An inquest into a woman's stabbing murder has been told South Australian police made a "cascade of errors and omissions" in the lead-up to her brutal death at a crowded public function.

Zahra Abrahimzadeh was repeatedly stabbed by her estranged husband Zialloh in 2010 at the Adelaide Convention Centre.

He was jailed for at least 26 years for the killing.

Counsel Assisting the Coroner Naomi Kereru said there were errors and omissions "at almost every point of contact with police".

She said there was no follow-up when alleged threats and assaults were reported to police a year earlier, at the time Mrs Abrahimzadeh and her three children fled the family home.

One of the sons Arman told the court his father would sometimes use a belt, whip or stick to beat his family and once threw his mother through a window.

The inquest continues.