进行传递，从而实现不同DB数据库的复制。 2016Postgres中国用户大会 Postgres Conference China 2016 中国用户大会 如何自定义输出插件 我们所要实现以下几个回调函数： LogicalDecodeStartupCB startup_cb; LogicalDecodeBeginCB begin_cb; LogicalDecodeChangeCB change_cb; LogicalDecodeShutdownCB shutdown_cb; 2016Postgres中国用户大会 Postgres Conference China 2016 中国用户大会 函数意义 复制槽初始化会调用 startup_cb 之前活跃的复制槽不再使用，就会调用 可选的 shutdown_cb 开始动作被解码，就会调用begin_cb回调。 被中止的事务及其内容不会被解码。 返回槽slot_name中的改变，从上一次已经被消费的点开始返回。 pg_logical_slot_peek_changes • 参数和行为就像pg_logical_slot_get_changes()函数，不过改变不会被 消费，即在未来的调用中还会返回这些改变。 2016Postgres中国用户大会 Postgres Conference China 2016 中国用户大会 使用限制

PostgreSQL （云Greenplum）低成本，快速 构筑在线企业数据仓库。 • 应用易开发、适配 支持SQL 2003，部分兼容Oracle语法， 支持PL/SQL 存储过程，OLAP窗口函数，事务及数据库标准隔离级别 完备功能和生态，实现应用快速迁移或适配 • PB级数据秒级响应 MPP水平扩展架构，PB级数据查询秒级响应；向量化计算，及列存储智能索引，领先传统数据库引擎性能 3x； 典型场景分析 数据分析场景 场景挑战 AnalyticDB for PostgreSQL 优势 ETL 批量处理 • 复杂 SQL 调优 • 海量数据关联聚合 • 支持标准SQL，OLAP窗口函数，存储过程 • 新一代Cascade框架 分布式SQL优化器，复杂查询免调优 • MPP多节点全并行计算，PB级数据秒级响应 • 基于列存储的高性能大表扫描，及高压缩比 在线数据探索 • 高并发

容复制到日志缓冲区内。 在日志缓冲区刷新期间检查日志缓冲区是否有新内容添加，因为这 关系到设置日志缓冲区的刷新点。 确定检查点重做位置在联机备份期间强制执行完整页写入，直到备 份完成。 从内置函数获取当前WAL插入位置。 2016Postgres中国用户大会 Postgres Conference China 2016 中国用户大会  Locks of WAL • WALWriteLock

Interface Definition ............................................................. 2471 62.1. Basic API Structure for Indexes ................................................................ 2471 62.2. Index Table 9.45.) An example of creating an index with this operator class is: CREATE INDEX idxgin ON api USING GIN (jdoc); 191 Data Types The non-default GIN operator class jsonb_path_ops does not support @? and @@. An example of creating an index with this operator class is: CREATE INDEX idxginp ON api USING GIN (jdoc jsonb_path_ops); Consider the example of a table that stores JSON documents retrieved

Method Interface Definition ....................................................... 2338 62.1. Basic API Structure for Indexes .......................................................... 2338 62.2. Index Access Table 9.45.) An example of creating an index with this operator class is: CREATE INDEX idxgin ON api USING GIN (jdoc); The non-default GIN operator class jsonb_path_ops does not support the key-exists @? and @@. An example of creating an index with this operator class is: CREATE INDEX idxginp ON api USING GIN (jdoc jsonb_path_ops); Consider the example of a table that stores JSON documents retrieved

Method Interface Definition ....................................................... 2254 61.1. Basic API Structure for Indexes .......................................................... 2254 61.2. Index Access Table 9.45.) An example of creating an index with this operator class is: CREATE INDEX idxgin ON api USING GIN (jdoc); The non-default GIN operator class jsonb_path_ops does not support the key-exists @? and @@. An example of creating an index with this operator class is: CREATE INDEX idxginp ON api USING GIN (jdoc jsonb_path_ops); Consider the example of a table that stores JSON documents retrieved

Method Interface Definition ....................................................... 2259 61.1. Basic API Structure for Indexes .......................................................... 2259 61.2. Index Access Table 9.45.) An example of creating an index with this operator class is: CREATE INDEX idxgin ON api USING GIN (jdoc); The non-default GIN operator class jsonb_path_ops does not support the key-exists @? and @@. An example of creating an index with this operator class is: CREATE INDEX idxginp ON api USING GIN (jdoc jsonb_path_ops); Consider the example of a table that stores JSON documents retrieved

Interface Definition ............................................................. 2389 61.1. Basic API Structure for Indexes ................................................................ 2389 61.2. Index example of creating an index with this operator class is: 189 Data Types CREATE INDEX idxgin ON api USING GIN (jdoc); The non-default GIN operator class jsonb_path_ops does not support the key-exists @? and @@. An example of creating an index with this operator class is: CREATE INDEX idxginp ON api USING GIN (jdoc jsonb_path_ops); Consider the example of a table that stores JSON documents retrieved

Interface Definition ............................................................. 2387 61.1. Basic API Structure for Indexes ................................................................ 2387 61.2. Index Table 9.45.) An example of creating an index with this operator class is: CREATE INDEX idxgin ON api USING GIN (jdoc); The non-default GIN operator class jsonb_path_ops does not support the key-exists @? and @@. An example of creating an index with this operator class is: CREATE INDEX idxginp ON api USING GIN (jdoc jsonb_path_ops); Consider the example of a table that stores JSON documents retrieved

.............................................672 25.3.3. Making a Base Backup Using the Low Level API .........................................673 25.3.3.1. Making a non-exclusive low level backup .. Definition ............................................................................2263 59.1. Basic API Structure for Indexes ............................................................................ Table 9-43.) An example of creating an index with this operator class is: CREATE INDEX idxgin ON api USING GIN (jdoc); The non-default GIN operator class jsonb_path_ops supports indexing the @> operator