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What does the w dictionary look like in a tick set up?
init:{w::t!(count t::tables`.)#()}
I know w begins life as a dictionary with the keys being the symbols of the table names and the values being empties: ()
What does the w dictionary look like after the tickerplant runs, subscribers join etc?
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1 Reply
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The .u.w dictionary is a dictionary of table names and (handle;subscribed syms). Timestored have a tutorial on tick with the example:
q).u.w
quote | ()
trade | ,(396;`IBM`AA )Here there is one subscription to the trade table for the `IBM and `AA symbols on handle 396 and no subscriptions to the quote table. The link to the Timestored tutorial is here:
Kdb Tick Data Storage Kdb+ Tutorials (timestored.com)Here’s a guide to helping start kdb+ tick:
Realtime database Starting kdb+ Learn kdb+ and q documentation – Kdb+ and q documentation (kx.com)
It may be beneficial for you to try starting tick with a couple of different rdb processes and try different variations using .u.sub. In standard tick the rdb subscribes to all tables and all syms, using .u.sub[ ` ; ` ], but you can change this to subscribe to specific tables/syms. The first argument is the table name the second is the list of syms you want to subscribe to. For the example above it would look like:
.u.sub[`trade;`IBM`AA]
It may be helpful for you to see for yourself.Hope that helps.
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