db2 how to configure external tables using extbl_location, extbl_strict_io - db2

Question

db2 how to configure external tables using extbl_location, extbl_strict_io. Could you please give insert example for system table how to set up this parameters. I need to create external table and upload data to external table.
I need to know how to configure parameters extbl_location, extbl_strict_io.
I created table like this.
CREATE EXTERNAL TABLE textteacher(ID int, Name char(50), email varchar(255)) USING ( DATAOBJECT 'teacher.csv' FORMAT TEXT CCSID 1208 DELIMITER '|' REMOTESOURCE 'LOCAL' SOCKETBUFSIZE 30000 LOGDIR '/tmp/logs' );
and tried to upload data to it.
insert into textteacher (ID,Name,email) select id,name,email from teacher;
and get exception [428IB][-20569] The external table operation failed due to a problem with the corresponding data file or diagnostic files. File name: "teacher.csv". Reason code: "1".. SQLCODE=-20569, SQLSTATE=428IB, DRIVER=4.26.14
If I correct understand documentation parameter extbl_location should pointed directory where data will save. I suppose full directory will showed like
$extbl_location+'/'+teacher.csv
I found some documentation about error
https://www.ibm.com/support/pages/how-resolve-sql20569n-error-external-table-operation
I tried to run command in docker command line.
/opt/ibm/db2/V11.5/bin/db2 get db cfg | grep -i external
but does not information about external any tables.

Answer 1

CREATE EXTERNAL TABLE statement:
file-name
...
When both the REMOTESOURCE option is set to LOCAL (this is its default value) and the extbl_strict_io configuration parameter is set
to NO, the path to the external table file is an absolute path and
must be one of the paths specified by the extbl_location configuration
parameter. Otherwise, the path to the external table file is relative
to the path that is specified by the extbl_location configuration
parameter followed by the authorization ID of the table definer. For
example, if extbl_location is set to /home/xyz and the authorization
ID of the table definer is user1, the path to the external table file
is relative to /home/xyz/user1/.
So, If you use relative path to a file as teacher.csv, you must set extbl_strict_io to YES.
For an unload operation, the following conditions apply:
If the file exists, it is overwritten.
Required permissions:
If the external table is a named external table, the owner must have read and write permission for the directory of this file.
If the external table is transient, the authorization ID of the statement must have read and write permission for the directory of this file.
Moreover you must create a sub-directory equal to your username (in lowercase) which is owner of this table in the directory specified in extbl_location and ensure, that this user (not the instance owner) has rw permission to this sub-directory.
Update:
To setup presuming, that user1 runs this INSERT statement.
sudo mkdir -p /home/xyz/user1
# user1 must have an ability to cd to this directory
sudo chown user1:$(id -gn user1) /home/xyz/user1
db2 connect to mydb
db2 update db cfg using extbl_location /home/xyz extbl_strict_io YES