Why Backlink Databases Can Never Be Fully Accurate

Backlink databases can never be fully accurate since there is no way for a crawler to discover, process and update the whole Internet at once. The Internet moves too fast, grows too much and shifts too frequently for any backlink database to match the actual environment accurately all the time.

This problem is permanent by nature.

Regardless of the size, any backlink database works via an imperfect web discovery framework that attempts to capture the changing environment continuously.

Why Internet Changes Faster Than Backlink Databases Can Stabilize

The Internet is anything but static.

New pages get created; pages disappear; sites undergo redirects; pages get updated; links get removed; pages get placed behind various kinds of restrictions; pages have their internal structures changed; etc.

These processes occur every day, every minute and every second on millions of websites around the world.

Thus, backlink databases operate in a state of constant catching up.

If a crawler discovers a backlink one day, the page may get changed before another crawler finds out about the modification. Some links will be lost while they get discovered. Other pages will become temporarily unavailable because of server problems, restrictive access, problematic rendering or other reasons.

All this makes backlink databases inherently unstable.

It does not mean that there is necessarily a problem with the database itself, although the actual state of the web environment continues to shift underneath.

Why a Crawler Cannot Fully Map the Live Internet Constantly

Backlink databases totally depend on crawlers.

To be completely accurate, a crawler would need to discover every page instantaneously, keep checking all pages constantly, process everything instantly, render dynamic environments perfectly and have an infinite amount of storage space.

But this is not practically possible at the current level of technology, especially if we speak about the Internet in general.

The Internet consists of billions of pages and environments, some of which are extremely isolated from others, have poor discoverability features or render dynamically.

Moreover, pages can appear for a relatively brief period of time and then be removed.

Therefore, crawlers have to prioritize where they allocate their resources.

As a result, portions of the Internet remain unseen, delayed or temporarily outdated within the context of backlink databases.

Incomplete Crawling Leads To Permanent Database Gaps

Any backlink database contains gaps in terms of crawled pages.

There will always be some pages whose crawling is particularly complicated due to the fact that the pages are located deep within site structures, depend heavily on JavaScript rendering, get updated randomly, have poor discoverability features or are intentionally restricted.

Even the most sophisticated crawlers cannot maintain constant visibility across the whole Internet.

The consequence is an inherent gap:

no backlink database is ever able to discover 100% of the Internet.

It might seem that the percentage of uncrawled backlinks is tiny from the overall web perspective. Yet at the global Internet scale, even a tiny percentage means tremendous amounts of missing or partially indexed backlinks.

This is something that comes with the territory of large-scale web crawling.

Temporary Link States Affect Database Accuracy

There is always a chance that backlinks appear in transitional states.

For example, this can happen during site migration, staging deployment, content syndication, changes of dynamic rendering environments, caching problems, the existence of short-lived pages or various states of partial indexing.

There are cases when links remain present long enough to be detected by some crawlers while disappearing before another crawler checks the page.

Sometimes links get temporarily recorded in a database while already having disappeared from the live page itself.

It means there will be many inaccuracies such as missing links, outdated links, temporary inactive references, delayed deletion or partial synchronization.

These are normal consequences of attempting to capture a constantly shifting web environment.

Backlink Databases Are Approximations, Not Perfect Inventories

Many people think of backlink databases as exact copies of the Internet itself.

Actually, backlink databases should rather be considered approximations of the Internet environment.

Backlink databases constantly evolve, expand and improve. But at the same time, they can never stabilize completely because the environment they are supposed to describe changes constantly as well.

That is the reason for continuous fluctuations of link counts even if nothing major happens to your website.

Backlink databases constantly adjust themselves to new discoveries, disappearance of some pages, page rechecks, various processing delays, changes of crawling priorities and changes of web environments.

Perfection would require the Internet to stop changing long enough to be captured completely by a crawler.

But that never happens.

Why Backlink Database Imperfection Is Inevitable

Backlink databases cannot ever become perfect because of the very nature of the Internet being too large, complex and dynamic.

Each crawler faces infrastructure limitations, partial visibility, changing web environments and many other constraints. As a result, backlink databases operate as permanently shifting representations of the Internet.