Database and Query Tuning
As tables grow from thousands to lakhs of rows, queries that were once instant start taking seconds. GullySystem finds the specific queries responsible and rewrites, indexes or restructures them without disrupting the live database.
Why Queries Slow Down as Data Grows
A query that scans every row in a table is unnoticeable at a few thousand rows and painful at a few lakh. Nothing needs to have broken for this to happen — the data simply grew past what the original query was ever tested against, and it keeps degrading quietly until someone measures it.
What We Look At
Slow Query Logs
Real queries from your working hours, ranked by total time consumed rather than by the single slowest example, since a query run many times can cost more overall than one slow query run rarely.
Execution Plans
How the database actually resolves each query, which shows whether it is reading the whole table, using the wrong index, or the right index in the wrong order.
Schema and Relationships
Table structure, missing constraints and relationships that force the application to do work the database should be doing instead.
Locking and Contention
Cases where one long-running query blocks others from proceeding, which shows up as random slowness rather than a consistently slow screen.
Changes We Make
- Adding indexes chosen from the execution plan, not guessed at
- Rewriting queries that request more data or more joins than the screen displays
- Archiving or partitioning old data that the application rarely needs to read
- Replacing queries run in a loop with a single query for the whole batch
- Adjusting connection pool and timeout settings to match real concurrency
Doing This Without Taking the Database Down
Index changes and schema updates are tested on a copy of the database first, and where a change must run on the live database, it is scheduled and run in a way designed not to lock tables your application is actively using. You are told in advance if any step carries even a small risk, rather than discovering it afterwards.
Which Databases This Covers
- MySQL and MariaDB
- PostgreSQL
- Microsoft SQL Server
- MongoDB and other document stores
Frequently asked questions
Is database tuning the right fix if a screen is slow for other reasons too?
It only helps the portion of slowness the database is actually causing. If tracing shows the delay is in application code or an external service instead, tuning the database will not fix that part, which is why we confirm the database is genuinely the bottleneck before starting rather than assuming it because it is often blamed first.
What determines how much query tuning costs?
How many distinct slow queries are involved and whether the cause is isolated to a few queries or built into how the schema itself is designed. A missing index is quick and inexpensive to add; a schema redesign for a table that grew far beyond its original purpose costs more.
What determines how long query tuning takes?
How large the tables already are, and whether the cause is isolated to a few queries or built into how the schema itself is designed. A missing index is quick; a schema redesign for a table that grew far beyond its original purpose takes longer.
Can you tune a database you did not design?
Yes, this is most of the work. We read the schema and query patterns as they exist today rather than requiring the original developer, and any change we make is documented so whoever maintains the database next understands why it was made.
Who owns the changes made to our database and schema?
You do. Every index, query rewrite and schema change is applied directly to your own database and documented, so your own team or a future vendor can see exactly what changed and why.
What do you need from us before query tuning starts?
Read access to the database and slow query logs if logging is already enabled, and a list of the screens or reports that feel slowest — full administrative access is useful but not always required, and we work with whatever access your hosting or DBA team can provide.
Can this be done without taking our database offline?
In almost every case, yes. Index creation on most databases can run without locking the table, and riskier changes are tested on a copy first and scheduled for a low-traffic window if any brief interruption is possible.
Tell us what you need.
Send a short brief and one of our engineers will come back to you — usually the same day.
- No obligation
- We reply the same working day
- Your details stay private