Database

create table PendingQueue (
   id int not null,
   DueTime datetime not null,
   Payload varbinary(max),
   cnstraint pk_pending_id nonclustered primary key(id));
    
 create clustered index cdxPendingQueue on PendingQueue (DueTime);
 go
    
 create procedure usp_enqueuePending
   @dueTime datetime,
   @payload varbinary(max)
 as
   set nocount on;
   insert into PendingQueue (DueTime, Payload)
     values (@dueTime, @payload);
 go
    
 create procedure usp_dequeuePending
   @batchsize int = 100,
   @retryseconds int = 600
 as
   set nocount on;
   declare @now datetime;
   set @now = getutcdate();
   with cte as (
     select top(@batchsize) 
       id,
       DueTime,
       Payload
     from PendingQueue with (rowlock, readpast)
     where DueTime < @now
     order by DueTime)
   update cte
     set DueTime = dateadd(seconds, @retryseconds, DueTime)
     output deleted.Payload, deleted.id;
 go

BEGIN TRANSACTION
    
 SELECT @ID=RowID FROM MyTable WITH (ROWLOCK, XLOCK, HOLDLOCK) WHERE ID=6822

I need a real-time database for inserting at least 500fields per second. (I have been selected TimeScaleDB (Postgresql Extension) for my purpose, currently). So, the matrix of the table will be 500(Fields)x86400(Rows).

This means that for a 500 double-precision field it will be around 500*8bytes=4000bytes which for 86400rows it will be 345,600,000bytes (345.6M).

I know a software which it is recording the same structure of data and the final daily volume of its database is only 84M~85M. Its Extension is *.tag so, i think it is a DataFlex database. It is not a free database and i also never used it.

Question:

1- Which free database is the best to use for real-time data storing and querying (at the moment of storing) based on your experience or knowledge?

2- Is there any database to have such a volume or even less for this size of data?

Thank you for your Help.