 3.3. This release includes a new search, reports can be generated from search results, extended Excel import and export capabilities and more control and flexibility in generating your (more...)
Merge JoinsIn order to appreciate why the execution plan encountered is unexpected, first a quick summary about (more...)
Outer JoinsThe first one is about outer joins with an extreme data distribution. Consider the following data setup:
create table t1
rownum as id
, rpad('x', 100) as filler
, case when rownum > (more...)
See the blog post over at Oracle for details, and be sure to send Christopher Jones an email (via the address in his post) stating you're an active user of the client. As Christopher mentions in his post,
You can really help us justify resources for the OS X bundle if you email me letting me know you are a fan. Since Instant Client is a free download, it is tricky for us to know how widely it gets used.
Original Post can be viewed at 11.2 AQ – Messages stuck in PROCESESED,WAIT State
I had been working today on AQ issue where messages were not moving from WAIT to READY State.This was on 188.8.131.52 database running on RHEL5u6(64 bit). I thought of quickly documenting it for easy reference When you enqueue record, you can specify delay after which record should be ready for dequeue. During this time, MSG_STATE [...]
Original Post can be viewed at Using SQL commands on ADRCI
While working with ADRCI , I came to know that we can run normal SQL commands for some of the operation.e.g To display current purge policy , you can run select * from adr_control instead of show control. adrci> desc ADR_CONTROL Name Type NULL? ----------------------------- --------------- ----------- ADRID number SHORTP_POLICY number LONGP_POLICY number LAST_MOD_TIME timestamp [...]
[I originally posted this over at the Pythian blog. If you're not following it, you should! Way more content, by far smarter people than lil ol' me.]
After reviewing my blog post about running EBS OVM templates in VirtualBox, two of my teammates suggested that I work on something with potentially broader appeal. Their basic message was, "This is really cool for us EBS nerds, but what about the Core DBAs?"
So how does "11gR2 RAC in an hour" sound? In this post, I'll demonstrate how to deploy the pre-built Oracle VM templates to create a two-node (more...)
Original Post can be viewed at Limiting I/O and CPU resources using 11g Oracle Resource Manager
Recently I was working on using Oracle DBMS_RESOURCE_MANAGER to limit resources usage by read-only queries. This was required to prevent long running ad-hoc and poorly written queries.Instead of writing custom sql /script to kill long running session, we decided to utilize Oracle Database Resource Manager. We decided using elapsed_time as criteria for cancelling sql.But during [...]
Original Post can be viewed at ORA-12514 due to DNS issue
A User reported ORA-12514 error from JDBC application connecting to RAC database ORA-12514: TNS:listener does not currently know of service requested in connect descriptor To troubleshoot it, a)I checked following things to ensure specified service is running srvctl status service -d dbname -s serv_name b) Ensured service is registered with listener lsnrctl status Note that [...]
Original Post can be viewed at Sqlplus HTML reports
I was working on setting up monitoring for application team to monitor AQ and wanted html formatting of table data. On searching I found this link from Ittichai Chammavanijakul which makes use of css formatting to generate good visual reports. EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO 7369 SMITH CLERK 7902 17-DEC-1980 00:00:00 800 [...]
Original Post can be viewed at 11gR2:Oracle Online Patching
Online patching is new feature introduced in 184.108.40.206 and oracle started delivering patches with 220.127.116.11. This patch allows you to apply patch to live database i.e we do not need to shutdown database. This feature is only available for RDBMS home and can be installed/enabled using opatch. RDBMS Online Patching Aka Hot Patching [ID 761111.1] [...]
Gone are the day when cleartext passwords had to be stored in scripts for Oracle database access. The solution to this requirement is “Oracle Secure External Password Store (SEPS)”. This article will give a short introduction and a practical example of the solution.
no Advanced Security Option (License) necessary
every unix-account, who has access to the wallet can use it to log on to the contained databases without a password! Therefore prevent other unix-accounts from accessing your wallet! (chmod, chown)
Oracle Client: Unix-Account, who wishes to connect to the database without providing a password needs to (more...)
In case you have not heard all the buzz about the Oracle SCN flaw, which was published by Infoworld after the release of January CPU, I summarize the essentials.
- There is a risk that the SCN reaches it´s maximum value and this could lead to an outage of the database.
- There is a bug in “ALTER DATABASE BEGIN BACKUP”, which increases the SCN dramatically. (Bug 12371955 – fixed in 18.104.22.168.4 and others)
- When you query a remote database via database link from a database with elevated SCN, the remote SCN gets increased to the higher value (more...)
When you have multiple Oracle APEX environments, e.g., development, test, UAT and production, and for multiple groups, one of the confusing things is that sometimes developers are lost on which environment they’re working on. Most of technically proficient developers can make a distinction easily from the URLs they’re currently using. However, most of less technically proficient (e.g., business users) sometimes cannot.
A quick and simple solution here is to make a visual distinction on the APEX workspace pages especially on the logo area. Instead of using plain vanilla logo images, they are replaced with more distinct (more...)