DB2 各种ID 以及其它标识符

activity_id

Counter which uniquely identifies an activity for an application within a given unit of work.

uow_id

The unit of work identifier. The unit of work ID is unique within an application handle.

appl_id

This identifier is generated when the application connects to the database at the database manager or when DB2 Connect receives a request to connect to a DRDA database.

This ID is known on both the client and server, so you can use it to correlate the client and server parts of the application. For Db2 Connect applications, you will also need to use outbound_appl_id monitor element to correlate the client and server parts of the application.

stmtid

The hash key value that identifies normalized statement text that is associated with a section. Semantic content such as the function path and current schema are not part of the statement identifier.

Use this monitor element with the semantic_env_id monitor element to aggregate and group monitor data for similar statements.

agent_id

A system-wide unique ID for the application. In a single-member database configuration, this identifier consists of a 16-bit counter. In a multi-member configuration, this identifier consists of the coordinating member number concatenated with a 16-bit counter. In addition, this identifier is the same on every member where the application may make a secondary connection.

The application handle, also known as the agent ID, can be used to uniquely identify an active application.

stmtno

Statement number within a package for a static SQL statement.

This element is set to ‘1’ for dynamic SQL statements. The element is set to ‘-1’ if the statement number is unavailable, for example the statement number for DDL statements is not available.

For static SQL statements, this value is the same as the value used for the SYSCAT.STATEMENTS catalog view.

executable_id

An opaque binary token generated on the data server that uniquely identifies the SQL statement section that was executed. For non-SQL activities, a 0-length string value is returned.

Use this monitor element as input to different monitoring interfaces to obtain data about the section. The MON_GET_PKG_CACHE_STMT table function, which is used to get SQL statement activity metrics in the package cache, takes the executable ID as input.

planid

The hash key value which identifies a query plan for a section.

The planid monitor element tracks important performance sensitive aspects of the access plan. Such aspects include the list and layout of access plan operators, identifiers of the objects that are being accessed, the number of each type of predicate for each operator, and performance sensitive operator arguments.

Use this monitor element with the stmtid and semantic_env_id monitor elements to detect changes in access plan that might affect performance.

A hash key value for identifying the elements of the query compilation environment that have an effect on the semantics of an SQL statement.

semantic_env_id

This hash value is computed over the default schema and function path elements in the compilation environment.

A value of 1 means the default schema and function path were not used during the compilation of the statement. The function path is treated as not being used if only functions in the SYSIBM schema are accessed and SYSIBM is the first entry in the function path.

A value of 0 means the query semantic environment ID is not available. An example where the query semantic environment ID is not available is if the statement was compiled on a release of Db2® before Version 10.5 Fix Pack 3.

Use this element with the query statement ID monitor element (stmtid) to identify an SQL statement. The semantic compilation environment ID is used to distinguish queries that have the same statement text, but are semantically different because they reference different objects. For example, the table that is referenced in the statement SELECT * FROM T1 depends on the value of the default schema in the compilation environment. If two users with different default schemas issued this statement, there would be two entries for the statement in the package cache. The two entries would have the same stmtid value, but would have different values for semantic_env_id.

stmt_pkgcache_id

This element shows the internal package cache identifier (ID) for a dynamic SQL statement.

stmt_invocation_id

An identifier that distinguishes one invocation of a routine from others at the same nesting level within a unit of work. It is unique within a unit of work for a specific nesting level. This monitor element is an alias for the invocation_id element.

You can use this element to uniquely identify the invocation in which a particular SQL statement has been executed. You can also use this element in conjunction with other statement history entries to see the sequence of SQL statements that caused the deadlock.

stmt_nest_level

This element shows the level of nesting or recursion in effect when the statement was being run; each level of nesting corresponds to nested or recursive invocation of a stored procedure or user-defined function (UDF). This monitor element is an alias for the nesting_level element.

1. 全新的界面设计 ，将会带来全新的写作体验；
2. 在创作中心设置你喜爱的代码高亮样式，Markdown 将代码片显示选择的高亮样式 进行展示；
3. 增加了 图片拖拽 功能，你可以将本地的图片直接拖拽到编辑区域直接展示；
4. 全新的 KaTeX数学公式 语法；
5. 增加了支持甘特图的mermaid语法¹ 功能；
6. 增加了 多屏幕编辑 Markdown文章功能；
7. 增加了 焦点写作模式、预览模式、简洁写作模式、左右区域同步滚轮设置 等功能，功能按钮位于编辑区域与预览区域中间；
8. 增加了 检查列表 功能。

功能快捷键

撤销：Ctrl/Command + Z
重做：Ctrl/Command + Y
加粗：Ctrl/Command + B
斜体：Ctrl/Command + I
标题：Ctrl/Command + Shift + H
无序列表：Ctrl/Command + Shift + U
有序列表：Ctrl/Command + Shift + O
检查列表：Ctrl/Command + Shift + C
插入代码：Ctrl/Command + Shift + K
插入链接：Ctrl/Command + Shift + L
插入图片：Ctrl/Command + Shift + G

合理的创建标题，有助于目录的生成

直接输入1次#，并按下space后，将生成1级标题。
输入2次#，并按下space后，将生成2级标题。
以此类推，我们支持6级标题。有助于使用TOC语法后生成一个完美的目录。

如何改变文本的样式

强调文本 强调文本

加粗文本 加粗文本

标记文本

删除文本

引用文本

H₂O is是液体。

2¹⁰ 运算结果是 1024.

插入链接与图片

链接: link.

图片:

带尺寸的图片:

居中的图片:

居中并且带尺寸的图片:

当然，我们为了让用户更加便捷，我们增加了图片拖拽功能。

如何插入一段漂亮的代码片

去博客设置页面，选择一款你喜欢的代码片高亮样式，下面展示同样高亮的 代码片.

// An highlighted block
var foo = 'bar';

生成一个适合你的列表

• 项目
  • 项目
    • 项目

1. 项目1
2. 项目2
3. 项目3

• 计划任务
• 完成任务

创建一个表格

一个简单的表格是这么创建的：

项目	Value
电脑	$1600
手机	$12
导管	$1

设定内容居中、居左、居右

使用:---------:居中
使用:----------居左
使用----------:居右

第一列	第二列	第三列
第一列文本居中	第二列文本居右	第三列文本居左

SmartyPants

SmartyPants将ASCII标点字符转换为“智能”印刷标点HTML实体。例如：

TYPE	ASCII	HTML
Single backticks	'Isn't this fun?'	‘Isn’t this fun?’
Quotes	"Isn't this fun?"	“Isn’t this fun?”
Dashes	-- is en-dash, --- is em-dash	– is en-dash, — is em-dash

创建一个自定义列表

Markdown

Text-to- HTML conversion tool

Authors

John

Luke

如何创建一个注脚

一个具有注脚的文本。²

注释也是必不可少的

Markdown将文本转换为 HTML。

KaTeX数学公式

您可以使用渲染LaTeX数学表达式 KaTeX:

Gamma公式展示 $\Gamma(n) = (n-1)!\quad\forall n\in\mathbb N$ 是通过欧拉积分

$\Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt\,.$

你可以找到更多关于的信息 LaTeX 数学表达式here.

新的甘特图功能，丰富你的文章

• 关于 甘特图 语法，参考 这儿,

UML 图表

可以使用UML图表进行渲染。 Mermaid. 例如下面产生的一个序列图：:

这将产生一个流程图。:

• 关于 Mermaid 语法，参考 这儿,

FLowchart流程图

我们依旧会支持flowchart的流程图：

• 关于 Flowchart流程图 语法，参考 这儿.

导出与导入

导出

如果你想尝试使用此编辑器, 你可以在此篇文章任意编辑。当你完成了一篇文章的写作, 在上方工具栏找到 文章导出 ，生成一个.md文件或者.html文件进行本地保存。

导入

如果你想加载一篇你写过的.md文件或者.html文件，在上方工具栏可以选择导入功能进行对应扩展名的文件导入，
继续你的创作。

---

1. mermaid语法说明 ↩︎

2. 注脚的解释 ↩︎