Re: pg full text search very slow for Chinese characters

It is all default values.
I just check maintenance_work_mem and indeed it is 64MB.

At first I gave 2GB ram to docker and later I increased ram to 4GB.
It did not make much difference when ram increased from 2GB to 4GB.

I will try increasing maintenance_work_mem and see if it helps.

发件人: Michael Lewis <mlewis(at)entrata(dot)com>
日期: 2019年9月11日 星期三 上午12:11
收件人: 黄 少君 <jimmy_huang(at)live(dot)com>
抄送: "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>
主题: Re: pg full text search very slow for Chinese characters

>My postgres instance is based on docker image postgres:11 and runs on my MacBook Pro i7 16GB.

How much ram and such did you give to this vm?

>To my surprise, postgres 11 is extremely slow when creating a full text index. I added a column of tsvector type and tried to create an index on that column. Pg could not finish creating a GIN index for a long time and I had to cancel the execution.I then tried to create a partial full text index for 500 rows and it took postgres 2 to 3 minutes to create the index.

Did you customize any config? maintenance_work_mem specifically would be relevant to the time to create an index and default value is only 64MB. Especially if you are running a spinning hard drive and not ssd, then this could be problematic.