SharePlex 10.0 - Installation and Setup for Oracle Source

Assign a directory to store the downloaded SharePlex installation package.

This directory requires approximately the following disk space:

• Unix and Linux: 200 MB
• Windows: 60 MB plus 400 MB of temporary disk space

It can be removed after SharePlex is installed.

Plan the SharePlex product directory.

You can create a directory for the SharePlex software files or let the SharePlex installer create it. This directory requires approximately the following disk space:

• Unix and Linux: 120 MB
• Windows: 600 MB plus 20 MB for the MKS Toolkit®

Install this directory on the following:

• Unix and Linux: a separate filesystem from the one that contains the database.
• Windows: a separate internal hard drive or partition from the one that contains the database.

Do not install SharePlex on a raw device.

Plan the SharePlex variable-data (working) directory.

This directory is installed by the SharePlex installer with a name of your choosing. It contains the working data and varies greatly in size in correlation to the volume of data being generated. Install this directory on a separate filesystem from the one that contains the database, but not on a raw device.

To estimate the required disk space:

1. Estimate the longest time that a replication outage can be tolerated.

2. Use the following formula to estimate the amount of data SharePlex would replicate during that amount of time.

   [size of a redo log] x [number of log switches per hour] x .333 x [number of hours downtime] = required disk space

   For example:

   [500 MB redo log] x [5 switches per hour] x [.333] x [8 hours] = 6.5 GB disk space

To replicate data from more than one database on a system, use a variable-data directory for each one. Ideally they should be on different filesystems.

Do not install the variable-data directory within the SharePlex product directory. Both directories contain identically named files, and SharePlex utilities that clean up the environment (if this becomes necessary) could remove the wrong files. You can install both directories under one parent directory if desired.

Note: Always monitor disk usage when there is an active SharePlex configuration, especially when there are peaks in transaction activity.

Install in a cluster (including Oracle RAC)

Most shared storage solutions can be used to house SharePlex. Such file systems include, but are not limited to:

• Oracle Cluster File System (OCFS2)
• Oracle Automatic Storage Management (ASM) Cluster File System (ACFS)
• Oracle DataBase File System (DBFS)
• OCFS2 Note: This file system must be mounted nointr. Both SharePlex and Oracle report interrupt errors if nointr is not specified.
• Most general purpose cluster file systems

See Installation and setup for Oracle cluster for SharePlex installation requirements in a cluster. Many of those steps must be performed before you install SharePlex, while others are performed after installation.

Create the SharePlex security groups.

SharePlex provides three security groups to enable access control through sp_ctrl. On Unix and Linux, unless you install SharePlex as a root user, the SharePlex Administrator user and the SharePlex admin group must exist prior to installation. For more information, see Assign SharePlex users to security groups.

Note: If you install as root, you are prompted by the installer to create these groups.

Choose a DBA-privileged operating system group to own SharePlex.

The SharePlex Administrator user must be in the Oracle dba group. For Oracle RAC and ASM 11gR2 and above, the user must also be in the Oracle Inventory group. For example: $ useradd –g spadmin –G dba,oinstall. The membership in Oracle Inventory group must be listed explicitly in the etc/group file.

Confirm that the platform is supported.

Review the SharePlex Release Notes to make certain your operating system is supported.

Allocate at least 4 GB of memory for SharePlex processes.

Plan for per-process memory up to 256 MB. This recommendation enables the Post and Read processes to allocate larger sets of memory when necessary.

Disable the disk cache option.

(Source system) Place the redo logs, archive logs, and SharePlex files on a file system that does not have a cache option. Disk caching may interfere with the capture process. For more information, see the SharePlex Knowledge Base article 30895.

Set the number of semaphores per process.

Semaphores help ensure the stability of the SharePlex processes. The required SharePlex settings depend on the platform, as follows:

Oracle Solaris:

• semmni: 70
• semmns: 255
• semmnu: 255
• semmsl: 128
• semume: 255
• shmmax: 60 MB
• shmmni: 100

Red Hat Linux:

• semmni*: 70
• semmns*: 255
• semmnu: 255
• semmsl: 128
• semopm: 64
• semume: 255
• shmmax: 60 MB
• shmmin: 1MB
• shmmni: 100

• shmseg: 26

  *These are additive. Add the database minimum values to the SharePlex minimum values to determine the correct setting.

An alternative is to set the value to the number of queues you will be using plus 2. For more information about SharePlex queues, see the SharePlex Administrator Guide.

Set the ulimit (number of system file descriptors) to as close to 1024 as possible.

The ulimit can be set either as a system hard limit or a session-based soft limit, as follows:

• Set a hard limit: (Recommended) A root user and system restart are required to change the hard limit, but the value remains fixed at the correct level to support SharePlex. Consult your System Administrator for assistance.
• Set a soft limit: A soft limit setting stays in effect only for the duration of the sp_cop session for which it was set, and then it reverts back to a default value that may be lower than the hard limit and too low for SharePlex.

Set soft and hard limits for the SharePlex user

Set a soft limit and a hard limit for nproc and nofile for the SharePlex O/S user in the /etc/security/limits.conf file.

• shareplex O/S user soft nproc 2048
• shareplex O/S user hard nproc 16384
• shareplex O/S user soft nofile 1024
• shareplex O/S user hard nofile 65536

As an alternative, you can simply use the setting for the Oracle O/S user.

Set core file parameters.

• Set the system core dump block size as large as system resources can accommodate, at minimum 1.5 million blocks. The default is usually 0. Core files help Quest support representatives resolve SharePlex support cases. Higher size settings ensure that enough data is captured to be useful.
• Set the core file output location to the dump sub-directory of the SharePlex variable-data directory.
• Set the naming convention of core files to either core or core.pid. Note: SharePlex renames all core files named core to core.pid, except for those generated by sp_cop.

If these requirements are not met, the SharePlex event log might report that a core file was not generated, even though a file exists.

Install the ksh shell.

Install the ksh shell before you install SharePlex. The SharePlex monitoring scripts and other features required this shell.

A version of ksh called pdksh is included with the Red Hat Linux builds. Refer to the Red Hat Linux documentation for more information.

Install Native POSIX Threading Library (NPTL)

Quest recommends using the Native POSIX Threading Library (NPTL) on Linux. NPTL is faster and behaves more like other Unix operating systems than LinuxThreads. Although LinuxThreads can be enabled per process by using the LD_ASSUME_KERNEL environment variable, setting that variable adversely affects the performance of SharePlex. If LD_ASSUME_KERNEL is employed, use a setting of 2.4.21.

Set the UNIX account that installs SharePlex to -rwsr-s--x using set-user-id.

The value of -rwsr-s--x enables the Database Setup utility to connect to an Oracle database through SQL*Plus to install the SharePlex database account and objects during installation. The UNIX account that installs SharePlex owns this program.

(Debian Linux)

Create a symbolic link to the /lib64/libc.so.6 library path.

On Debian Linux, the /libc.so.6 library files are not in the /lib64/libc.so.6 location that SharePlex expects. Before installing SharePlex on Debian Linux, create a symbolic link to /lib64/libc.so.6.

Confirm that the Windows version is supported.

Review the SharePlex Release Notes to make certain your operating system is supported.

Be prepared to restart the system.

On the Windows platform, SharePlex installs the MKS Toolkit® operating environment from Parametric Technology Corporation (PTC). The default folder for the MKS Toolkit® is C:\Program Files\MKS Toolkit.

Set system permissions so that the MKS Toolkit files cannot be moved or removed after they are installed.

If this is a first-time MKS Toolkit installation, you will be prompted to restart the system.

Adjust the page size.

SharePlex needs an additional 200 MB of page file size if more than 80 percent of the current total page file size is being used. Greater page size enables SharePlex to process large transactions more quickly.

Assign a user who will own the SharePlex directories.

Assign a member of the Windows Administrator group to own the SharePlex installation and variable-data directories. This user must exist before you run the SharePlex installer and must have system privileges to read the Oracle redo logs.

(Oracle) Verify the Oracle Registry entries.

(Test machines only) On machines where Oracle has been installed and uninstalled many times, the Oracle entries in the Registry may be corrupted. Before you install SharePlex on a test machine, uninstall all Oracle software and delete all Oracle Registry entries. Then, re-install Oracle by using the Oracle installation program, which creates Registry entries correctly. SharePlex relies on these entries to obtain database environment information.

Perform any required database upgrades.

Perform any required database upgrades before you install SharePlex. This ensures that SharePlex gets the most current object definitions when you run Database setup during the installation and setup steps.

Confirm the Oracle release version and processor type.

(source and target databases)

Verify that the Oracle release version is supported by SharePlex.

Note: SharePlex does not support 32-bit Oracle versions.

Set up Oracle online and archive logging.

(source databases)

• Enable archive logging to avoid the need to resynchronize data after a log wrap.
• Enable minimum supplemental logging.
• Enable supplemental logging of primary and unique keys.
• Configure the logs to support replication.

For more information, see Set up Oracle logging to support SharePlex.

Set up database objects to support replication.

Set up Oracle objects to support replication properly, including:

• Log primary and unique keys (source database only).
• Handle tables that do not have keys.
• Handle indexes, triggers, constraints, and sequences.

For more information, see Set up Oracle database objects for replication.

Configure database properties to support replication

(source databases)

Make the recommended database settings to support SharePlex processes:

• Verify character sets are compatible with SharePlex.
• Adjust log buffer size.
• Adjust open cursors and processes parameters.
• Adjust initrans setting of SHAREPLEX_TRANS table.

For more information, see Set up an Oracle database to support SharePlex.

Set privileges to capture TDE-protected data.

(source databases)

To decrypt TDE-protected data from the redo log, the SharePlex Administrator must open the Oracle Wallet with the wallet password. By default, only the Oracle Wallet owner-user has read and write permissions for this file. To enable SharePlex to open the wallet, you can either of the following:

Grant read permission to the wallet file to the dba group, because the SharePlex Administrator user is a member of that group.

Or...

Have the owner of the wallet start SharePlex.

For more information, see Set up TDE Support.

Plan the SharePlex Oracle account.

(source and target databases)

During SharePlex installation, you will run the Database Setup utility to create a database account (user and schema) for SharePlex. The following is a list of privileges required for the database user who runs the this utility:

Non-multitenant (standard) database

The user who runs the setup utility must have DBA privileges.

Multitenant database

The user who runs the setup utility should have SYSDBA privileges (recommended), but at minimum the user should be a DBA user with privileges for sys.users$ and sys.enc$. The minimum following grants are required for the SharePlex user:

create user c##sp_admin identified by sp_admin;

grant dba to c##sp_admin container=ALL;

grant select on sys.user$ to c##sp_admin with grant option container=ALL;

Plan the SharePlex objects tablespace.

(source and target databases)

The Database Setup utility installs some tables into a tablespace of your choosing. All but the SHAREPLEX_LOBMAP table use the default storage settings of the tablespace.

The SHAREPLEX_LOBMAP table contains entries for LOBs stored out-of-row. It is created with a 1 MB INITIAL extent, 1 MB NEXT extent, and PCTINCREASE of 10. The MAXEXTENTS is 120, allowing the table to grow to 120 MB.

Preferred action: If you enable supplemental logging for primary and unique keys, you can set the SP_OCT_ENABLE_LOBMAP parameter to 0, and nothing will be stored in the SHAREPLEX_LOBMAP table. In this case, you do not have to consider its size growth. It is recommended that you enable supplemental logging for primary and unique keys to maximize the performance of the Read process.

Alternate action: The default storage usually is sufficient for SHAREPLEX_LOBMAP, permitting more than 4 million LOB entries. If the Oracle tables to be replicated have numerous LOB columns that are inserted or updated frequently, consider increasing the size the SharePlex tablespace accordingly. Take into account that this table shares the tablespace with other SharePlex tables.

If the database uses the cost-based optimizer (CBO) and the tables that SharePlex processes include numerous LOBs, incorporate the SHAREPLEX_LOBMAP table into the analysis schedule.

Note: A new installation of SharePlex does not change storage parameters from a previous installation.

Plan the SharePlex temporary tablespace.

(source and target databases)

The Database Setup utility prompts for a temporary tablespace for SharePlex to use for sorts and other operations, including sorts performed by the compare commands. The default temporary tablespace is the one where the SharePlex objects are installed. If you plan to use the compare commands to compare large tables, especially those without a primary or unique key, specify a dedicated temporary tablespace for SharePlex.

Plan for theSharePlex index tablespace.

(source and target databases)

The Database Setup utility prompts for a tablespace to store the indexes for the SharePlex tables. The default index tablespace is the one where the SharePlex objects are installed. To minimize I/O contention, specify a different index tablespace from the one where the tables are installed.

Note: If indexes from a previous version of SharePlex are installed in the SharePlex objects tablespace, you can move them to a different tablespace and then specify that tablespace when you run the setup utility.

Plan for required queue space

SharePlex stores replicated data that is being processed in queues on the local system. There must be enough disk space for these queues to grow in the event that a SharePlex process stops (for example, a target system is down) and replicated data accumulates in the queues.

To determine the amount of queue space on each system

1. Use a worst-case scenario and estimate the length of downtime to be tolerated.

2. Determine how much data is replicated in that time, using the following formula as a guide. This formula multiplies the redo log value by one-third because only about one-third of the redo log is actually data that is replicated. The rest is data used by Oracle to maintain and operate the instance itself.

   [size of a redo log x number of log switches in 1 hour] x 1/3 x [number of hours downtime] = amount of disk space needed for the queues on each system

Example:

Suppose you expect to recover from 8 hours of downtime and your redo logs are 60 MB. They switch five times an hour. According to the formula, you need 800 MB of space on the source machine and on the target machine for the SharePlex queues.

[60 MB redo log] x [5 switches/hour] x [1/3] x [8 hours] = 800 MB disk space

Install the Oracle client.

(on-premises databases)

The Oracle client libraries are needed both for installation and setup as well as for the operation of SharePlex.