https:\/\/www.dbi-services.com\/blog\/dataguard-wait-events-have-changed-in-12c\/<\/a> I mentioned the new processes NSA for ASYNC transport and NSS for SYNC transport. I’m answering a bit late to a comment about the number of processes: yes there is one NSSn process per LOG_ARCHIVE_DEST_n destination in SYNC and the numbers match.
\n<\/p>\nHere is my configuration with two physical standby:<\/p>\n
DGMGRL> show configuration\n \nConfiguration - orcl\n \n Protection Mode: MaxPerformance\n Members:\n orcla - Primary database\n orclb - Physical standby database\n orclc - Physical standby database\n \nFast-Start Failover: DISABLED\n \nConfiguration Status:\nSUCCESS (status updated 56 seconds ago)<\/code><\/pre>\nBoth are in SYNC:<\/p>\n
DGMGRL> show database orclb logxptmode;\n LogXptMode = 'sync'\nDGMGRL> show database orclc logxptmode;\n LogXptMode = 'sync'<\/code><\/pre>\nI can see two NSS processes:<\/p>\n
DGMGRL> host ps -edf | grep --color=auto ora_nss[0-9]\nExecuting operating system command(s):\" ps -edf | grep --color=auto ora_nss[0-9]\"\noracle 4952 1 0 16:05 ? 00:00:00 ora_nss3_ORCLA\noracle 5322 1 0 16:17 ? 00:00:00 ora_nss2_ORCLA<\/code><\/pre>\nHere are the two log archive dest:<\/p>\n
SQL> select name,value from v$parameter where regexp_like(name,'^log_archive_dest_[23]$');\nNAME VALUE \n---- -----\nlog_archive_dest_2 service=\"ORCLB\", SYNC AFFIRM delay=0 optional compression=disable max_failure=0 max_connections=1 reopen=300 db_unique_name=\"orclb\" net_timeout=30, valid_for=(online_logfile,all_roles)\nlog_archive_dest_3 service=\"ORCLC\", SYNC AFFIRM delay=0 optional compression=disable max_failure=0 max_connections=1 reopen=300 db_unique_name=\"orclc\" net_timeout=30, valid_for=(online_logfile,all_roles)<\/code><\/pre>\nI set the 3rd one in ASYNC:<\/p>\n
DGMGRL> edit database orclc set property logxptmode=ASYNC;\nProperty \"logxptmode\" updated<\/code><\/pre>\nThe NSS3 has stopped:<\/p>\n
DGMGRL> host ps -edf | grep --color=auto ora_nss[0-9]\nExecuting operating system command(s):\" ps -edf | grep --color=auto ora_nss[0-9]\"\noracle 5322 1 0 16:17 ? 00:00:00 ora_nss2_ORCLA<\/code><\/pre>\nI set the 2nd destination to ASYNC:<\/p>\n
DGMGRL> edit database orclb set property logxptmode=ASYNC;\nProperty \"logxptmode\" updated<\/code><\/pre>\nThe NSS2 has stopped:<\/p>\n
DGMGRL> host ps -edf | grep --color=auto ora_nss[0-9]\nExecuting operating system command(s):\" ps -edf | grep --color=auto ora_nss[0-9]\"<\/code><\/pre>\nNow starting the 3rd destination first:<\/p>\n
DGMGRL> edit database orclc set property logxptmode=SYNC;\nProperty \"logxptmode\" updated<\/code><\/pre>\nI can see that nss3 has started as it is the log_archive_dest_3 which is in SYNC now:<\/p>\n
DGMGRL> host ps -edf | grep --color=auto ora_nss[0-9]\nExecuting operating system command(s):\" ps -edf | grep --color=auto ora_nss[0-9]\"\noracle 5368 1 0 16:20 ? 00:00:00 ora_nss3_ORCLA<\/code><\/pre>\nThen starting the second one:<\/p>\n
DGMGRL> edit database orclb set property logxptmode=SYNC;\nProperty \"logxptmode\" updated<\/code><\/pre>\nHere are the two processes:<\/p>\n
\nDGMGRL> host ps -edf | grep --color=auto ora_nss[0-9]\nExecuting operating system command(s):\" ps -edf | grep --color=auto ora_nss[0-9]\"\noracle 5368 1 0 16:20 ? 00:00:00 ora_nss3_ORCLA\noracle 5393 1 0 16:20 ? 00:00:00 ora_nss2_ORCLA<\/code><\/pre>\nSo if you see some SYNC Remote Write events in ASH, look at the program name to know which destination it is.<\/p>\n","protected":false},"excerpt":{"rendered":"
By Franck Pachot . In a previous post https:\/\/www.dbi-services.com\/blog\/dataguard-wait-events-have-changed-in-12c\/ I mentioned the new processes NSA for ASYNC transport and NSS for SYNC transport. I’m answering a bit late to a comment about the number of processes: yes there is one NSSn process per LOG_ARCHIVE_DEST_n destination in SYNC and the numbers match.<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[198],"tags":[1122,221,96,209],"type_dbi":[],"class_list":["post-10248","post","type-post","status-publish","format-standard","hentry","category-database-management","tag-data-gard","tag-data-guard","tag-oracle","tag-oracle-12c"],"acf":[],"yoast_head":"\n
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