hi, expert ,
this issue happened after i initialized the Livecache and restore it back to fix a GATP running issue
but the bad news is this issue come out and that issue not fixed yet 
The detailed information as below
Plz help if you can
thanks so much
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General Connection Data
Connection Name....: LCA
Database Name......: LC2
Database Server....: localhost
tp Profiles........: no_longer_used
DBM User...........: SUPERDBA
Test Scope
1. Execute an external operating system command (DBMCLI)
2. Determine status using TCP/IP connection SAPDB_DBM (DBMRFC command mode)
3. Determine status using TCP/IP connection SAPDB_DBM_DAEMON (DBMRFC session mode)
4. Test the SQL connection (Native SQL at CON_NAME)
Application Server: sapscm_AP1_00 ( Windows NT )
1. Connect. test with "dbmcli db_state" Successful
2. Connect. test with command mode "dbmrfc db_state" Successful
3. Connect. test with session mode "dbmrfc db_state" Successful
4. Connect. test with "native SQL" ( LCA ) No connection
SQL Code: 10709
Connection failed (RTE:[2] too many database sessions active
For detailed information, see the developer trace for work process: 4
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Regards
SL