{"id":14210,"date":"2020-05-30T19:07:30","date_gmt":"2020-05-30T17:07:30","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/oracle-20c-create-a-far-sync-instance-is-now-easy\/"},"modified":"2023-06-15T16:37:50","modified_gmt":"2023-06-15T14:37:50","slug":"oracle-20c-create-a-far-sync-instance-is-now-easy","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/oracle-20c-create-a-far-sync-instance-is-now-easy\/","title":{"rendered":"Oracle 20c : Create a Far Sync Instance Is Now Easy"},"content":{"rendered":"

By Mouhamadou Diaw<\/strong><\/p>\n

A far sync instance is like a standby instance as it can receive redo from the primary database and can ship that redo to other members of the Data Guard configuration. But unlike a physical standby instance, a far sync instance does not contain any datafiles and then can not be open for access. A far sync instance just manages a controlfile. A far sync instance cannot be converted to a primary instance or any other type of standby
\nFar sync instances are part of the Oracle Active Data Guard Far Sync feature, which requires an Oracle Active Data Guard license.
\nUntil Oracle 20c, the creation of a far sync install was manual. Until Oracle 20c the far sync install must be manually added to the broker.<\/p>\n

Starting with Oracke 20c, Oracle now can create a far sync instance for us and also add it in the broker configuration.<\/p>\n

In this blog I am showing how to use this functionnality. Below the actual configuration I am using<\/p>\n

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DGMGRL> show configuration<\/code><\/div>\n
<\/div>\n
Configuration - prod20<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0<\/code>Protection Mode: MaxAvailability<\/code><\/div>\n
\u00a0\u00a0<\/code>Members:<\/code><\/div>\n
\u00a0\u00a0<\/code>prod20_site1 - <\/code>Primary<\/code> database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>prod20_site2 - Physical standby <\/code>database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>prod20_site4 - Physical standby <\/code>database<\/code><\/div>\n
<\/div>\n
Fast-Start Failover:\u00a0 Disabled<\/code><\/div>\n
<\/div>\n
Configuration Status:<\/code><\/div>\n
SUCCESS\u00a0\u00a0 (status updated 55 seconds ago)<\/code><\/div>\n
<\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And I am going to create a far sync instance fs_site3 to receive changes from the primary database prod20_site20 and to ship these changes to prod20_site4 as shown in this figure<\/p>\n

\"\"<\/a><\/p>\n

With Oracle there is a new CREATE FAR_SYNC command whichh will create the far sync instance for us. But before using this command there are some steps.
\nFirst we have to configure Secure External Password Store for the netalias we use.<\/p>\n

In our case we are using following aliases
\nprod20_site1
\nprod20_site2
\nprod20_site3
\nprod20_site4<\/p>\n

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oracle@oraadserver:\/home\/oracle\/ [prod20 (CDB$ROOT)] tnsping prod20_site1<\/code><\/div>\n
\u2026<\/code><\/div>\n
\u2026<\/code><\/div>\n
Used TNSNAMES adapter <\/code>to<\/code> resolve the alias<\/code><\/div>\n
Attempting <\/code>to<\/code> contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = oraadserver)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = prod20_site1_dgmgrl)))<\/code><\/div>\n
OK (0 msec)<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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oracle@oraadserver:\/home\/oracle\/ [prod20 (CDB$ROOT)] tnsping prod20_site2<\/code><\/div>\n
\u2026<\/code><\/div>\n
\u2026<\/code><\/div>\n
Used TNSNAMES adapter <\/code>to<\/code> resolve the alias<\/code><\/div>\n
Attempting <\/code>to<\/code> contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = oraadserver2)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = prod20_site2_dgmgrl)))<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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oracle@oraadserver:\/home\/oracle\/ [prod20 (CDB$ROOT)] tnsping prod20_site3<\/code><\/div>\n
\u2026<\/code><\/div>\n
\u2026<\/code><\/div>\n
Used TNSNAMES adapter <\/code>to<\/code> resolve the alias<\/code><\/div>\n
Attempting <\/code>to<\/code> contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = oraadserver3)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = fs_site3_dgmgrl)))<\/code><\/div>\n
OK (0 msec)<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n
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\n
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oracle@oraadserver:\/home\/oracle\/ [prod20 (CDB$ROOT)] tnsping prod20_site4<\/code><\/div>\n
\u2026<\/code><\/div>\n
\u2026<\/code><\/div>\n
Used TNSNAMES adapter <\/code>to<\/code> resolve the alias<\/code><\/div>\n
Attempting <\/code>to<\/code> contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = oraadserver4)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = prod20_site4_dgmgrl)))<\/code><\/div>\n
OK (0 msec)<\/code><\/div>\n
oracle@oraadserver:\/home\/oracle\/ [prod20 (CDB$ROOT)]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Basically to configure Secure External Password Store<\/p>\n

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mkstore -wrl wallet_location -<\/code>create<\/code><\/div>\n
mkstore -wrl wallet_location -createCredential prod20_site1 sys <\/code><\/div>\n
mkstore -wrl wallet_location -createCredential prod20_site2 sys <\/code><\/div>\n
mkstore -wrl wallet_location -createCredential prod20_site3\u00a0 sys <\/code><\/div>\n
\u2026<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And after you will have to update your sqlnet.ora file with the location of the wallet.<\/p>\n

If everything is OK, you normally should be able to connect using your tnsalias<\/p>\n

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CDB$ROOT)] sqlplus \/@prod20_site1 <\/code>as<\/code> sysdba<\/code><\/div>\n
<\/div>\n
SQL*Plus: Release 20.0.0.0.0 - Production <\/code>on<\/code> Sat May 30 19:20:21 2020<\/code><\/div>\n
Version 20.2.0.0.0<\/code><\/div>\n
<\/div>\n
Copyright (c) 1982, 2019, Oracle.\u00a0 <\/code>All<\/code> rights reserved.<\/code><\/div>\n
<\/div>\n
Heure de la derniere connexion reussie : Sam. Mai\u00a0\u00a0 30 2020 18:36:15 +02:00<\/code><\/div>\n
<\/div>\n
Connecte a :<\/code><\/div>\n
Oracle <\/code>Database<\/code> 20c Enterprise Edition Release 20.0.0.0.0 - Production<\/code><\/div>\n
Version 20.2.0.0.0<\/code><\/div>\n
<\/div>\n
SQL> show parameter db_unique_name<\/code><\/div>\n
<\/div>\n
NAME<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 TYPE\u00a0\u00a0\u00a0 VALUE<\/code><\/div>\n
------------------------------------ ----------- ------------------------------<\/code><\/div>\n
db_unique_name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 string\u00a0 prod20_site1<\/code><\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

After I have start instance fs_site3 in a no mount mode<\/p>\n

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SQL> startup nomount<\/code><\/div>\n
ORACLE instance started.<\/code><\/div>\n
<\/div>\n
Total System <\/code>Global<\/code> Area\u00a0 314570960 bytes<\/code><\/div>\n
Fixed <\/code>Size<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 9566416 bytes<\/code><\/div>\n
Variable <\/code>Size<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 188743680 bytes<\/code><\/div>\n
Database<\/code> Buffers\u00a0\u00a0\u00a0\u00a0\u00a0 113246208 bytes<\/code><\/div>\n
Redo Buffers\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3014656 bytes<\/code><\/div>\n
SQL> show parameter db_unique_name<\/code><\/div>\n
<\/div>\n
NAME<\/code>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 TYPE\u00a0\u00a0\u00a0 VALUE<\/code><\/div>\n
------------------------------------ ----------- ------------------------------<\/code><\/div>\n
db_unique_name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 string\u00a0 FS_SITE3<\/code><\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And then connection to the broker I can use the command CREATE FAR_SYNC<\/p>\n

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oracle@oraadserver:\/u01\/ [prod20 (CDB$ROOT)] dgmgrl<\/code><\/div>\n
DGMGRL <\/code>for<\/code> Linux: Release 20.0.0.0.0 - Production <\/code>on<\/code> Sat May 30 19:25:31 2020<\/code><\/div>\n
Version 20.2.0.0.0<\/code><\/div>\n
<\/div>\n
Copyright (c) 1982, 2020, Oracle <\/code>and<\/code>\/<\/code>or<\/code> its affiliates.\u00a0 <\/code>All<\/code> rights reserved.<\/code><\/div>\n
<\/div>\n
Welcome <\/code>to<\/code> DGMGRL, type <\/code>\"help\"<\/code> for<\/code> information.<\/code><\/div>\n
DGMGRL> <\/code>connect<\/code> \/<\/code><\/div>\n
Connected <\/code>to<\/code> \"prod20_site1\"<\/code><\/div>\n
Connected <\/code>as<\/code> SYSDG.<\/code><\/div>\n
DGMGRL> <\/code>CREATE<\/code> FAR_SYNC fs_site3 <\/code>AS<\/code> CONNECT<\/code> IDENTIFIER <\/code>IS<\/code> \"prod20_site3\"<\/code>;<\/code><\/div>\n
Creating far sync instance <\/code>\"fs_site3\"<\/code>.<\/code><\/div>\n
Connected <\/code>to<\/code> \"prod20_site1\"<\/code><\/div>\n
Connected <\/code>to<\/code> \"FS_SITE3\"<\/code><\/div>\n
far sync instance <\/code>\"fs_site3\"<\/code> created<\/code><\/div>\n
far sync instance <\/code>\"fs_site3\"<\/code> added<\/code><\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The far sync instance is created and added in the configuration as we can verify<\/p>\n

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DGMGRL> show configuration<\/code><\/div>\n
<\/div>\n
Configuration - prod20<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0<\/code>Protection Mode: MaxAvailability<\/code><\/div>\n
\u00a0\u00a0<\/code>Members:<\/code><\/div>\n
\u00a0\u00a0<\/code>prod20_site1 - <\/code>Primary<\/code> database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>prod20_site2 - Physical standby <\/code>database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>prod20_site4 - Physical standby <\/code>database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fs_site3\u00a0\u00a0\u00a0\u00a0 - Far sync instance (disabled)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>ORA-16905: The member was <\/code>not<\/code> enabled yet.<\/code><\/div>\n
<\/div>\n
Fast-Start Failover:\u00a0 Disabled<\/code><\/div>\n
<\/div>\n
Configuration Status:<\/code><\/div>\n
SUCCESS\u00a0\u00a0 (status updated 31 seconds ago)<\/code><\/div>\n
<\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Let\u2019s enable the far sync instance<\/p>\n

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DGMGRL> enable far_sync fs_site3;<\/code><\/div>\n
Enabled.<\/code><\/div>\n
DGMGRL> show configuration<\/code><\/div>\n
<\/div>\n
Configuration - prod20<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0<\/code>Protection Mode: MaxAvailability<\/code><\/div>\n
\u00a0\u00a0<\/code>Members:<\/code><\/div>\n
\u00a0\u00a0<\/code>prod20_site1 - <\/code>Primary<\/code> database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>prod20_site2 - Physical standby <\/code>database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>prod20_site4 - Physical standby <\/code>database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>fs_site3\u00a0\u00a0\u00a0\u00a0 - Far sync instance<\/code><\/div>\n
<\/div>\n
Fast-Start Failover:\u00a0 Disabled<\/code><\/div>\n
<\/div>\n
Configuration Status:<\/code><\/div>\n
SUCCESS\u00a0\u00a0 (status updated 38 seconds ago)<\/code><\/div>\n
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DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Now that the far sync is created, we can configure the redoroutes for the databases.
\nThe following configuration means
\n-If prod20_site1 is the primary database, it will send the changes to prod20_site2 and to fs_site3
\n-And the fs_site3 will send the changes to prod20_site4 if prod20_site1 is the primary database<\/p>\n

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DGMGRL> edit <\/code>database<\/code> prod20_site1 <\/code>set<\/code> property redoroutes=<\/code>'(local:prod20_site2,fs_site3)'<\/code>;<\/code><\/div>\n
Property <\/code>\"redoroutes\"<\/code> updated<\/code><\/div>\n
<\/div>\n
DGMGRL> edit far_sync fs_site3 <\/code>set<\/code> property redoroutes=<\/code>'(prod20_site1:prod20_site4 ASYNC)'<\/code>;<\/code><\/div>\n
Property <\/code>\"redoroutes\"<\/code> updated<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

We will talk in deep in redoroutes configuration in coming blogs<\/p>\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw A far sync instance is like a standby instance as it can receive redo from the primary database and can ship that redo to other members of the Data Guard configuration. But unlike a physical standby instance, a far sync instance does not contain any datafiles and then can not be open […]<\/p>\n","protected":false},"author":27,"featured_media":14212,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,59],"tags":[1381,221,1971,458],"type_dbi":[],"class_list":["post-14210","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-administration-monitoring","category-oracle","tag-active-data-guard","tag-data-guard","tag-far-sync","tag-oracle-20c"],"acf":[],"yoast_head":"\nOracle 20c : Create a Far Sync Instance Is Now Easy - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/oracle-20c-create-a-far-sync-instance-is-now-easy\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oracle 20c : Create a Far Sync Instance Is Now Easy\" \/>\n<meta property=\"og:description\" content=\"By Mouhamadou Diaw A far sync instance is like a standby instance as it can receive redo from the primary database and can ship that redo to other members of the Data Guard configuration. 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