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SharePlex 11.4 - Administration Guide

About this Guide Conventions used in this guide Revision History Overview of SharePlex Run SharePlex Run multiple instances of SharePlex Execute commands in sp_ctrl Set SharePlex parameters Configure data replication Configure replication to and from a container database Configure named queues Configure partitioned replication Configure replication to a change history target Configure a replication strategy Configure DDL replication Configure error handling Configure data transformation Configure security features Assign SharePlex users to security groups Start replication on your production systems Monitor SharePlex Prevent and solve replication problems Repair out-of-sync data Tune the Capture process Tune the Post process Recover replication after Oracle failover Make changes to an active replication environment Apply an Oracle application patch or upgrade Back up Oracle data on the source or target Troubleshooting Tips Appendix A: Peer-To-Peer Diagram Appendix B: SharePlex environment variables

Solve activation problems

This section reviews problems and solutions that may be associated with the activation of a configuration file.

If the issue you are experiencing is not listed in this documentation, search the SharePlex Knowledge Base at:

https://support.quest.com.

The Knowledge Base provides filtering options and links to other resources that can help you use and troubleshoot SharePlex.

Note: Many configuration problems can be prevented by using the verify config command in sp_ctrl before you activate a configuration or reactivate one containing new or changed objects. The verify config command reviews the configuration to help ensure that basic requirements for activation and replication have been satisfied. See theSharePlex Reference Guide for more information.

SharePlex cannot locate the configuration file

If SharePlex cannot locate the configuration file that you want to activate, verify its location. Configuration files must reside in the config sub-directory of the SharePlex variable-data directory for activation to succeed. The create config command in sp_ctrl automatically puts configuration files in that directory. It is possible someone moved it.

Problems also occur if the configuration file was created without using the create config command. This can happen if the file was created directly through the operating system or if the config.sql or build_config.sql script was used to create it. If the working directory at the time was not the config sub-directory, or if the file was saved to a different directory, the activation will not find it.

Solution: Move the configuration file to the config sub-directory of the SharePlex variable-data directory.

Some objects failed to activate

If SharePlex cannot activate one or more objects listed in the configuration file, it will continue to activate the other ones and display the names of the ones that failed in the ID_oconf##.log file.

The following are reasons why individual objects fail to activate.

Problem Description Solution
Invalid objects

You may be trying to replicate objects that are not supported by SharePlex.

To understand the objects and operations that SharePlex supports, see the SharePlex Release Notes that accompany this release.

Invalid target systems

SharePlex could not get routing information.

Verify the names of the targets, and fix any syntax errors in the routing map. For some databases you specify an instance name, while for others you specify the actual database name.

For routing instructions, see:

After your fix the routing syntax, activate the affected configuration again.

Syntax errors and misspelled words

Misspelled names, object names specified without an owner name, and other improper syntax in the configuration specification can cause activation of an object to fail.

 Run the verify config command to view the errors. For help with configuration syntax, see Configure SharePlex to Replicate Data.
(Oracle) SharePlex cannot lock tables

If activation cannot lock the tables in the configuration file, activation of that table will fail.

Assign the SharePlex database user the privilege to lock tables.

Activation failed completely

There are several things can cause the entire activation of a configuration to fail. Common error messages for configuration activation problems are:

Bad configuration file

The Oracle sid SID specified in the config file is invalid.

The following are causes and solutions for activation failures.

Problem Description Solution
Password problems

If SharePlex is having trouble connecting to the source database and you know the SharePlex account exists, find out if someone changed the password.

Update the connection information. For more information, see Change the SharePlex Database Account.
Deactivation followed too closely by activation

In rare cases, if you activate a configuration too soon after a deactivation, the activation fails.

 Before you activate a new configuration after deactivating one, wait until you see the following message in the Event Log: Notice: sp_ordr (for o.ora10 queue o.ora10) Deactivated.

No datasource specification

The datasource specification is wrong or incomplete. An error similar to the following is returned:

The datasource specified in the config file is invalid.

Specify as:

Datasource:o.SID

(Oracle) Incorrect ORACLE_SID The wrong ORACLE_SID is specified on the Datasource:o.SID line.

Edit the configuration file to specify the correct ORACLE_SID.

How to find the ORACLE_SID and ORACLE_HOME.

(Oracle)Insufficient PROCESSES setting

If Oracle Error 20 (ORA-00020 maximum number of processes (string) exceeded) is the cause of an activation failure, it is because Oracle ran out of resources on the source system to allow one or more threads to log on.

 Increase the PROCESSES parameter in Oracle or decrease the number of activation threads that you are using. The number of threads is controlled by the threads option of the activate config command.

(Oracle) ORA-00942: table or view does not exist.

SharePlex cannot access the Data Dictionary.

 Make certain that the O7_DICTIONARY_ACCESSIBILITY parameter in the init.ora file is set to TRUE. (This is the default.) The database must be restarted if the parameter is changed.
The reconcile command is slow to complete

This applies to activation and reconcile of an Oracle source. If you issue the reconcile command when source database activity is low, the command process can, in some circumstances, seem to stall. This happens because the reconcile command is dependent on data continuing to arrive from the source system. If there is no replicated activity on the source system after the point of the hot backup or copy, the reconcile process waits until source activity resumes. This is normal.

Common activation errors

The following are common error messages that you might encounter when activating a configuration.

ACTIVATE CONFIG error messages Cause Solution
line n, source object name (T_HFL_1) not of form OWNER.TABLE The owner name may be missing from one or more objects listed in the configuration file. Specify object names as ownername.objectname.
syntax error in line n. There is a syntax error on the specified line of the configuration file. Fix the incorrect syntax. For more information, see Configure SharePlex to Replicate Data.
line n, bad routing spec (o.ora10) There is a syntax error in the routing map. Make sure the routing map is written correctly. For more information, see Routing Specifications in a Configuration File.
File does not exist. SharePlex cannot find the configuration file. Issue the list config command. If the file you want to activate is not listed, it may not be in the config sub-directory of the variable-data directory. Find the file and move it to that directory, then issue the activate config command again.
Attempt to run sp_conf when sp_conf is already active The configuration is already in the process of being activated. None required.
Login parameters not set... A SharePlex account and internal tables do not exist in the source database. Run the Database Setup utility. For more information, see Database Setup Utilities in the SharePlex Reference Guide.
WARNING, not all objects activated successfully. Check activation log. One or more tables failed to activate. For more information, see Some objects failed to activate.
Deactivate/flush a nonactive datasource You are attempting to deactivate a configuration that is not active. No action is necessary if this is the configuration that you wanted to deactivate. To see a list of configurations, use the list config command.
(Oracle) Currently involved in transaction. Objects in the configuration file are locked. SharePlex cannot lock Oracle tables to analyze them if another process has them locked. If the locks are from source transaction activity, try activating at a time when the database is less busy.

Solve replication problems

Solve Replication Problems

This section reviews common problems that you could encounter while data is being replicated.

If the issue you are experiencing is not listed in this documentation, search the SharePlex Knowledge Base at:

https://support.quest.com.

The Knowledge Base provides filtering options and links to other resources that can help you use and troubleshoot SharePlex.

General issues

Problem Description Solution
Network problems

Network factors can cause data to transfer to a target system too slowly, or not at all.

 Make certain that all Export and Import processes are running, and ask the network administrator to check the network for causes of slowdowns.
Parameter settings

Some SharePlex parameters, when changed from their default settings, can inhibit replication performance.

To determine if any parameter settings are responsible for reduced performance, issue the list param modified command to view parameters that have non-default settings. Review the documentation for those parameters in the SharePlex Reference Guide to determine whether a particular setting is affecting replication speed.

Oracle Capture-related issues

If Capture is stopped, issue the status command in sp_ctrl to verify whether or not it was stopped intentionally by an authorized SharePlex user. If it was, find out why and make certain that it is not stopped for too long.

The following are other reasons why Capture could slow down or stop unexpectedly.

Problem Description Solution
Excessive chaining

Excessive chaining reduces the performance of the source database because Oracle must read multiple blocks for a single row. Excessive chaining reduces Post performance on the target system because block fragmentation in the database decreases the speed at which Post can apply SQL statements.

Reorganize chained tables.
Ineffective redo log configuration

Capture reads archive logs if the redo logs wrap before Capture is finished with them, but this can slow down replication and consume disk space. In most cases, the redo logs should be configured so that SharePlex can avoid using the archive logs.

For more information about how to set up the logs, see the SharePlex Installation and Setup Guide.

SharePlex has low process priority

If Capture, Read, or both slow down during hot backups or other Oracle-intensive operations, view the process-priority settings on the system to determine if SharePlex can be assigned more resources.

Ideally, the SharePlex priority should match Oracle's priority.

Keys are not being logged

If PK/UK logging is not enabled for the tables in replication, SharePlex must query the database to get the key values for update and delete operations.

Enable PK/UK logging.

Temporary tables and FND tables Temp tables receive numerous changes that cause replication overhead and performance degradation. Remove temporary tables from replication.
archive logs not available

When Capture detects a log wrap and the archive logs are not available, Capture stops and returns a “Log wrap detected” error. It waits a certain amount of time and then starts again, continuing this process until the logs are restored.

Restore the archive logs from the one that Capture last processed or point SharePlex to their location with the SP_OCT_ARCH_LOC parameter. To determine the log that Capture needs, use the show capture command with the detail option. For more information, see How to Restore Oracle Archive Logs .

Compressed archive logs

Capture cannot read compressed archive logs.

Uncompress the current log that Capture needs and all those after it so that Capture can process them. To determine the log that Capture needs, use the show capture command with the detail option.

archive logs in unexpected location

Capture stops if it cannot locate the archive logs it needs. When the redo logs wrap, Capture looks for the archives in Oracle’s archive-log list, and if the logs are not there, Capture looks in the location specified by the SP_OCT_ARCH_LOC parameter.

If you are storing the archive logs in a location other than the normal Oracle location, make sure this parameter is set to the full path name of the directory containing the archive logs.

No access to the redo logs

Capture stops when it cannot read or find the logs, then it tries to read the log again.

Find out if someone changed permissions such that SharePlex does not have permission to read the redo logs.

No access to the variable-data directory

Capture stops if it is unable to write to the SharePlex logs because of restrictive permissions on the state sub-directory in the variable-data directory, or if there are space restrictions in that directory.

Verify the permissions and space for the variable-data directory.

Oracle Post-related issues

There are a number of things that cause the Post process to slow down. SharePlex generates the operation taking too long message when Post exceeds the internally controlled allowable wait time to apply a SQL statement to the target instance. Often it only takes one table to cause a bottleneck. Use the show sql or show post command to find out which table Post is processing, and then check for the following.

Problem Description Solution
Full table scans

If a target table does not have a key, Post must perform a full table scan to find the correct row. This slows the Post process.

 Do one of the following:
Bitmap indexes on target tables

Bitmap indexes are beneficial for queries, but they slow down the DML operations applied by Post.

Avoid using bitmap indexes on target tables in replication, or only use them on tables that do not have frequent DML activity.

Disk I/O bottleneck

Disk I/O bottlenecks on the target system are a common cause of slow Post performance. Post can spend a high percentage of its time waiting for Oracle to commit data. The effect is worse when there is a Capture process reading from the same log device in peer-to-peer replication.

Disk I/O is the nature of the database environment, but you can reduce the bottleneck by placing the redo logs on faster hard drives or on a solid-state drive.

High number of buffer gets

Review any table with SQL statements that cause a high number of buffer gets. There should only be two to four buffer gets on an index, depending on its size and whether or not it is a unique index.

If there are more buffer gets than four, the index probably needs to be rebuilt. You can rebuild an index without the need to reactivate the configuration file.
Oracle write-rate bottlenecks

By default, one buffer writer writes all dirty Oracle blocks to disk. Whenever that buffer writer process wakes up to write, it locks portions of shared memory and, in effect, blocks the processes that are either modifying or reading data blocks — including the Post process.

If this is a constant problem, you can consider increasing the number of writers. See the database documentation.

Small transaction size

Normally, Post performs an internal read/release after it receives each COMMIT, which means it purges that data from the queue as part of the checkpoint recovery process. For smaller transactions, this can cause excessive I/O on the target system and hinder the Post process.

If most of your transactions are small, try changing the value of the Post SP_OPO_READRELEASE_INTERVAL parameter. See theSharePlex Reference Guide for more information about this parameter.

Sequences not cached

If the sequences in replication are not cached, they add unnecessarily to the replication volume.

Cache sequences. If replicated sequences are part of a key, replicate the tables that contain those keys, and remove the sequences from the replication configuration. You should see significant performance improvement.

Low ulimit

An error similar to the following means that the system file descriptors setting on the target system needs to be increased:

Error 07-24-08 12:11:40.360226 8693 12345 Poster error: /var/quest/ vardir/log/event_log: Too many open files (posting from ora102, queue prodsys, to ora10b)

Solution: Set the ulimit as close to the optimal value of 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.
Compare process locks

The repair command locks all rows that need repair, or the entire table if there are more than 1000 out-of-sync rows, throughout the repair process. This could block Post if Post tries to apply data to the table being repaired.

If you do not want Post to wait for a repair process to finish, you can kill the compare process. To avoid issues with locks caused by repair processes, consider running the repairs during non-peak hours.

Difference in Capture and Post speed

SharePlex reads and processes records from the redo logs faster than it can post those operations to the target database with standard SQL statements.

For more information, see Tune the Post Process.

Full archive log directory

If Post appears stalled and will not shut down normally, but the only error in the Event Log is sp_opst_mt - operation taking too long, it could be that the archived log directory on the target system is full. If so, then Oracle cannot create new logs, and it suspends processing. Post stalls because it is waiting for Oracle.

Move some of the old archive logs to another device, or delete them to make room for new ones.

Commit reduction issues

If commit reduction is not working, it may be because records are not being dispatched quickly enough for there to be a valid message available after the commit. If a valid message is found after the commit message, then Post can skip the commit. Otherwise it issues the commit.

One way to find out if this is the issue is to stop the Post process completely, run a large amount of small transactions through replication, then start the Post process. If you do not see any commit reduction, then this would rule out this issue as the cause.

Post stopped

If Post stops, issue the status command in sp_ctrl to find out why.

• An idle status means there is no data in the post queue to post.

• A stopped by user status means that a SharePlex user stopped the Post process. To find out which user is responsible, view the user issued commands in the Event Log.

• A stopped due to error status means a replication or database error caused Post to stop.

The following are some potential causes for Post to stop unexpectedly.

Problem Description Solution
Correctable database errors

Post stops for database errors that can be corrected, so that you can fix the problem without risk of the data going out of synchronization. The errors and the faulty SQL statement are logged to the databaseID_errlog.sql file in the log sub-directory of the variable-data directory on the target system.

Use the information in the log file to correct the problem, then start Post again. Posting resumes from the point where it stopped.

Non-correctable database errors

Some database errors, such as out-of-sync conditions, cannot be corrected. In that case, SharePlex reports the error to the Event Log, writes the error and SQL statement to the databaseID_errlog.sql file, and continues processing. Sometimes, errors that cannot be corrected cause Post to stop.

If the errors cannot be corrected but you want Post to continue processing, list the errors in the in the databasemsglist file and then set the SP_OPO_CONT_ON_ERR or SP_OPX_CONT_ON_ERR parameter to 1, which directs SharePlex to ignore those errors and continue posting. For more information, see Continue to Post When there is a DML Error.

Locks on target tables

If a target table is locked, the Post process cannot apply a SQL statement and generates an error message. This message could mean that a user, application, or job is accessing the table and might have caused an out-of-sync condition. Or, for an Oracle target, it could mean that a repair command has locked the table.

Find out why the table was locked and resolve the access issue (unless due to the repair command). You might have to resynchronize the data if DML was performed on the table. For more information, see How to Resynchronize Source and Target Tables.

Configuration deactivation when there are named export queues

When you are using named export queues, and you deactivate the configuration, Post could stop with the following error instead of posting the remaining data from the queues:

sp_opst_mt (for o.qa920-o.qa920 queue q5) 15007 - Can't open poster queue que_NOEXIST: Queue does not exist.

To start Post and finish replication, shut down SharePlex, then start it again.

Queue name is too long

Post stops if a queue name is too long.

Make certain the name assigned to named queues in the configuration file are no longer than 15 characters.

(Oracle) New tables are not added

For an Oracle source, tables created after activation are automatically added to replication.

The auto-add feature is controlled by parameters. Make certain the correct ones are set to achieve your goals. For more information, see Control Oracle DDL Replication.

(Oracle) No more open cursors

If you see the following error, Post has exceeded the available open cursors.

Warning: sp_opst_mt (for o.oracle-o.oracle queue oracle) Post has opened number cursors. No more available cursors! Exiting

Post requires a certain number of open cursors to the target database.

View the current database OPEN_CURSORS value using the following SQL statement:

select value from V$PARAMETER where name = 'open_cursors' ;

To determine an adequate OPEN_CURSORS value for SharePlex, see Adjust Open Cursors.

Other problems and solutions

Problem Description Solution
SharePlex cannot resolve a machine name Sometimes machine names cannot be resolved between Unix or Linux system. Add the IP addresses and names of all servers (Unix and Linux) in the replication network to the /etc/hosts file on all Unix and Linux machines.
sp_cop is using too much CPU time SharePlex may be performing its overhead activities too frequently.

Increase the idle time of sp_cop with the SP_COP_IDLETIME parameter. See the parameter documentation in theSharePlex Reference Guide.

Corrupted source table

If a source table is corrupted or there is another reason that you do not want the replicated data to be posted to the target database, you can prevent posting for that table without removing it from the active configuration or affecting posting for other objects.

To disable posting for one or more tables, use the SP_OPO_DISABLE_OBJECT_NUM or SP_OPX_DISABLE_OBJECT_NUM parameter, which can be set to disable posting of both DML and DDL operations for specified object IDs. This parameter is disabled by default. When you are ready to begin posting to the target table again, disable the parameter again by resetting it to 0. For more information, see the parameter documentation in theSharePlex Reference Guide.

Only some columns were replicated If you have a table that is configured for vertically partitioned replication but that table name also satisfies a wildcard, the specific listing (with the vertical partitioning) takes precedence over the wildcarded listing. Vertical partitioning cannot be used with full-table replication for the same table. No action is needed if replication of the specified columns is desired. For more information, see Configure Vertically Partitioned Replication.
Conflict resolution generates compile errors If you encounter compile problems with your conflict resolution routines, check whether any tables have the same names as their owners. A known issue in PL/SQL prevents the SharePlex conflict resolution logic from compiling the PL/SQL for tables whose names are the same as their owners. Oracle has stated that the issue will not be fixed. See Oracle TAR 2577886.996 for more information. This issue does not affect replication; SharePlex replicates data for tables with identical owner and table names.

Common replication errors

The following table explains many of the common error messages that you might experience during replication.

sp_cop error messages Cause Solution
sp_cop cannot setup; memory segment n in use. Processes that access the queues were still running when you last shut down sp_cop. Kill those processes. SharePlex processes start with sp_. When all have been killed, sp_cop should start.
Error: sp_cop can't setup shared memory statistics capability - exiting Error: sp_cop(shs) Cannot delete previous memory segment 303. Please check to see if any SharePlex processes are running (ps -ef | grep sp_). If there are some processes running then kill them and restart sp_cop. There are already one or more SharePlexsp_cop processes pointing to the same variable-data directory. To run multiple sessions of SharePlex, you need to use separate variable-data directories for each one. For more information, see Run Multiple Instances of SharePlex..
Capture error messages    
Capture time limit (300 sec) exceeded. Capture is not processing records, which could indicate a problem with the redo log. If, after a specific number of seconds, Capture cannot process a record, it stops, logs the record, and returns this message. See Oracle Capture-related issues for possible causes. If you cannot determine the cause of the problem, call Quest Support before a log wrap occurs.
(Oracle) Log wrap detected The redo logs wrapped and Capture cannot locate the archive logs. If archive logs are available, uncompress and restore them to the archive log directory. SharePlex looks for the archive logs first in the Oracle archive log list, then in the location specified by the SP_OCT_ARCH_LOC parameter. This parameter should always be set to the correct archived log directory. If you use compression for the archive logs, do not compress them until SharePlex is finished processing them. To determine the current log for SharePlex, issue the show capture command with the [detail] option in sp_ctrl on the source system. You can compress any logs that were generated before the current one. Note that this error also occurs when the archived log is corrupted.
Post error messages    
operation taking too long. It is taking more than the internally allowed time to apply a SQL statement to the target instance. For more information, see Oracle Post-related issues.
Rowid not found SharePlex cannot locate the correct row to update in the target database. Check for triggers, processes, or users that may have deleted the row on the target. For more information, see Solve Synchronization Problems.
Database not available. Post cannot log into the target database. Verify that the database is running, and determine whether someone changed the password of the SharePlex database account.
Oracle-related error messages    
Can’t access OBJ$Table SharePlex cannot access the Data Dictionary, which it must be able to do in order to replicate. Check the O7_DICTIONARY_ACCESSIBILITY Oracle tuning parameter and make sure it is set to TRUE (the default).
Forward and backward operation counts do not match... Messages may be out of sequence. Find out if Oracle was shut down before SharePlex. This can cause SharePlex to return errors, and in rare cases, corrupt the queues. The proper procedure is to shut down SharePlex and then shut down Oracle. For help resolving this problem, contact Quest Support.
Error: sp_opst_mt (for o.blues920-o.ora9 queue bluesky) 15033 - Failed to execute SQL on table: QA.T_DEST_1: ORA-00001: unique constraint (.) violated. A unique constraint was violated on the source system. The change entered the redo log, but Oracle rolled it back. The rollback also entered the redo log. SharePlex detects the constraint violation on the target. Ignore this message. The tables are still in synchronization because Oracle rolled back the offending operation. This is an unavoidable error because of the way Oracle handles the violation.
SQL Cache error messages    
Warning: Too many concurrent transactions. Will disable the SQL Cache capability. The SQL Cache size is set to 1, and more cursors are still needed. SharePlex disables the SQL Cache feature in this case. No action is required if this is your intended configuration. For more information, see Tune SQL Caching.

Warning: Running out of cursors. Number of cursors opened so far is number. Will attempt to decrease SQL Cache size.

or...

Notice: Shrinking SQL Cache size to number per session.

 Post detected that it will exceed its maximum number of cursors and is trying to decrease the SQL Cache size. No action is required unless the value gets to 1 and there are still not enough cursors. For more information, see Tune SQL Caching.
SQL Cache disabled. The SQL Cache feature is disabled. No action is required if this is your intended configuration. For more information, see Tune SQL Caching.
Hints file error messages (Oracle only)    
15050 – hint file not found

SharePlex looks for the hints.SID file whether you use it or not. The location of this file is the data sub-directory of the SharePlex variable-data directory. If this file gets moved or deleted, SharePlex returns this error message.

 To prevent this message, create a blank hints file in the data sub-directory of the variable-data directory. Name it hints.SID.

15051 – missing column in the hint file (either table of index name)

15052 – syntax error for tablename

15053 – syntax error for indexname

The hints file is not configured correctly. For more information, see Use Oracle INDEX Hints.
15054 – source table’s object_id not found in object cache The hints file includes a source table that is not in the active configuration. All tables in the hints file must be listed in the active configuration. If this table is in the configuration, make certain that the owner name and table name are spelled in the hints file the same way as they are in the configuration.
15055 – more than n valid entries were entered into the hints file The hints file permits only as many table-index combinations as the value set by the SP_OPO_HINTS_LIMIT parameter. Either remove some of the table-index combinations or increase the value of SP_OPO_HINTS_LIMIT. For more information about this parameter, see the Post parameters documentation in the SharePlex Reference Guide.
15056 – error allocation memory for hints This indicates a system-level memory problem; the hints file itself does not demand a significant amount of memory. If you believe the system memory is sufficient, stop the Post process and start it again. If you are not using the hints file, you can ignore this error.
17000 – error opening hint file SharePlex cannot open the hints file. Check the file for corruption. If the file is valid, make certain there is sufficient read permission for the Post process. For more information, see Use Oracle INDEX Hints.
Environment-related error messages    
sp_opst_mt: pid=num date/time src host/ sid=db01:N2PB /var/quest/vardir/log/ event_log: Too many open files The system file descriptors setting is not 1024.

Set the ulimit to 1024.

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.
06/29/00 08:05 System call error: sp_ocap(que) (for o.QA11 queue o.QA11) No space left on device devname 06/29/00 08:05 Internal error: sp_ocap (for o.QA11 queue o.QA11) 10705 - writecommit failed que_BUFWRTERR: Error writing buffer to file 06/29/00 08:05 Process exited sp_ocap (for o.QA11 queue o.QA11) [pid = 8692] -exit(1) SharePlex ran out of space for the queues on the disk. For more information, see How to Resolve Disk Space Shortage.
gethostbyname name failed - exiting

The local hosts file is not configured properly.

The host name is not specified correctly in the hosts file (/etc/hosts on Unix and Linux). If this system is not part of a cluster, make corrections to the name in the file. If this system is part of a cluster, the virtual IP address must be mapped to a host alias in the hosts file. For instructions on configuring SharePlex in a cluster, see the SharePlex Installation and Setup Guide.

Other error messages    
Snapshot too old The read-consistent view required by SharePlex is no longer available. Increase the size of the rollback segment.
Parameter paramname does not exist in the paramdefaults file. Using hard coded default value. Please make sure that your param-defaults file is the correct version.

SharePlex cannot find a parameter that it needs to reference. You have an older version of the param-defaults file than the version of SharePlex that you are running. Someone might have updated the SharePlex binaries using a downloaded patch, and may not have installed the latest param-default file.

Always check for an updated param-defaults file when you manually update SharePlex.

Invalid DATE format detected in record with rowid=rowid, on obj object_id. See capture log for detail. A user or application entered an invalid date value into the Oracle database that bypassed the database’s validity check. Set the SP_OCT_DEF_ parameters to enable SharePlex to fix the format of dates and times if they are not caught by the database checks. See the SP_OCT_DEF parameters documentation in the SharePlex Reference Guide.
shs_SHMERR: an error occurred with shared memory. You ran the qview utility without shutting down SharePlex (sp_cop). Shut down SharePlex and re-run qview.

Solve Oracle DDL replication problems

This section reviews many common problems and solutions encountered when replication of Oracle DDL is active. For more information about SharePlex DDL support, see Configure DDL Replication.

If the issue you are experiencing is not listed in this documentation, search the SharePlex Knowledge Base at:

https://support.quest.com.

The Knowledge Base provides filtering options and links to other resources that can help you use and troubleshoot SharePlex.

DDL is not replicating

Only some Oracle DDL is enabled by default. Other DDL support must be explicitly enabled with parameter settings.

The SP_OPO_STOP_ON_DDL_ERR parameter is defaulted to direct the Post process to stop if there is an error applying the DDL, to enable you to correct the problem to keep the databases synchronized. This parameter should be set to 1 (on). When enabled, messages such as the following notify you that DDL was skipped.

Skipping generic 9i DDL operation, schema (bob) could not be set.

FAILED DDL Replication for "create user bob."

Solution: Make certain the following parameters are set to appropriately. See Control Oracle DDL Replication for more information about how to use these parameters to configure DDL replication.

  • SP_OCT_REPLICATE_DDL
  • SP_OCT_AUTOADD_ENABLE
  • SP_OCT_AUTOADD_MVIEW
  • SP_OCT_AUTOADD_SEQ
  • SP_OCT_REPLICATE_ALL_DDL

Replicated DDL is not completely displayed in the Event Log

SharePlex prints replicated DDL to the Event Log, but it truncates statements longer than 2,000 characters. Only the first 2,000 characters are recorded in the log.

Solution: None required.

Solve queue problems

This topic helps you solve replication problems that may be related to the SharePlex queues.

If the issue you are experiencing is not listed in this documentation, search the SharePlex Knowledge Base at:

https://support.quest.com.

The Knowledge Base provides filtering options and links to other resources that can help you use and troubleshoot SharePlex.

SharePlex is running out of disk space

Data accumulating in the queues can cause SharePlex to run out of disk space. The following are some possible causes and solutions.

Problem Description Solution
Stopped replication processes

When replication processes stop, data accumulates in the queues.

If a process was stopped by a user, find out why and then start it as soon as possible so that SharePlex can process the accumulated data. If a process stopped because of an error, view the Event log with the show log command to find out what happened, then resolve the problem so that processing can continue and the queue backlog can be reduced.

Large operations

The Post queue may become large when storing large transactions for which there has not yet been a COMMIT. To allow for rollbacks and data recovery, SharePlex retains data in the post queue until it receives the COMMIT.

View the post queue with the qstatus command. If the value in the Backlog (messages) field remains constant or is shrinking, while the value in the Number of messages field is increasing, Post is waiting for a COMMIT before releasing the data.

Use the show post detail command to verify that Post is processing transactions normally. If possible, set the COMMIT point for your application to 500 to generate smaller SQL statements for SharePlex to process. Also, consider creating a configuration that uses named post queues which isolate tables that are known for long transactions. For more information, see Configure Named Post Queues.

If the accumulation of messages in the Post queue is threatening to cause disk space issues, you can stop Import until Post can clear out some of the operations from other transactions. For more information, see How to Resolve Disk Space Shortage.

(Oracle) Capture is processing archive logs

If Capture is processing archive logs, the capture queue consumes disk space while the archived records are being processed.

If the location of Capture in the logs is far behind that of the database, the latency between the source and target data may be too large to be acceptable to the target users. Rather than add more disk space to the variable-data directory, it might be more practical to run ora_cleansp to clean up the replication environment and queues, resynchronize the data, and reactivate the configuration.

If SharePlex continues to run out of disk space because Capture is processing the archive logs, the SharePlex Support team can help you tune the performance of Capture and adjust the redo configuration.

Unplanned increase in source transaction activity

An unplanned increase in activity on the source system can cause data to accumulate in the Post queue and approach the maximum amount of allocated disk space.

For more information, see How to Resolve Disk Space Shortage.

There is a “failure to write and open queue” error

If there is a sequence of messages in the Event Log similar to the following, stop and start sp_cop.

1 08-06-12 13:20:17.089485 2384 1 sp_ordr(rim) (for o.user queue o.user) Error opening output queue rv=9 que_open(-,writeuser+ X,0x0a02d364+PR+o.user+sp_ordr+o.user)

Notice 08-06-12 13:20:17.089485 2384 1 sp_ordr (for o.user queue o.user) data route to a02d364.48.7e failed err=100

Error 08-06-12 13:20:17.089485 2384 1 sp_ordr (for o.user queue o.user) 11004 - sp_ordr failure writing to queue(s)

Notice 08-06-12 13:20:17.089485 2384 1 sp_ordr (for o.user queue o.user) Exit sp_ordr to retry rim-write.

Info 08-06-12 13:20:17.089485 2384 1 Process exited sp_ordr (for o.user queue o.user) [pid = 8183] - exit(1)

The queues are corrupted

If the system that hosts SharePlex fails, one or more SharePlex queues can become corrupted, and there will be errors reading from and writing to them. In that case, the purge config and abort config commands cannot be used, because they rely on the queues to operate.

Solution: Contact SharePlex Support to resolve queue corruption issues.

The post queue seems too large

If the size of the post queue seems too large relative to the number of messages it contains, that is not unusual. The SharePlex post queue actually consists of a number of sub-queues, each approximately corresponding to a user session on the source system. A sub-queue can have one or more files associated with it, each with a default size of 8 MB. If the entire 8 MB of size is not used, the file remains on the system even after the data has been posted and read-released.

Solution: The size for the post queue in a status display is the actual disk space used by all of the queue files. You can eliminate obsolete files that have been read-released by using the trim command in the SharePlex qview utility. Thecommand preserves files containing data not yet posted and committed to the target database. See the SharePlex Reference Guide for more information about the qview utility.

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