机器学习算法库，实现数据智能探索；高性 能向量检索算法，支持视频/图像检索 以图搜图 AnalyticDB for PostgreSQL 产品架构 协调节点 OSS 分布式云存储服务 SQL Client/BI Tools 协调节点（Master Node） • 接收请求，制定分布式执行计划 计算组（Compute Groups） • 全并行分析计算 • 数据双副本存储 • 定期自动备份 OSS • 数据并行加载 数据并行加载 • 水平扩展：Share-Nothing 架构水平扩展，海量数据在线分析 • 行/列存储模型：行存储支持高并发在线分析，列存储支持全表数据高性能关联聚合 • 高可靠架构：支持分布式事务及ACID，双副本、主备切换透明，支持服务高可用 分 区 分 区 分 区 分 区 计算组 分 区 分 区 分 区 分 区 计算组 分 区 分 区 分 区 分 区 计算组 AnalyticDB 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 • 任意维度随机查询 • 实时入库更新 • 高吞吐数据写入及更新 （INSERT/UPDATE/DELETE） • 行存储及多种索引（Btree, Bitmap 等），点查询毫秒级返回 • 支持分布式事务，标准数据库隔离级别

# EL8安装光盘AppSteam里自带有10.x 版本的软件包 # postgresql-setup --initdb --unit postgresql # systemctl enable postgresql # systemctl start postgresql 如果想安装其他版本，可到官网查询安装方法 h�ps://www.postgresql.o org/download/linux/redhat/ 本文档选择PG-13版本作为讲解，使用el8系列的系统，x86_64平台 # yum install -y h�ps://download.postgresql.org/pub/repos/yum/reporpms/EL-8-x86_64/pgdg-redhat- repo-latest.noarch.rpm #或者直接创建repo文件，内容如下 postgresql-13 ★第2章、设置数据存储路径 PostgreSQL 初始化数据库之后， 10版本的默认的数据目录是/var/lib/pgsql/ 13版本的默认的数据目录是/var/lib/pgsql/13/ 现在想修改为/data_pg/ 目录 ★PG-13版本 # systemctl stop postgresql-13 #先停止服务

Postgres Conference China 2016 中国用户大会 是否能保证备库使用WAL段之前不会 过早的移除它们 主库不会过早的清除掉掉从库正在使 用的记录 是否可以控制日志大小 复制槽技术 可以保证 可以保证 可能会造成膨胀 非复制槽 不能保证 不能保证 不会造成膨胀 复制槽技术 2016Postgres中国用户大会

• 逻辑复制 • 误操作恢复 2016Postgres中国用户大会 Postgres Conference China 2016 中国用户大会  Logminter • 利用多版本特性，尽可能恢复数据。 • 打开pg_log，查找误操作信息，进行还原。 • 利用pg_xlogdump查看wal日志信息，确定时 间点，然后恢复。 2016Postgres中国用户大会

Department. POST- GRES pioneered many concepts that only became available in some commercial database systems much later. PostgreSQL is an open-source descendant of this original Berkeley code. It supports rules system ), the rule system was redesigned ( On Rules, Procedures, Caching and Views in Database Systems ) and Version 2 was released in June 1990 with the new rule system. Version 3 appeared in 1991 and an asteroid tracking database, a medical information database, and several geographic information systems. POSTGRES has also been used as an educational tool at several universities. Finally, Illustra Information

Department. POST- GRES pioneered many concepts that only became available in some commercial database systems much later. PostgreSQL is an open-source descendant of this original Berkeley code. It supports rules system), the rule system was redesigned (On Rules, Procedures, Caching and Views in Database Systems) and Version 2 was released in June 1990 with the new rule system. Version 3 appeared in 1991 and an asteroid tracking database, a medical information database, and several geographic information systems. POSTGRES has also been used as an educational tool at several universities. Finally, Illustra Information

......494 17.2.1. Use of Secondary File Systems.......................................................................495 17.2.2. Use of Network File Systems ......................................... Department. POST- GRES pioneered many concepts that only became available in some commercial database systems much later. PostgreSQL is an open-source descendant of this original Berkeley code. It supports rules system ), the rule system was redesigned ( On Rules, Procedures, Caching and Views in Database Systems ), and Version 2 was released in June 1990 with the new rule system. Version 3 appeared in 1991 and

rules system), the rule system was redesigned (On Rules, Procedures, Caching and Views in Database Systems) and Version 2 was released in June 1990 with the new rule system. Version 3 appeared in 1991 and aster- oid tracking database, a medical information database, and several geographic information systems. POSTGRES has also been used as an educational tool at several universities. Finally, Illustra Infor- are a number of other ways of organizing databases. Files and directories on Unix-like operating systems form an example of a hierarchical database. A more modern development is the object- oriented database

Department. POST- GRES pioneered many concepts that only became available in some commercial database systems much later. PostgreSQL is an open-source descendant of this original Berkeley code. It supports rules system ), the rule system was redesigned ( On Rules, Procedures, Caching and Views in Database Systems ) and Version 2 was released in June 1990 with the new rule system. Version 3 appeared in 1991 and an asteroid tracking database, a medical information database, and several geographic information systems. POSTGRES has also been used as an educational tool at several universities. Finally, Illustra Information

..........467 17.2.1. Use of Secondary File Systems................................................................468 17.2.2. Use of Network File Systems ............................................ rules system ), the rule system was redesigned ( On Rules, Procedures, Caching and Views in Database Systems ), and Version 2 was released in June 1990 with the new rule system. Version 3 appeared in 1991 and aster- oid tracking database, a medical information database, and several geographic information systems. POSTGRES has also been used as an educational tool at several universities. Finally, Illustra Infor-