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Oracle/Administer Oracle 9i RAC.md

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+# Administer Oracle 9i RAC
+**Need to know**:
+
+  * Database Name
+  * Instance Name
+  * pfile location
+  * Storage Method (ASM/Filesystem)
+
+
+**Use SRVCTL to verify database/instance**:
+* Obtain the status of GSD `gsdctl status`
+* First run the GSD and listener
+```
+%ORACLE_HOME%\bin\gsdctl start
+%ORACLE_HOME%\bin\lsnrctl start
+```
+* List configuration of the instance & database:
+```
+srvctl config instance
+srvctl config database
+srvctl config database -d dbname
+```
+* To list all environment variables for a database: `srvctl getenv database -d mydb`
+* List DB and instance status
+```
+srvctl status database -d database_name
+srvctl status instance -d mydb -i mydb1,mydb2
+```
+* start/stop db
+```
+srvctl start database -d mydb (-i iname - optionally)
+srvctl stop database -d mydb
+```
+
+**IF everything fails try**
+
+Start `OracleServicesid` instance on each node. `C:\> net start OracleServicesid`
+
+From the Control Panel's Services window, select `OracleServicesid`, then click `Start`.
+
+If the listener is not started, start it on each of the nodes
+```
+LSNRCTL
+LSNRCTL> start [listener_name]
+```
+
+Where `listener_name` is the name of the listener defined in the `listener.ora` file.
+
+You do not have to identify the listener if you are using the default listener named LISTENER.
+```
+sqlplus /nolog
+CONNECT SYS\password
+STARTUP PFILE=%ORACLE_HOME%\database\initsid.ora;
+```
+
+## Export the database
+
+Once the database is open, ensure that EXP_FULL_DATABASE and is assigned to DBA role
+```sql
+SELECT * FROM DBA_SYS_PRIVS;
+SELECT * FROM DBA_ROLE_PRIVS;
+```
+
+If the role does not exist then run `catproc.sql` and `catalog.sql`
+
+Ensure the SYSTEM user has the DBA role assigned
+  C:\>EXP system/manager FULL=y FILE=export.dmp
+
+SOS: IF stored procedures exists, they cannot be migrated to MySQL!!!!
+```sql
+SELECT * FROM ALL_OBJECTS WHERE OBJECT_TYPE IN ('FUNCTION','PROCEDURE','PACKAGE');
+```

Oracle/Automatic startup Oracle 10g-11g on Linux Systems.md

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+# How to auto startup Oracle 10g/11g on Linux Systems
+
+If you have installed 11g using the Grid Infrastructure (either for a single node or a RAC environment), then you do not need to worry for autostartup, as Grid Infrastructure installs a service called Oracle Restart, which does exactly that, the automatic startup of Oracle processes whenever they fail or the system reboots.
+
+If you have installed 10g or 11g (Without using the Grid Infrastructure option then you need to):
+http://www.oracle-base.com/articles/linux/AutomatingDatabaseStartupAndShutdownOnLinux.php

Oracle/Export and Import Methods.md

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+# Export and Import Methods
+
+## Export schema and import to a new tablespace on the same DB
+You cannot move the whole schema from one tablespace to another, especially if you have LOBs. What you need to do is either transfer only the data (without the LOBs), which is too much of a trouble and you may loose some information unless you are extremely careful. Or you can export the schema you want to move to another tablespace, delete the objects of that schema and import the objects to new tablespace. In order to export a schema and import it to the same database but to new tablespace you need to:
+
+* **Create the new tablespace(s)** with the appropriate datafiles. We are going to create a test tablespace with starting with 10G of space and it will be auto-extendable. The auto-extend will occur every 250M and the maximum size will be unlimited.
+```
+sql> create tablespace tablespace_name datafile 'path_to_file/filename.dbf'
+   > size 10G autoextend on next 250m maxsize unlimited extent management local;
+```
+* Create a directory on the filesystem that will hold the dump files of export/import procedure.
+```
+$ mkdir /path_to_dir/exp_dir
+```
+* Register the directory to the database and give permissions to a db user in order to be able to export/import objects.
+```
+sql> create or replace directory new_imp_dir as '/path_to_dir/exp_dir';
+sql> grant read,write on directory new_imp_dir to system;
+```
+* Check the number and the status of schema objects
+```
+sql> select object_type,status,count(*) from user_objects group by object_type,status;
+```
+* Export the schema (user) you wish.
+```
+$ expdp system/password directory=new_imp_dir dumpfile=name_of_dump_file.dmp logfile=name_of_log_file.log schemas=name_of_schema
+```
+* Delete the schema objects.

Oracle/How to check Oracle corruption.md

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+# How to check Oracle corruption
+
+(Tip given from MOS - myoracle support)
+
+
+Please check with RMAN if there are datablock corruptions :
+
+```
+% rman target /
+RMAN> run {
+allocate channel d1 type disk;
+allocate channel d2 type disk;
+backup check logical validate filesperset 10 database;
+}
+```
+
+RMAN is populating the view V$DATABASE_BLOCK_CORRUPTION with the above commands, if corrupted blocks are found
+
+Use `sqlplus` and connect as `sysdba` user `sqlplus "/ as sysdba"` and run the following queries
+```sql
+SQL> select * from v$database_block_corruption ;
+
+SQL> SELECT e.owner, e.segment_type, e.segment_name, e.partition_name, c.file#
+, greatest(e.block_id, c.block#) corr_start_block#
+, least(e.block_id+e.blocks-1, c.block#+c.blocks-1) corr_end_block#
+, least(e.block_id+e.blocks-1, c.block#+c.blocks-1)
+- greatest(e.block_id, c.block#) + 1 blocks_corrupted
+, null description
+FROM dba_extents e, v$database_block_corruption c
+WHERE e.file_id = c.file#
+AND e.block_id <= c.block# + c.blocks - 1
+AND e.block_id + e.blocks - 1 >= c.block#
+UNION
+SELECT s.owner, s.segment_type, s.segment_name, s.partition_name, c.file#
+, header_block corr_start_block#
+, header_block corr_end_block#
+, 1 blocks_corrupted
+, 'Segment Header' description
+FROM dba_segments s, v$database_block_corruption c
+WHERE s.header_file = c.file#
+AND s.header_block between c.block# and c.block# + c.blocks - 1
+UNION
+SELECT null owner, null segment_type, null segment_name, null partition_name, c.file#
+, greatest(f.block_id, c.block#) corr_start_block#
+, least(f.block_id+f.blocks-1, c.block#+c.blocks-1) corr_end_block#
+, least(f.block_id+f.blocks-1, c.block#+c.blocks-1)
+- greatest(f.block_id, c.block#) + 1 blocks_corrupted
+, 'Free Block' description
+FROM dba_free_space f, v$database_block_corruption c
+WHERE f.file_id = c.file#
+AND f.block_id <= c.block# + c.blocks - 1
+AND f.block_id + f.blocks - 1 >= c.block#
+order by file#, corr_start_block#;
+```

Oracle/How to remove a RAC installation.md

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+# How to remove a RAC installation
+
+<code>
+#rm -rf /etc/oracle
+#umount -f /u01
+#cat /etc/fstab
+#fdisk -l
+#mkfs.ext3 -L /u01 /dev/sdb1
+#mount -a
+#ls -la /u01
+#ls -la /etc
+#rm -rf /tmp/.oracle /usr/tmp/.oracle
+#vi /etc/inittab
+#rm -rf /etc/init.d/init.*
+#ps -aef|grep ora
+#rm /etc/oraInst.loc
+#cat /etc/sysconfig/rawdevices
+#dd if=/dev/zero of=/dev/sdd1
+#dd if=/dev/zero of=/dev/sde1
+#reboot
+</code>
+
+<code>
+mkdir -p /u01/crs/oracle/product/10.2.0/crs
+mkdir -p /u01/app/oracle/product/10.2.0/db_1
+mkdir -p /u01/oradata
+chown -R oracle.oinstall /u01
+</code>

Oracle/Install Oracle On CentOS Linux.md

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+# Install Oracle n CentOS Linux
+
+## Pre-installation Tasks =====
+In order to install Oracle you need to meet some minimum hardware requirements and prepare the linux kernel a bit (by creating users and groups).
+
+## Hardware Requirements
+In order to install Oracle Database 10gR2 on CentOS, your system needs to have the following requirements:
+
+  * 512 MB of RAM
+  * 1 GB swap space (or twice the size of RAM)
+  * 400 MB of disk space in the /tmp directory
+  * 1.7 GB, at least, of disk space for the Oracle software. If you want the Sample Schema Database you need at least 2.1G of disk space.
+
+## Configuring Linux
+You need to configure the system and create some groups and the oracle user. In order to create the groups you need to:
+
+  * Open a terminal and login as root
+  * Create at least the dba and oinstall group. Other groups that can be created are the oper, asmdba, asmoper, dbsnmp
+  ```
+  # groupadd oinstall
+  # groupadd dba
+  ```
+  * Create the OS user: **oracle**
+  ```
+  # useradd -g oinstall -G dba oracle
+  ```
+  * Enter a password for the oracle user you just created
+  ```
+  # passwd oracle
+  ```
+  * Change the process and file limits for oracle user by adding the following lines to /etc/security/limits.conf
+  ```
+  oracle  soft    nproc   2047
+  oracle  hard    nproc   16384
+  oracle  soft    nofile  1024
+  oracle  soft    nofile  65535
+  ```
+  * Add the following lines to /etc/pam.d/login
+  ```
+  session    required     /lib/security/pam_limits.so
+  session    required     pam_limits.so
+  ```
+  * Change the user limits for Oracle user by adding the following lines to /etc/profile
+  ```
+  if [ $USER = "oracle" ]; then
+    if [ $SHELL = "/bin/ksh" ]; then
+         ulimit -p 16384
+    else
+         ulimit -u 16384
+    fi
+  fi
+  ```
+  * Create the directories needed for the installation and change file ownerships to oracle user
+  ```
+  # mkdir -p /u01/app/oracle
+  # chown -R oracle:oinstall /u01/app
+  # chmod -R 775 /u01/app
+  ```
+  * Set the kernel parameters. Open the **/etc/sysctl.conf** file and **add** lines similar to the following values. These are the minimum values required by oracle, which means that if you have set up already those parameters higher than the values below, you need to skip that step and the one that follows.
+  ```
+  kernel.sem = 250 32000 100 128
+  kernel.shmall = 2097152
+  kernel.shmmax = 2147483648
+  kernel.shmmni = 4096
+  fs.file-max = 65536
+  net.core.rmem_default  = 262144
+  net.core.rmem_max      = 262144
+  net.core.wmem_default  = 262144
+  net.core.wmem_max      = 262144
+  net.ipv4.ip_local_port_range = 1024 65000
+  ```
+  * In order for the changes in sysctl to take effect, you need to reboot either the system or to run:
+  ```
+  # sysctl -p
+  ```
+
+## Installing Oracle Database 10.2.1.0
+  * As root run the following command:
+  ```
+  # xhost +
+  ```
+  * As Oracle user, go to the directory that you have downloaded the oracle software and run the installer.
+  ```
+  $ ./runInstaller
+  ```