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别再给 PG 装插件了:SQL/PGQ、REPACK、并行 Vacuum 全进内核

别再给 PG 装插件了:SQL/PGQ、REPACK、并行 Vacuum 全进内核

别再给 PG 装插件了:SQL/PGQ、REPACK、并行 Vacuum 全进内核

正文内容

三十年,从"够用"到"全能"。

2026 年 7 月 16 日,PostgreSQL 19 Beta 2 发布,特性冻结。这不是一次普通的年度迭代——SQL/PGQ 原生图查询、REPACK CONCURRENTLY 在线表重建、并行 Autovacuum、在线 Checksum 启用,每一项都精准命中了生产环境最痛的运维场景。

而就在上个月,pgAdmin 4 一口气爆出 8 个 CVE,其中包括一个 CVSS 近乎满分的 RCE 漏洞。安全圈炸了锅。

一边是内核能力的爆发式增长,一边是工具链的安全警钟——PG 的 2026,比往年都热闹。


PG 19 Beta 2:四个你不该忽略的新特性

1. SQL/PGQ:你的关系库,本来就是个图

这是 PG 19 的头条特性。CREATE PROPERTY GRAPH 一句 DDL,就能在现有关系表上声明一个图模型:

CREATE PROPERTY GRAPH social_graph
  VERTEX TABLES (users LABEL person, posts LABEL post)
  EDGE TABLES (
    follows SOURCE KEY (follower_id) REFERENCES users(id)
            DESTINATION KEY (followed_id) REFERENCES users(id) LABEL follows
  );

然后直接用图语法查:

SELECT*FROM GRAPH_TABLE (social_graph
MATCH (a IS person WHERE a.name ='Alice')
-[IS follows]->(b IS person)-[IS follows]->(c IS person)
  COLUMNS (b.name AS friend, c.name AS friend_of_friend)
);

底层发生了什么?PG 把图模式重写为标准 JOIN,在你现有的索引和统计信息上跑。没有新存储引擎,没有数据搬迁,没有第二个数据库。

诚实地说:v19 的 SQL/PGQ 是只读的,只支持固定深度遍历。可变长度路径(* / + 量词)要等后续版本。但"你还需要一个专门的图数据库"这个论点,从今天起难讲了十倍。

2. REPACK CONCURRENTLY:维护窗口终结者

表膨胀是每个 DBA 的噩梦。VACUUM FULL 持 ACCESS EXCLUSIVE 锁跑完全程——大表上等于停机。pg_repack 扩展干了十年这件事,但它是第三方 C 扩展,每次大版本升级都要祈祷兼容性。

PG 19 把 REPACK 写进内核:

REPACK TABLE orders;

底层逻辑:先建一份表副本,用逻辑解码回放期间的并发写入,最后只持几秒排他锁做文件交换——表全程可读可写。代价只有一个:磁盘需要能装下表的第二份完整副本。几百 GB 的大表,先算磁盘余量再动手。

3. 并行 Autovacuum + 在线 Checksum

ALTER TABLE orders SET (autovacuum_vacuum_index_parallel_workers =4);

一张 4000 万行、五个索引的表,Vacuum 时间从 22 分钟降到 7 分钟。但别高兴太早——每个并行 worker 独立吃 maintenance_work_mem,集群级的内存天花板是 autovacuum_max_workers × autovacuum_max_parallel_workers × maintenance_work_mem。不改内存预算就加并行度,OOM Killer 会教你做人。

在线 Checksum 更直接:SELECT pg_enable_data_checksums() 在运行中的集群上启用,不再需要停机。initdb 时忘了开 Checksum 的团队,这次不用重来了。

4. 那些「不起眼」但救命的改动

  • • WAIT FOR LSN:读写分离架构下,备库查询前等待主库指定 LSN,真正实现"读己之写"的强一致性。以前靠 sleep(100ms) 凑合的日子结束了。
  • • 默认关闭 JIT:对 90% 的 OLTP 负载,JIT 编译的开销比收益大。这个改动默默救了无数被 JIT 拖慢的查询。
  • • 64 位 MultiXactOffset:40 亿记录溢出风险从此成为历史。
  • • EXPLAIN (IO):直接看 ReadStream / AIO 层的预取命中率,不再靠 BUFFERS 猜。
  • • pg_plan_advice:优化器终于自己解释"为什么没选那个索引"。

PG 18 你还记得多少?

PG 18 的核心是 AIO 异步 I/O 子系统io_method = io_uring 让顺序扫描、Bitmap Heap Scan 和 Vacuum 不再阻塞等待磁盘。实测数据:NVMe 上 +3540%,EBS gp3 上 +1520%,"3 倍提升"是官方最理想场景。

其他值得记住的:B-tree Skip Scan(多列索引跳过前导列)、虚拟生成列(默认不占磁盘)、OLD/NEW in RETURNING(一行 SQL 拿到改前改后数据)、原生 OAuth 2.0 认证、UUIDv7、pg_upgrade --swap。


PG 正在吃掉什么?

图数据库:SQL/PGQ 来了,固定深度遍历的场景不用再搞 Neo4j + Kafka + 数据同步三件套。

向量数据库:pgvector 0.8.x 配合 pgvectorscale,千万级向量以内的 RAG 场景,pgvector 的 HNSW + SQL WHERE 过滤组合往往比专用向量库更快。Pinecone 和 Weaviate 的立身之本是十亿级向量和混合搜索,但绝大多数团队连百万级都没到。

数据仓库:pg_duckdb 1.0 百万下载,嵌 DuckDB 向量化引擎进 PG;pg_mooncake 把 PG 推入 ClickBench 前十。TPC-H 查询 2~7 倍加速,一行 SET enable_duckdb = on 搞定。5TB 以下的分析负载,先试试列存扩展,再决定买不买 Snowflake。


安全:别光看新特性,赶紧打补丁

8 月 3 日,pgAdmin 4 爆出 CVE-2026-17566——Import/Export 工具的命令注入漏洞,低权限用户可 RCE。根源是 backslash 转义语义与 PostgreSQL 默认 standard_conforming_strings=on 不一致,一个用了十几年的假设终于被利用。

同期还有 7 个 CVE:CVE-2026-17351(AI 助手 SQL 注入,CVSS 9.0)、CVE-2026-17347(MASTER_PASSWORD_HOOK 命令注入)、CVE-2026-17350(共享连接配置泄露)……

立刻升级 pgAdmin 4 到 9.18。PG 内核方面,5 月发布的 18.4 修复了 11 个 CVE,务必确认当前版本。


升级路线图

版本
状态
EOL
PG 13
已 EOL
2025-11
PG 14
即将 EOL
2026-11-12(不足 3 个月)
PG 15
稳定
2027-11
PG 16
稳定
2028-11
PG 17
当前稳定
2029-11
PG 18
当前最新
2030-11
PG 19
Beta 2
预计 2031-11

还在 PG 14 及以下的,只剩不到 90 天。建议直接跳 PG 18,等 PG 19 GA 后再评估升级。PG 18 的 AIO 已经覆盖了日常 OLTP 最大的性能红利,PG 19 的运维增强可以在下一个维护窗口从容升级。


PostgreSQL 三十岁了。 它没有变成一个"什么都做但什么都做不好"的庞然大物,而是在保持内核克制的前提下,让扩展生态和标准 SQL 能力共同演进。图查询不用装 AGE 了,列存加速 pg_duckdb 一行开关搞定,向量检索 pgvector 开箱即用。

世界最强的开源数据库,正在全面进化。

核心观点:PostgreSQL 19 不是一次功能堆砌式的年度升级,而是通过 SQL/PGQ、REPACK CONCURRENTLY、并行 Autovacuum 三大内核级特性,在"图查询""在线运维"和"自动化治理"三个维度上实现了质的跨越。配合 pgvector + pg_duckdb + pg_mooncake 的扩展矩阵,PG 正在从"关系数据库"蜕变为"数据平台"。

参考的文章

  1. 1. Postgres 19 Learned to Speak Graph[1] - 作者:Bluetick Consultants - SQL/PGQ 深度解读
  2. 2. PostgreSQL 18/19 新特性深度解读[2] - 作者:IvorySQL - 从 IO 预取到智能运维
  3. 3. You Probably Don't Need a Data Warehouse Yet: Postgres Analytics in 2026[3] - 作者:Reptile Haus - PG 分析能力崛起

引用链接

[1] Postgres 19 Learned to Speak Graph: https://www.bluetickconsultants.com/postgresql-19-sql-pgq-graph-queries
[2] PostgreSQL 18/19 新特性深度解读: https://www.cnblogs.com/ivorysql/p/22216525
[3] You Probably Don't Need a Data Warehouse Yet: Postgres Analytics in 2026: https://reptile.haus/journal/you-probably-dont-need-data-warehouse-postgres-analytics-2026

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-08-12 11:57:57 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/926500.html
  2. 运行时间 : 0.216910s [ 吞吐率:4.61req/s ] 内存消耗:4,611.57kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=940c0cf36ad6d33752d43f1617cd1418
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  1. CONNECT:[ UseTime:0.000962s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001518s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000728s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000686s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001313s ]
  6. SELECT * FROM `set` [ RunTime:0.000599s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001452s ]
  8. SELECT * FROM `article` WHERE `id` = 926500 LIMIT 1 [ RunTime:0.001185s ]
  9. UPDATE `article` SET `lasttime` = 1786507077 WHERE `id` = 926500 [ RunTime:0.017094s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000597s ]
  11. SELECT * FROM `article` WHERE `id` < 926500 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001153s ]
  12. SELECT * FROM `article` WHERE `id` > 926500 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001039s ]
  13. SELECT * FROM `article` WHERE `id` < 926500 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008078s ]
  14. SELECT * FROM `article` WHERE `id` < 926500 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001951s ]
  15. SELECT * FROM `article` WHERE `id` < 926500 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002086s ]
0.220891s