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From client connection to the database, how can I check which TE I am connected to? 

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In case of a multiple TEs system, a connection to the database using nuosql process will choose the current available TE randomly.

There are two options that could be helpful to understand which TE the client is connected to.

(Option 1) Check ID column in system.nodes table:

$ /opt/nuodb/bin/nuosql <db_name> --user <db_user> --password <db_password>
SQL> select * from system.nodes where localid = 0;                                                                                                                     

 ID  LOCALID  PORT   ADDRESS   HOSTNAME   STATE     TYPE     CONNSTATE  MSGQSIZE  TRIPTIME  GEOREGION  PLATFORM_VER     RELEASE_VER     

 --- -------- ----- ---------- --------- ------- ----------- ---------- --------- --------- ---------- ------------- ------------------ 
  2     0     48007 172.17.0.4 localhost Running Transaction   Ready        0         0         0         1245184    3.4.2-2-44245c06ec 

(Option 2) Use GETNODEID() system function:

SQL> select GETNODEID() from dual;

 GETNODEID
 ----------

  2

From this example, we are currently connected to node ID=2.

More information can be found here and here.

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