7 Essential Differences Between Search and Search All in COBOL Every Programmer

Difference Between Search and Search All — if you have ever written any lines of code in COBOL, you may have Googled this once or twice.
And for real?
Same here.

Difference Between Search and Search All is one of those topics that seems easy at first… and then isn’t. When I first learned COBOL, I would mix them up so often that my mentor joked I had some secret love for debugging infinite loops. 😅

So in this article, I’m going to break it all down in the most human way, friendly way that I can — with real examples, relatable insights, and usable explanations.
My hope?
By the end of this, you will never again mix up Search and Search All.

⭐  Key Highlights of this Article

•  Clearly know the Difference Between Search and Search All
•  Learn when to use Search and when to use Search All
•  Use short code-reading snippets from my own journey learning COBOL
•  Reads like you’re talking to a friend – easy to read code example explanations
•  Clear explanations of linear search vs binary search

Distinguishing Between Search and Search All in COBOL – What You Truly Need to Understand

When somebody asks for a distinction between Search and Search All, what they normally want is really simple:
– “Just tell me the difference.”
– “Just tell me when I use which one.”
– “Give me an explanation as if I am not a walking compiler.”

So, let me get this out of the way right now.
Search = linear search
Search All = binary search

That’s the bottom line.
But of course, it’s COBOL. Nothing is ever that brief. So let’s try to go deeper in a way that makes some sense.

Differences Between Search and Search All in COBOL You Can’t Ignore

1. What does SEARCH do in COBOL? (Includes the main keyword 😄)

SEARCH is the most straightforward way to search an array in COBOL. It executes a linear search, which essentially means:

• Start from the first element
•  All elements should be checked, one at a time
• Stop when the value is found!

This is like looking at your contacts list without using the search bar.

When I first started, I used SEARCH everywhere because it’s predictable. Slow, yes — but predictable.

Example Code (SEARCH)

SEARCH ARR
    AT END DISPLAY "NOT FOUND"
    WHEN RNO(I) = SEARCHRNO
        DISPLAY "FOUND ROLL NUMBER"
END-SEARCH.

Real-life example:

I once used SEARCH to find a student’s roll number from a 10-record table my instructor gave me.
Was it fast? No.
Did it work well for small data? Absolutely.

2. What does SEARCH ALL mean in COBOL? (Secondary Keyword Inside 😉)

Now, let’s cover the “faster brother” in the Search and Search All family — SEARCH ALL.

• SEARCH ALL is doing a binary search.
• And binary search is FAST. Like really fast.

  

Binary search works like this:

• Look at the middle element
• If it’s smaller, look at the right side
• If it’s bigger, look at the left side
• Repeat until you find it
• It cuts the search space in half every single time.

Example Code (SEARCH ALL)

SEARCH ALL ARR
    AT END DISPLAY "NOT FOUND ROLL NUMBER"
    WHEN RNO(I) = SEARCHRNO
        DISPLAY "FOUND ROLL NUMBER"
END-SEARCH.

3. Differences Between Search and Search All

Now let’s go through the real Differences Between Search and Search All, in a clean table that you can bookmark, screenshot, or tattoo (just kidding… or am I? 😅).

SEARCH	SEARCH ALL
Performs linear search	Performs binary search
Works on unsorted data	Works only on sorted data
Slower for large tables	Much faster for large tables
Supports multiple WHEN conditions	Allows only equality condition
Requires SET index before starting	No need to SET index
Works on multi-dimensional arrays	Only works on one-dimensional arrays
Easy to use	Requires sorted data & careful coding

Slightly different wording, on all the things above, outlines yet again There’s a Difference Between Search and Search All.

4. When to Use Which?

Use SEARCH when:

• Your table is not sorted
• You want simple, readable logic
• You have lots of conditions (i.e. if statements)
• Performance is not a concern

Use SEARCH ALL when:

• Your table is sorted
• You want speed
• You are searching thousands of records
• You want fewer loops

Whenever I design code for legacy COBOL systems, I frequently notice Search and Search All apart. Most of the time, is just developers choosing SEARCH ALL, simply because it is quicker.
But speed matters only statement-hooks if data is sorted and is large enough.

 5. Real Example From my Project Performance

I used to work on a banking project where we searched customer IDs thousands of times a day.
The previous version of the code used SEARCH, and searched so slow, it literally lagged like an overloaded school computer.
When I switched the logic to SEARCH ALL, I of course first sorted the table, and kept sorting the data.
It is needless to say, I succeeded.

• The search time went form 8 seconds to less than 1 second.
• My team lead said “You just saved us a week of maintenance”.
• I finally understood what the Difference Between Search and Search All is, in the real world.

6. An Easy Analogy to Illustrate it Further

Searching using SEARCH is like:

•  Looking at every item on your grocery list one-by-one, walking up and down each aisle looking for every item.

Searching using SEARCH ALL is like:

•  Asking the store employee: “Hey, where is the sugar?”
  And then the employee directs you right to the aisle.

Both work.
But one is vastly more efficient.

 7. Resources

📘 Internal Links

• COBOL Arrays Tutorial
• Linear Search vs Binary Search
• COBOL Indexed Tables

🌍 External Links

• IBM COBOL Documentation: https://www.ibm.com/docs
• Tutorialspoint COBOL: https://www.tutorialspoint.com/cobol

These resources will help you to build much more knowledge beyond just the Difference Between Search vs Search All.

🎯Final Thoughts – My Honest Advice

If you are learning (or preparing for an interview) about COBOL, please engrain this in your brain:

• SEARCH = linear search, slow, unsorted, and flexible to your values
• SEARCH ALL = binary search, fast, sorted, and strict about using your values

I have been utilizing Search and Search All in practice for a long time, and the Difference Between Search and Search All is, without a doubt, one of the most basic, yet … powerful concepts in COBOL when it “clicks.”

Use properly.
Use it knowingly.
And hey, now you can explain this better than half of the programmers out there.