This topic contains setup guidelines that apply to specific Oracle datatypes. These guidelines should be addressed before you start replication for the first time.
Manage SharePlex LOB storage
The 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.
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.
For best performance when transaction volume is either very high or very low, certain parameter changes are recommended before replication starts.
To determine the correct values, refer to the following table under the column that corresponds to the daily archive log volume of your database.
Note: For environments generating between 5 GB and 15 GB of archive log volume daily, the default settings for SharePlex parameters are sufficient, and no action is needed.
To change the parameters, use the set param command in sp_ctrl. Contact Quest Technical Support if you need assistance. For more information about SharePlex parameters and commands, see the SharePlex Reference Guide.
|Parameter||Less than 5GB/day||Between 5GB and 15GB/day||Greater than 15GB/day||Where to set the parameter|
|SP_COP_IDLETIME||120||Default||600||source and target systems|
If Oracle or other processes are assigned resource priority, SharePlex can be left with a default setting and little resource allocation. Oracle increases its CPU utilization during peak processing. If SharePlex loses pace with Oracle, you can try increasing its process priority.
To set process priority on Unix
Use the nice command. Consult with the System Administrator to select an appropriate value based on the requirements of all software running on the system. A root user can modify the niceness value of any process. The SharePlex Administrator user can adjust the niceness value of SharePlex.
To set process priority on Windows
By default SharePlex replicates changes made to tables through a SQL*Loader direct-path load (DIRECT=TRUE keyword parameter). There can be only one load per table (PARALLEL=FALSE), although there can be simultaneous loads on different tables. The database must be in archive mode, and table logging must be enabled.
If you expect the direct-path load to be sustained for a long time on the source system, it might be more efficient to load the data to the target database directly, instead of relying on replication. A large direct-path load can cause Capture to lose pace with changes that enter the redo logs from user application activity.
After the load, you should disable check constraints. You can leave ON DELETE CASCADE constraints enabled.
The SP_OCT_REPLICATE_DLOAD parameter controls whether or not direct-path loads are replicated. To disable replication of direct-path loads, change this parameter to 0. For more information, see the SharePlex Reference Guide.
You can enable compression to reduce the amount of data that SharePlex sends across the network. SharePlex uses LZIP lossless compression. Enabling compression on the source SharePlex instance automatically enables compression to all targets of the source SharePlex instance.
By default compression is disabled. You can enable compression by itself or in conjunction with encryption.
To enable compression
Set the SP_XPT_ENABLE_COMPRESSION parameter to 1.
sp_ctrl> set param SP_XPT_ENABLE_COMPRESSION 1
To activate the parameter after you set it, stop and start Export.
To capture data from an Exadata system, the SP_OCT_USE_OCI parameter must be set to 1. For more information, see the parameter documentation in the SharePlex Reference Guide.
If you need to adjust capture performance after replication starts, see Tune Capture on Exadata.
When replicating Oracle Data Pump export operations, set the SP_OCT_ALLOW_DP_DDL parameter to 1, and then restart Capture.
This parameter can be enabled if SharePlex fails to replicate DDL operations that occur when running an Oracle Data Pump export/import. Occasionally, SharePlex identifies DDL in a Data Pump load as recursive DDL that should be ignored. This parameter directs SharePlex to capture that DDL.
A setting of 1 enables this parameter. After the load is finished, set this parameter back to 0 and then restart Capture.
SharePlex uses the TDE Master Encryption Key to decrypt TDE-protected data that must be replicated. SharePlex uses the Oracle wallet password to access the TDE Master Encryption Key.
If the wallet opens successfully, Capture connects to the decryption module and processes the data. If the wallet does not open, Capture remains in the initialization state until either the wallet is opened or the process is stopped. The initialization state that is displayed in the show capture command is "Capture state: Waiting for open wallet."
Note: The SharePlex copy/append command does not support TDE. For full information on the Oracle features that SharePlex supports, see the SharePlex Release Notes.
To decrypt TDE-protected data from the redo log, the SharePlex Administrator must open Oracle Wallet using the wallet password. By default, only the Oracle Wallet owner-user has read and write permissions for this file. You can either start as the owner of the wallet, or you can grant read permission to the file to the dba group, because the SharePlex Administrator user is a member of that group.
To configure SharePlex to support TDE-protected data, two setup tools must be run:
On the source system, start SharePlex from the SharePlex product directory. You are prompted to run sp_wallet.
*** To enable TDE replication, run sp_wallet and provide the wallet password ***
./sp_wallet [-r port_number]
Important! On Windows, if you installed SharePlex on any port other than the default of 2100, use the -r option to specify the port number. For example, in the following command the port number is 9400:
./sp_wallet -r 9400
wallet password: walletpw
Wallet loaded into SharePlex
To run sp_wallet in auto-open mode
If you are using an auto-open wallet, you can configure SharePlex to open the TDE wallet automatically. This eliminates the need to run sp_wallet manually at SharePlex startup. The syntax is:
./sp_wallet --auto-open [-r port_number]
Important! Using the auto-open wallet feature has additional security considerations. See the Oracle documentation for more information. In addition, do not back up the SharePlex variable-data directory together with the Oracle wallet and the Oracle data files.
To cancel auto-open mode
./sp_wallet --no-auto-open [-r port_number]
To change the TDE master encryption key
If you need to change the TDE Master Encryption Key while a SharePlex configuration is active, take the following steps to ensure that SharePlex continues to replicate the TDE-protected data after the changes.
Run the sp_wallet utility to provide SharePlex with the new TDE Master Encryption Key.
./sp_wallet [-r port_number]
This chapter contains the information that you need to know in order to create a configuration file. SharePlex takes direction from the configuration file to determine which tables to replicate and where to send the replicated data. This file also provides any special processing instructions, such as column mapping and data filtering.
The following guidelines help you ensure that the source and target objects that you want to map in a replication configuration are compatible.
Corresponding source and target rows must contain the same values unless transformation is being used.