Perhaps I am not understanding your need. What I am reading is that you make changes to your client records (without naming the table that contains the clients)  and...

You would want an Explicit transaction if you were doing an operation , for example, on two tables in a way that they both need to maintain integrity. For example...

To add to the question on losing a connection that may be in a transaction,

We have had site down maintenance and to where the network is just brought down. The...

It sounds like there is a particular index that may be taking a lot longer and blocking the processing of others , especially if you set a time limit on...

It is better to not just designate an arbitrary integer as your clustering index. But instead consider how the table will join to other tables and be filtered.

If you are...

Aside from what been said, If your data has changed then see if you need to update index stats especially on your heavily used tables.

What ever your rules for matching are , For example address matching, you will need to join the table with itself. Something like  ? >

Select t1.custNo, t2.*,...

ALTER TABLE test_table
ADD CONSTRAINT test_table_R01 FOREIGN KEY (parent_id)
REFERENCES test_table (table_id);

Seems to me that the first row can only reference itself, so would have to watch the order...

Are you lookging for something like

SELECT
       CONCAT(s1.Product_code, s2.serialNumber) as newProductCode
       s2.SerialNumber
    ...

Are you lookging for something like

SELECT
       CONCAT(s1.Product_code, s2.serialNumber) as newProductCode
       s2.SerialNumber
    ...

"Select emp.vid,pt,dn,dcode,dcat,dtime,dlocation "

IF you are selecting all the columns from just your base table, and non from the other join tables,  you could try removing the joins and instead employ ...

Thus every row will have this 14 bytes of extra storage , regardless if that row gets updated later?

Defintley looks like this was ChatGpt assisted at the least. Very non specific and lacking use cases.

Having that extra lookup table with unecrypted data will no doubt mean it will require extra column level security at the least. Preventing unauthorized access will be the primary importance.

I have to wonder about moving tables from one schema to another and how that would impact applications accessing established data. I imagine a synonym coming into the equation at...