Oracle数据库需要关注的几个参数

ALTER SYSTEM SET processes=1000 SCOPE=SPFILE;
ALTER SYSTEM SET sessions=1105 SCOPE=SPFILE;
ALTER SYSTEM SET cursor_sharing='similar' SCOPE=BOTH;
ALTER SYSTEM SET filesystemio_options='setall' SCOPE=SPFILE;
asynch:启用异步I/O
directio:启用同步I/O
setall:同时启用异步和同步I/O
none:禁用异步和同步I/O
ALTER SYSTEM SET db_writer_processes=32 SCOPE=SPFILE;
optimizer_mode     string      ALL_ROWS
alter  system  set  optimizer_mode = first_rows  ;
alter system set open_cursors=1000 scope=both;