Initialization parameter file modification error causes Oracle to fail startup

1. Modify the value of the initialization file as an error

-- error modifying SQL> alter system set db_block_buffers= scope=spfile; SQL> Shutdown immediate database is closed. The database has been uninstalled. The ORACLE routine has been closed. SQL> startupora-00824: Cannot set sga_target or memory_target due to existing internal sett Ingsora-00842: Db_block_buffers cannot is set with Sga_target or Memory_target

2. Generate Pfile files from SPFile

Sql> Create pfile from SPFile; The file has been created. 

3. Open the Pfile file to modify the parameters, *.db_block_buffers=1000 Delete, save.

Sql> Create SPFile from Pfile; The file has been created. SQL>3390558208  bytesfixed size                  2180464  bytesvariable size             1962936976  bytesdatabase buffers         1409286144  Bytesredo buffers                16154624  bytes Database is loaded. The database is already open. 

Initialization parameter file modification error causes Oracle to fail startup