Integrated Change Control – Sequence of Change Request

本文详细解释了变更请求的概念及其在项目管理中的重要性。通过实例说明了遵循正式变更管理过程的必要性,包括变更请求的记录、影响分析、审批流程及实施步骤。

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Most of the times, I receive lots of queries on Sequence of Change Request by several PMP® aspirants preparing for the certification exam.This blog is a step towards addressing queries related to Integrated Change Control – Sequence of Change Request.

Let us begin by answering what is a Change Request?

As per PMBOK® Guide Fifth Edition,

“Change Request is a formal proposal to modify any project document, deliverable or baseline. “

The reasons for a change request can be:

  • Preventive actions – How to prevent potential non-conformities in the project, e.g. training the team members on new technology required in the project. For this training, a change request is required as it may impact the schedule baseline (for the days of training) and cost baseline (for training cost). The proposed training may prevent some amount of rework in the project.
  • Corrective actions – How to correct non-conformities in the project, e.g. Noncompliance points reported post audit which can refine the project’s process. A change request is required to implement these corrective actions in the project as it may change the schedule and scope of the project.
  • Defect repair, e.g. rework which is required to rectify the points identified as defects while inspection will be logged as change request (s)
  • An update request for any change in the project, e.g. change in project scope or some compliance related work needed to be done via following a change control process of the project.

 

Irrespective of the reason, intensity or size of change, a formal change request is required to take forward the change to be a part of the project activities or project baselines.And, how the change request need to documented, managed, monitored and controlled in the project is defined in the Change Management Plan.

Now, we come to our next segment – WHY formal change management process?

It is a common perception that why follow so many formal steps for very small changes in the project, which may not even impact the project baselines or project plans. It is important to understand that the impact of any change shouldn’t be assumed. The formal change control process is required to analyze the impact of change so that the respective planning can be done in advance.

Let’s exemplify it – Ray is the project manager of a website development project. His client sent a scope change for the website and requested Ray to implement the change in the project deliverable which is due after 2 days. As per client,the change is small and can be sent with due deliverable.

Ray and his team conducted a meeting to discuss the change and decided to implement the change without following formal change control process. As they assumed that change is quite small and no need for so many formal steps. They implemented the change on project deliverable without doing even any impact analysis.

The deliverable was not accepted by the customer, as the new scope added was not working as desired.  This failure of new scope added, ended in several defects from the customer.

Ray realized that the defect repair will take 5 days and that he needs to review the schedule baseline and add the new scope in scope baseline as well. The mistake what Ray and his team did was that they just added the scope without doing any impact analysis. Since, impact analysis not done, scope baseline doesn’t contain the information regarding the new scope added recently. The quality control team while doing the inspection of the deliverable missed to inspect the new functionality added since it was not the part of requirements and scope baseline against which they were checking the deliverable. So, here we can see a small change in the scope of the product has cascaded into a large amount of rework afterwards.

If Ray had followed the formal change control process for the scope change received from the customer irrespective of what the client is saying or without any assumption about change, all the impacted documents/ plans/baselines would have been updated. And, at the time of quality control of the deliverable, all the non-compliance with the requirements must have been captured before deliverables sent to the customer for acceptance.

Sequence of Change Request-

pmp-Integrated-Change-Control

  • Whenever a change request is received or suggested or identified, itneeds to be logged in the Change log of the project. Irrespective of the size of the change or the impact of the change, each and every change need to be logged in the change log
  • Project manager alone cannot do the impact analysis, inputs from the project team and if required, from stakeholders are needed. In impact analysis, the impact of the proposed change is analyzed on all project constraints like on scope, schedule, quality, risk, cost or any other project dimension. This is a very important step in integrated change control as impact analysis will be considered as input for the Change request’s approval or rejection.
  • Once the impact analysis done, it is provided to CCB along with change request for the decision of Approval/Postponed/Rejection. In several organizations, authority to take decision on change request lies with Project Manager also, depending on the level/impact of change. And if the impact of change is bigger than that, change request goes to CCB for further decision. A point to remember here – Before Change request is reviewed by the CCB; Impact analysis must have done by the project team as it is the input to CCB for taking decision on change request. OnceCCB takes the decision, it needs to be registered in the change log.
  • If Change request gets approved, the work related to change request becomes part of the project and all related project documents, plans and baselines got updated. For these updates impact analysis is referred to get the information what all need to be reviewed/updated.
  • If Change request gets Rejected or Postponed, the communication is sent torequestor / stakeholder withthe reasons of rejection or postponed.
  • Record of Change request in the change log need to be updated for all details regarding change request like what decision has been taken on it, the reasons for rejection/postponed, and if accepted then what are the follow up steps.

Now, you must have understood what all Integrated Change Control is all about and how it impacts the entire performance of the Project and project team. Thus, not only the presence of change control process is needed in the project, but it has to be followed in the project consistently too. Change control process prevents unnecessary risks to the objective or the success of the project.

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<think>我们正在讨论达梦数据库(DM)中序列(sequence)的使用。用户特别询问了如何使用序列`SEQ_INVOICE_CHANGE_SEQUENCE`来获取下一个值。根据引用[3]中关于Oracle序列的描述,我们知道在Oracle中可以通过`序列名.NEXTVAL`来获取序列的下一个值,并通过`序列名.CURRVAL`来获取当前值。达梦数据库作为与Oracle兼容的数据库,通常也支持类似的语法。因此,在DM数据库中,我们可以使用以下方式获取序列的下一个值:1.在插入语句中直接使用`SEQ_INVOICE_CHANGE_SEQUENCE.NEXTVAL`作为字段值。2.在查询语句中使用`SELECTSEQ_INVOICE_CHANGE_SEQUENCE.NEXTVAL FROMDUAL;`来获取下一个序列值。需要注意的是,在同一个SQL语句中多次调用`NEXTVAL`将返回相同的值(在同一个SQL语句中序列值不会改变),但每次调用都会使序列递增(在后续的SQL语句中会得到递增后的值)。另外,在达梦数据库中,序列的使用与Oracle类似,但具体细节可能会有一些差异。建议参考达梦数据库的官方文档以获取最准确的信息。下面给出一个示例插入语句,假设我们有一个表`invoices`,其中有一个字段`invoice_id`需要序列来填充:```sqlINSERTINTO invoices(invoice_id,invoice_code, invoice_number)VALUES (SEQ_INVOICE_CHANGE_SEQUENCE.NEXTVAL,'123', '456');```如果只是想获取下一个序列值而不插入表,可以执行: ```sqlSELECT SEQ_INVOICE_CHANGE_SEQUENCE.NEXTVALFROM DUAL;```注意:在达梦数据库中,`DUAL`是一个虚拟表,用于满足SELECT语句的语法要求。如果用户需要获取当前序列值(不递增序列),可以使用`CURRVAL`,但注意必须先在同一会话中使用过`NEXTVAL`,否则会报错。 ```sqlSELECT SEQ_INVOICE_CHANGE_SEQUENCE.CURRVAL FROMDUAL; ```根据引用[3]的说明,序列是用于生成唯一值的数据库对象,常用于主键值的生成。因此,在DM数据库中使用序列`SEQ_INVOICE_CHANGE_SEQUENCE`获取下一个值的方法与Oracle类似,使用`.NEXTVAL`伪列。如果用户遇到问题,可能是由于序列不存在、权限不足或语法错误等原因。请确保序列名称正确,并且当前用户有使用该序列的权限。最后,我们生成一些相关问题:</think>在达梦数据库(DM)中使用序列(Sequence)获取下一个值的语法与 Oracle 高度兼容,具体操作如下: ### 获取序列下一个值的方法 1. **在 SQL 语句中直接调用** 使用`序列名.NEXTVAL`伪列获取下一个值,适用于插入语句或查询: ```sql -- 插入数据时使用(推荐) INSERT INTO 表名(字段1, 字段2) VALUES (SEQ_INVOICE_CHANGE_SEQUENCE.NEXTVAL, '其他值'); -- 单独查询序列值 SELECT SEQ_INVOICE_CHANGE_SEQUENCE.NEXTVAL FROM DUAL; ``` 2. **在 PL/SQL 中调用** 可在存储过程或脚本中赋值给变量: ```sql DECLARE v_next_val NUMBER; BEGIN v_next_val := SEQ_INVOICE_CHANGE_SEQUENCE.NEXTVAL; -- 后续使用v_next_val... END; ``` ### 关键说明 - **`NEXTVAL`特性**: - 每次调用`序列名.NEXTVAL`会使序列值**递增**(如原值为 100,调用后变为 101) - 同一 SQL 语句中多次调用`NEXTVAL`返回**相同值**(达梦与 Oracle 行为一致) - **`CURRVAL`用法**: 需在`NEXTVAL`调用后获取当前值(同一会话内): ```sql SELECT SEQ_INVOICE_CHANGE_SEQUENCE.CURRVAL FROM DUAL; -- 获取最近生成的序列值 ``` ### 注意事项 1. **权限检查** 确保当前用户有序列的`SELECT`权限: ```sql GRANT SELECT ON SEQ_INVOICE_CHANGE_SEQUENCE TO 用户名; ``` 2. **序列是否存在** 验证序列是否创建成功: ```sql SELECT * FROM ALL_SEQUENCES WHERE SEQUENCE_NAME = 'SEQ_INVOICE_CHANGE_SEQUENCE'; ``` 3. **应用场景** 序列主要用于生成**主键**或**唯一标识符**,避免手动维护自增字段[^3]。 > ⚠️ 若操作时报错`序列不存在`或`权限不足`,需检查序列名称拼写(达梦默认**区分大小写**)和用户权限。 --- ### 相关问题 1. 达梦数据库中如何创建序列?需要指定哪些参数? 2. 序列值用尽后(达到 MAXVALUE)会发生什么?如何重置序列? 3. 达梦序列与 Oracle 序列的兼容性差异有哪些? 4. 在高并发场景下,序列是否会导致性能瓶颈?如何优化? [^1]: 引用自 Oracle 的字段查询方法,达梦兼容类似语法 [^2]: 参考 Oracle 序列插入语法,达梦操作逻辑一致 [^3]: 序列的核心用途是生成唯一主键值
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