RAC: tips&tricks


In this article I will show how to change IP address of cluster interconnect. First we have to define new address of the cluster interconnect before we change network settings. And now stop all cluster resources on both nodes Now we can change cluster interconnect ips Now we can start init cluster resources on both […]

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RAC: tips&tricks

RAC: change IPs on public network

In this article I will show how to reconfigure IP addresses in public network for RAC. ` First we have to close all cluster resources This command can hang on stopping ASM. It’s normal, because the resource CRSD is using OCR, which is located on ASM diskgroup. In ASM alertlog you will see errors like: […]

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RAC: tpis&tricks

RAC: migrate standalone database to RAC

Procedure to convert a standalone database to RAC 11gR2 I have a single-instance database and I want to convert it to RAC with minimum downtime. The first step is to enable RAC option by recompiling the binaries (YOU HAVE TO STOP THE DATABASE FIRST!!!) After this operation I can startup instance and proceed to migration. […]

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RAC tpis&tricks

RAC: add new node to cluster

Add a new node to RAC Check the network configuration for both nodes On the with active cluster, check the network configuration Configure appropriate network devices on the node, which I want to add Create appropriate user on the new node: Configure shared storage – first install ASMLib drivers (if you are using ASMLib :)) […]

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RAC tips&tricks

RAC: change the voting disk and ocr location

Change VOTE and OCR location First we have to create new ASMLib binding Then we have to create new ASM diskgroup and set the appropriate attributes (at least ‘compatible.asm’) Then we can add a new location for OCR. And remove the old location Now we can replace the voting disk location

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12c & ENDIAN

12c RMAN: convert between endian formats

There is a great new feature related to the 12c database. The feature that will resolve a lot of problems with migrating databases between endian formats. And thanks to our new partner – Omnitec, who agreed to share with their SPARC resources – I will be able to demonstrate you this powerful solution. Oracle has […]

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Oracle on Solaris (SPARC)

Since the documentation to install Oracle Database on the Solaris SPARC 64bit is so lame, I wrote the short step-by-step instruction on how to install the database, using response file. I assume, that the network is configured and all appropriate packages are installed, so let’s start with configuring project and kernel parameter for user oracle: […]

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Oracle ASM

There is some kind of wrong understanding, regarding what Oracle ASM really is. A lot of people thinks, that this is some kind of file system, provided by Oracle and that Oracle Database reads data "from ASM", while the truth is, that the database reads data directly from the physical raw device with assistance of […]

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Oracle 11g & 12c: tunning the sort and hash operations

Hash and sort operations are perfomed in PGA. Quoting after the documentation: A sort operator uses a work area (the sort area) to perform the in-memory sorting of a set of rows. Similarly, a hash-join operator uses a work area (the hash area) to build a hash table from its left input. If the work […]

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Script for metadata export in SQL*Plus

Sometimes you have to export all metadata for a schema but you have no access to data pump or other tools. SQL Developer can cause a lot of problems with referential constraints. But there is always a good old SQL*Plus 🙂 http://ora-600.pl/oinstall/metadata.sql

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Oracle RAC – add another ethernet to interconnect

Instead of bonding you can use Oracle cluster interconnect HAIP for using multiple ethernets. And here is how its done 🙂 At the begining I have one interconnect – eth1: To add another one (eth3), I will use an oifcfg tool: Now the restart of the CRS on all nodes is required for changes to […]

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Exadata – skgxpinfo returns UDP after reconfiguration

We had to change the hostnames on Exadata with one of the customers. It is a well known fact that RAC doesn’t like such changes – we had to reconfigure the cluster and after the whole process I found the funny thing: So let’s try to turn RDS on 🙂 After shutting down all cluster […]

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SQL For Modeling

Do you realy know SQL? I mean Oracle SQL…. Maybe you should take a closer look: http://ora-600.pl/art/sql-for-modeling.pdf

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