Oracle a modo mio

audit asm su syslog

    alter system set AUDIT_SYS_OPERATIONS=TRUE scope=spfile sid='*';

    alter system set AUDIT_SYS_OPERATIONS=FALSE scope=spfile sid='*';
    alter system set AUDIT_SYSLOG_LEVEL='local0.info' scope=spfile sid='*';

audit database su syslog

   alter system set AUDIT_SYS_OPERATIONS=FALSE scope=spfile sid='*';
   alter system set AUDIT_SYSLOG_LEVEL='local6.info' scope=spfile sid='*';
   alter system set AUDIT_TRAIL='OS' scope=spfile sid='*';

db block checking

alter system set db_block_checking='FULL' scope=spfile sid='*';
alter system set db_block_checksum='FULL' scope=spfile sid='*';

12c undo temp

alter system set temp_undo_enabled=true scope=both sid='*';

default bigfile

alter database set default bigfile tablespace;

checkpoint con SE

Checkpoint ad ogni switch di log:

  select max(BYTES/BLOCKSIZE) from v$log;

   MAX(BYTES/BLOCKSIZE)
   --------------------
	         262144


  alter system set log_checkpoint_interval=262144 scope=both;

Checkpoint almeno ogni 5 minuti

 alter system set log_checkpoint_timeout=600 scope=both;

incrementare SDU e BUF_SIZE

per incrementare SDU bisogna agire sul listener.ora:

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (SDU = 32768)
      (SEND_BUF_SIZE=32768)
      (RECV_BUF_SIZE=32768)
      (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = 2483))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC2483))
    )
  )

Nel database:

  alter system set local_listener='(DESCRIPTION=(SDU=32768)(TDU=32768)(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.1)(PORT=2483)))' scope=both;

expdp consistente

    flashback_time='"to_timestamp_tz(systimestamp)"'

Su Linux

verificare con quale gid girano i processi oracle

 ps axo stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm,group,egroup,rgroup,sgroup,fgroup

 ps -u oracle -o stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm,group,egroup,rgroup,sgroup,fgroup | more

attivare hugepages

in /etc/sysctl.conf (su EL <=5.x) o /etc/sysctl.d/99-oracle.conf (su EL >= 6.x)

    ### Hugepages
    vm.hugetlb_shm_group=54322
    vm.nr_hugepages=1024

disattivare transparent hugepages

disable transparent hugepages https://docs.oracle.com/database/121/CWLIN/memry.htm

[ -f /sys/kernel/mm/redhat_transparent_hugepage/enabled ] && echo never > /sys/kernel/mm/redhat_transparent_hugepage/enabled