百科 / psql 命令 / 描述数据库对象

\dX

列出扩展统计信息。如果指定了 pattern ，则只列出名称与模式匹配的扩展统计信息。如果在命令名后追加 x ，结果会以扩展模式显示。

当前查看 PostgreSQL 18。

中文定义与说明

列出扩展统计信息。如果指定了 pattern，则只列出名称与模式匹配的扩展统计信息。如果在命令名后追加 x，结果会以扩展模式显示。

每种扩展统计信息的状态显示在以其统计类型命名的列中（例如 Ndistinct）。defined 表示在创建统计信息时请求了该信息，NULL 表示未请求。如果想知道是否已经运行了 ANALYZE，以及这些统计信息是否已经对规划器可用，可以查看 pg_stats_ext。

说明

列出扩展统计信息。如果指定了 pattern ，则只列出名称与模式匹配的扩展统计信息。如果在命令名后追加 x ，结果会以扩展模式显示。

客户端: psql 18.7
区分大小写的写法: \dX

用法

\dX[x] [ pattern ]

本版手册中的写法

命令	手册中的后缀修饰符
\dX	x

手册定义

列出扩展统计信息。如果指定了 pattern，则只列出名称与模式匹配的扩展统计信息。如果在命令名后追加 x，结果会以扩展模式显示。

文档与源码

18.7 English manual · app-psql.html

来源构建

版本: 18.7
构建: https://ftp.postgresql.org/pub/source/v18.7/postgresql-18.7.tar.bz2
来源指纹: 1b2d62b4845aa46374f2cb680f95d3392322cc8128646992ae4e18d0e7084915

版本比较

PostgreSQL 18 → 19: 属性变化。

以下差异保留原始字段名与英文源描述。

--- PostgreSQL 18
+++ PostgreSQL 19
@@ -1,12 +1,12 @@
 {
-  "definition": "Lists extended statistics. If pattern is specified, only those extended statistics whose names match the pattern are listed. If x is appended to the command name, the results are displayed in expanded mode. The status of each kind of extended statistics is shown in a column named after its statistic kind (e.g. Ndistinct). defined means that it was requested when creating the statistics, and NULL means it wasn't requested. You can use pg_stats_ext if you'd like to know whether ANALYZE was run and statistics are available to the planner.",
+  "definition": "Lists extended statistics. If pattern is specified, only those extended statistics whose names match the pattern are listed. If x is appended to the command name, the results are displayed in expanded mode. If + is appended to the command name, each object is listed with its associated description. The status of each kind of extended statistics is shown in a column named after its statistic kind (e.g. Ndistinct). defined means that it was requested when creating the statistics, and NULL means it wasn't requested. You can use pg_stats_ext if you'd like to know whether ANALYZE was run and statistics are available to the planner.",
   "modifiers": [
     {
       "command": "\\dX",
-      "modifiers": "x"
+      "modifiers": "x+"
     }
   ],
-  "signature": "\\dX[x] [ pattern ]",
+  "signature": "\\dX[x+] [ pattern ]",
   "spellings": [
     "\\dX"
   ]

比较已记录的接口与属性，排除来源指纹和构建元数据。某个样本中没有记录，不能据此判断实际引入或移除的版本。

快速链接

\dX