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jattwick

I've noticed some weird behaviour with amend entire using lists of lists. The behaviour is different depending on whether on I use a file handle or pass the list directly to the function. Code to recreate is pasted below: weirdPartition:(1 2 3f;();en...

jattwick

The .Q namespace – tools | Reference | kdb+ and q documentation - Kdb+ and q documentation (kx.com) based on this, it seems .q.en[] reads the sym file from disk every time it is called, which would pick up any updates that are coming from other proce...

jattwick

Does KDB automatically lock the sym file when writing to it? I have noticed what seems to be corruption when multiple processes are writing to the sym file at the same time, and was thinking of implementing write locking. However, I am not sure if th...

jattwick

The weird thing for me is we have a process that writes in this fashion, running several times a day. In some cases, it fails (which makes sense given the explanation you have given), but it does work in some cases as well. might lean towards just re...

jattwick

What precisely does at a process level mean? Does that mean only if a single port is multithreading (i.e. peaching and writing to the sym file the lock will be used)? Or I have two distinct ports both writing to the sym file, this built in locking wo...

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Amend Entire Works in memory but not with a handle?

.q.en - does it read the sym file from disk every time?

Sym File Locking

Re: Amend Entire Works in memory but not with a handle?

Re: Sym File Locking