SymmetricDS 是一个 Java 工具，它可以通过间歇性的互联网连接复制数据库和表。我在配置它以与 postgresql 配合使用时遇到了麻烦。
我正在做的这块配置说明：
#Next, create the SymmetricDS-specific tables in the corp node database.
#These tables will
#contain the configuration for synchronization. The following command uses
#the auto-creation
#feature to create all the necessary SymmetricDS system tables.
../bin/symadmin --engine corp-000 create-sym-tables
当我运行此命令时，出现以下异常：
[corp-000] - PostgreSqlSymmetricDialect - Done with auto update of
SymmetricDS tables
[corp-000] - PostgreSqlSymmetricDialect - Please add
"custom_variable_classes = 'symmetric'"
to your postgresql.conf file
-------------------------------------------------------------------------------
An exception occurred. Please see the following for details:
-------------------------------------------------------------------------------
org.postgresql.util.PSQLException: ERROR: unrecognized configuration parameter "symmetric.triggers_disabled"
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:410)
at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
at org.jumpmind.db.sql.JdbcSqlTransaction$5.execute(JdbcSqlTransaction.java:299)
at org.jumpmind.db.sql.JdbcSqlTransaction$5.execute(JdbcSqlTransaction.java:289)
at org.jumpmind.db.sql.JdbcSqlTransaction.executeCallback(JdbcSqlTransaction.java:316)
org.jumpmind.db.sql.SqlException: ERROR: unrecognized configuration parameter "symmetric.triggers_disabled"
at org.jumpmind.db.sql.AbstractSqlTemplate.translate(AbstractSqlTemplate.java:288)
at org.jumpmind.db.sql.AbstractSqlTemplate.translate(AbstractSqlTemplate.java:279)
at org.jumpmind.db.sql.JdbcSqlTransaction.executeCallback(JdbcSqlTransaction.java:318)
at org.jumpmind.db.sql.JdbcSqlTransaction.prepareAndExecute(JdbcSqlTransaction.java:289)
at org.jumpmind.symmetric.db.postgresql.PostgreSqlSymmetricDialect.enableSyncTriggers(PostgreSqlSymmetricDialect.java:217)
at org.jumpmind.symmetric.db.postgresql.PostgreSqlSymmetricDialect.createRequiredDatabaseObjects(PostgreSqlSymmetricDialect.java:75)
org.jumpmind.symmetric.SymmetricException: Please add "custom_variable_classes = 'symmetric'" to your postgresql.conf file
at org.jumpmind.symmetric.db.postgresql.PostgreSqlSymmetricDialect.createRequiredDatabaseObjects(PostgreSqlSymmetricDialect.java:79)
at org.jumpmind.symmetric.db.AbstractSymmetricDialect.initTablesAndDatabaseObjects(AbstractSymmetricDialect.java:154)
at org.jumpmind.symmetric.AbstractSymmetricEngine.setupDatabase(AbstractSymmetricEngine.java:364)
at org.jumpmind.symmetric.SymmetricAdmin.createSymTables(SymmetricAdmin.java:424)
at org.jumpmind.symmetric.SymmetricAdmin.executeWithOptions(SymmetricAdmin.java:270)
at org.jumpmind.symmetric.AbstractCommandLauncher.execute(AbstractCommandLauncher.java:130)
at org.jumpmind.symmetric.SymmetricAdmin.main(SymmetricAdmin.java:119)
-------------------------------------------------------------------------------
我的数据库中创建了一堆表，所以它似乎可以正常工作。我对 postgresql.conf 文件进行了更改，但仍然抛出了此异常。出了什么问题？
答案1
我犯的错误是编辑了错误的 postgresql.conf 文件，然后没有重新启动 postgresql 数据库，因此这些更改不会生效。我可以通过执行以下操作来消除此异常：
找到你真正的 postgresql.conf 文件，我的是
/var/lib/pgsql/data/postgresql.conf以 root 身份编辑文件并根据异常内容更改行：
#custom_variable_classes = '' custom_variable_classes = 'symmetric'保存文件并重新启动 postgresql：
systemctl start postgresql.service再次运行命令
../bin/symadmin --engine corp-000 create-sym-tables
它正常完成并打印以下结果：
[el@rosewill samples ]$ ../bin/symadmin --engine corp-000 create-sym-tables
Log output will be written to ../logs/symmetric.log
[] - AbstractCommandLauncher - Option: name=engine, value={corp-000}
[corp-000] - PostgreSqlSymmetricDialect - The DbDialect being used is org.jumpmind.symmetric.db.postgresql.PostgreSqlSymmetricDialect
[corp-000] - ExtensionPointManager - Found 5 extension points that will be registered
[corp-000] - AbstractSymmetricEngine - Initializing SymmetricDS database
[corp-000] - PostgreSqlSymmetricDialect - Checking if SymmetricDS tables need created or altered
[corp-000] - PostgreSqlSymmetricDialect - Just installed sym_triggers_disabled
[corp-000] - PostgreSqlSymmetricDialect - Just installed sym_node_disabled
[corp-000] - PostgreSqlSymmetricDialect - Just installed sym_largeobject
[corp-000] - ConfigurationService - Auto-configuring config channel
[corp-000] - ConfigurationService - Auto-configuring reload channel
[corp-000] - ConfigurationService - Auto-configuring heartbeat channel
[corp-000] - ConfigurationService - Auto-configuring default channel
[corp-000] - ConfigurationService - Auto-configuring filesync channel
[corp-000] - AbstractSymmetricEngine - Done initializing SymmetricDS database
对 symmetricDS 开发人员的一个请求，请使用简洁明了的错误消息，而不是在 21 页控制台输出的末尾显示 3 页错误消息。当用户挠头想知道这是什么时：错误：无法识别的配置参数“symmetric.triggers_disabled”。