Learn How to Download and Configure Oracle Database 12c for Linux
Oracle Linux 7 is a production release, but Oracle Database 12c is only supported on it from (12.1.0.2) onward. This installation should not be used for a real system when using 12c database versions prior to 12.1.0.2.
download 12c database for linux
You can download it using wget. But you need AuthParam along with the zip URL. You can simply do the same using Internet Explorer. Read the full article here: -base/downloading-oracle-12c-using-linux-wget/?unapproved=353&moderation-hash=41dde518defdb8e225ffed9c81fb83da#comment-353
When creating a database on Linux Container, Database Configuration Assistant (DBCA) incorrectly shows the available memory of the host server instead of the Linux Container on the Specify Configuration Options page. When you choose to allocate the percentage of memory based on the value shown, the database creation may fail in the case where total consumable memory for that Linux Container is less than the allocated memory.
Did any one download and successfully install oracle database 12c for linux x86_64 on "intel processor machine"? as i can see the downloadable media file names depicts that it is only for AMD processor machines.. see below snapshot:
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I am trying to install Oracle 12c on Oracle Linux 8. I have the relevant files (linuxamd64_12102_database_1of2 and linuxamd64_12102_database_2of2), but the installer uses a GUI, which I can't do (I only have console access to the server).The server is locked down so that I don't have internet / yum repository access.
I just need a simple, single-database installation - nothing complex. Can someone provide instructions for an offline, console installation of Oracle 12c with all required prerequisites? I can copy files to/from the server over ssh (so I can get files from the internet indirectly)
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IT organizations face challenges of optimizing Oracle database environments to keep up with the ever increasing workload demands and evolving security risks. This reference architecture provides a step-by-step deployment procedure with the latest best practices to install and configure an Oracle Database 12c Release 2 with Oracle Automatic Storage Management (ASM). It is suited for system, storage, and database administrators deploying Oracle Database 12c Release 2 on Red Hat Enterprise Linux 7. It is intended to provide a Red Hat Oracle reference architecture that focuses on the following tasks:
Starting with Oracle 11g Release 2 version 11.2.0.3, SELinux is supported for Oracle database environments. The system in this reference environment runs with SELinux enabled and set to ENFORCING mode.
Likewise, if a particular database client with an IP address of 10.19.142.54 required access to the web-based EM Express that uses the default port of 5500, the following firewall rich rule must be added using the firewall-cmd command.
Since Red Hat Enterprise Linux 6.4, setting swappiness to 0 will even more aggressively avoid swapping out which increases the risk of out-of-memory (OOM) killing under strong memory and I/O pressure. To achieve the same behavior of swappiness as previous versions of Red Hat Enterprise Linux 6.4 in which the recommendation was to set swappiness to 0, set swappiness to the value between 1 and 20. The recommendation of swappiness for Red Hat Enterprise Linux 6.4 or higher running Oracle databases is now a value between 1-20.
Starting with Red Hat Enterprise Linux 7.1 and above, SHMMAX default value is set to 18446744073692774399 bytes, equivalent to roughly 18 petabytes. Due to this, there is no need to calculate SHMMAX because of the very large size already provided. It is recommended to use the value set in Red Hat Enterprise Linux 7.1 and above because the value is purposely set higher than the architectural memory limits to ensure that any Oracle SGA value set within an Oracle database instance may fit in one single shared memory segment.
For example, say our environment consists of two Oracle instances with the PROCESSES set to 300 for database one and 600 for database two. With SEMMSL set at 250 (default), the first database requires 2 sets. The first set is 250 semaphores but an additional 50 semaphores is required thus an additional SEMMSL set is required thus wasting 200 semaphores. Our 2nd instance requires 3 sets, set one 250 semaphores, set two 250 semaphores, giving us a total of 500, but an additional 100 semaphores is required thus adding an additional SEMMSSL set wasting 150 semaphores. A better value of SEMMSL in this particular case would be 150. With SEMMSL set at 150, the first database requires two sets (wasting zero semaphores), our second instance requires four sets (wasting zero semaphores). This is an ideal example, and most likely some semaphore wastage is expected and okay as semaphores in general consume small amounts of memory. As more databases are created in an environment, these calculations may get complicated. In the end, the goal is to limit semaphore waste.
Oracle requires 2x value of PROCESSES in the init.ora parameter for semaphores (SEMMNS value) on startup of the database, then half of those semaphores are released. To properly size SEMMNS, one must know the sum of all PROCESSES set across all instances on the host. SEMMNS should best be set higher than SEMMNI*SEMMSL value (this is how we get 32000 for default value 250*128)
The kernel parameter FS.FILE-MAX sets the maximum number of open file handles assigned to the Red Hat Enterprise Linux 7 operating system. Oracle recommends that for each Oracle database instance found within a system, allocate 512*PROCESSSES in addition to the open file handles already assigned to the Red Hat Enterprise Linux 7 operating system. PROCESSES within a database instance refers to the maximum number of processes that can be concurrently connected to the Oracle database by the oracle user. The default value for PROCESSES is 2560 for Oracle Database 12c Release 2. To properly calculate the FS.FILE-MAX for a system, first identify the current FS.FILE-MAX allocated to the system via the following command:
To determine the current PROCESSES value, log into each Oracle database instance and run the following command below. Since no Oracle database has yet been created within this reference environment, the default value of 2560 PROCESSES is used.
Due to Bug 1597142116, the soft limit of nproc is not adjusted at runtime by the Oracle database. Due to this, if the nproc limit is reached, the Oracle database may become unstable and not be able to fork additional processes. A high enough value for the maximum number of concurrent threads for the given workload must be set, or use the hard limit value of 16384 as done above if in doubt.
While the ulimit values can be set directly within the /etc/profile file, it is recommended to create a custom shell script within /etc/profile.d instead. The oracle-grid.sh script can be downloaded from the Appendix I, Configuration Files
In order to simplify the tuning process for Oracle databases, the creation of a custom oracle profile labeled tuned-profiles-oracle resides in the rhel-7-server-optional-rpms repository. The tuned-profiles-oracle profile uses the throughput performance profile as its foundation and additionally sets all the different parameters mentioned in previous sections of this reference architecture and disables Transparent HugePages (THP) for Oracle databases workload environments.
With the introduction to Oracle Database 12c, Oracle introduced the Multitenant architecture. The Multitenant architecture provides the ability to consolidate multiple databases known as pluggable databases (PDBs) into a single container database (CDB). It provides advantages11 that include easier management and monitoring of the physical database, fewer patches and upgrades, performance metrics consolidated into one CDB, and sizing one SGA instead of multiple SGAs. While using the Multitenant architecture is optional, this reference architecture focuses on describing the step-by-step procedure of taking advantage of it. When creating an Oracle database, the recommended method is the usage of the dbca utility. Prior to getting into to the details of installing a container database (CDB) and deploying pluggable databases (PDB), an overview of the key concepts of the Multitenant Architecture is provided.