Solution : https://service.sap.com/sap/support/notes/617416 (SAP Service marketplace login required)
Key words : 
sql>show sgatotal system global area                  135339268 bytesfixed size                                    453892 bytesvariable size                              109051904 bytesdatabase buffers                          25165824 bytesredo buffers                                667648 bytessql>, sql>show parameter db_block_buffers  sql>show parameter buffer_pool_keep   sql>show parameter buffer_pool_recyclenew parameters, sql>show parameter sga_max_size   sql>show parameter cache_size   sql>show parameter statistics_level2, sql>show parameter db_block_buffers  sql>show parameter buffer_pool_keep   sql>show parameter buffer_pool_recyclethe, current settings   sql>show sga   sql>show parameter db_block_sizeold parameters, sql>show parameter buffer_pool_keep  sql>show parameter buffer_pool_recycle  set, sga parameter   sql>alter system reset buffer_pool_keep scope = spfile sid=' ', sysdba   sql>shutdown   sql>startup   sql>show sgathe, sql>show parameter sga_max_size   sql>show parameter db_cache_sizethe, typical   sql>alter system set statistics_level='typical' scope = spfile
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