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DB-GPT/docs/docs/faq/kbqa.md

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KBQA FAQ
==================================
##### Q1: text2vec-large-chinese not found
make sure you have download text2vec-large-chinese embedding model in right way
```tip
centos:yum install git-lfs
ubuntu:apt-get install git-lfs -y
macos:brew install git-lfs
```
```bash
cd models
git lfs clone https://huggingface.co/GanymedeNil/text2vec-large-chinese
```
##### Q2:How to change Vector DB Type in DB-GPT.
Update .env file and set VECTOR_STORE_TYPE.
DB-GPT currently support Chroma(Default), Milvus(>2.1), Weaviate vector database.
If you want to change vector db, Update your .env, set your vector store type, VECTOR_STORE_TYPE=Chroma (now only support Chroma and Milvus(>2.1), if you set Milvus, please set MILVUS_URL and MILVUS_PORT)
If you want to support more vector db, you can integrate yourself.[how to integrate](https://db-gpt.readthedocs.io/en/latest/modules/vector.html)
```commandline
#*******************************************************************#
#** VECTOR STORE SETTINGS **#
#*******************************************************************#
VECTOR_STORE_TYPE=Chroma
#MILVUS_URL=127.0.0.1
#MILVUS_PORT=19530
#MILVUS_USERNAME
#MILVUS_PASSWORD
#MILVUS_SECURE=
#WEAVIATE_URL=https://kt-region-m8hcy0wc.weaviate.network
```
##### Q3:When I use vicuna-13b, found some illegal character like this.
<p align="left">
<img src="https://github.com/eosphoros-ai/DB-GPT/assets/13723926/088d1967-88e3-4f72-9ad7-6c4307baa2f8" width="800px" />
</p>
Set KNOWLEDGE_SEARCH_TOP_SIZE smaller or set KNOWLEDGE_CHUNK_SIZE smaller, and reboot server.
##### Q4:space add error (pymysql.err.OperationalError) (1054, "Unknown column 'knowledge_space.context' in 'field list'")
1.shutdown dbgpt_server(ctrl c)
2.add column context for table knowledge_space
```commandline
mysql -h127.0.0.1 -uroot -p {your_password}
```
3.execute sql ddl
```commandline
mysql> use knowledge_management;
mysql> ALTER TABLE knowledge_space ADD COLUMN context TEXT COMMENT "arguments context";
```
4.restart dbgpt serve
##### Q5:Use Mysql, how to use DB-GPT KBQA
build Mysql KBQA system database schema.
```bash
$ mysql -h127.0.0.1 -uroot -p{your_password} < ./assets/schema/knowledge_management.sql
```