ORA-01017: invalid username/password; logon denied in 12c R2

If you occurred with above error when you are installing Oracle 12C R2, be careful about needed groups. this error belong to RACDBA group. If you don't add grid user to RACDBA group oracle raise this error hence be sure when you want to create your groups please add oracle and grid in to RACDBA. also I put it oracle help center link.

Refrence

$ id oracle
uid=54321(oracle) gid=54321(oinstall) groups=54321(oinstall),54322(dba), 
54323(oper),54324(backupdba),54325(dgdba),54326(kmdba),54327(asmdba),54330(racdba)

$ id grid
uid=54331(grid) gid=54321(oinstall) groups=54321(oinstall),54322(dba),
54327(asmdba),54328(asmoper),54329(asmadmin),54330(racdba)

Check tablespace usage

One of the most problem when monitoring team or dba wants to check tablespace usage is real space.

In fact in the most query the query shows free space base on amount of extended space and somebody has problem because you have to calculate that how much space is remaining on your tablespace of whole. I changed a script for getting to this purpose and also it supports bigfile. you can  use it below query o check your real free space of your tablespaces.

--if bigfile=no the each datafile=32 GB

--if bigfile=YES the each datafile=32768 GB

--and also  db_block_size=8192

SELECT *

  FROM (SELECT SUBSTR(c.contents, 1, 1) C,

               a.tablespace_name,

               a.alloc_gb,

               a.alloc_gb - nvl(b.free_gb, 0) used_gb,

               nvl(b.free_gb, 0) free_gb,

               

               a.file_count,

               CASE

                 WHEN (a.max_gb - a.alloc_gb) <= 0 THEN

                  ROUND((a.alloc_gb - nvl(b.free_gb, 0)) / a.alloc_gb * 100)

                 ELSE

                  ROUND((a.alloc_gb - nvl(b.free_gb, 0)) / a.max_gb * 100)

               END pct_used,

               

               case

                 when (c.bigfile = 'NO') then

                  (32 * a.file_count) - (a.alloc_gb - nvl(b.free_gb, 0))

                 when (c.bigfile = 'YES') then

                  (32768 * a.file_count) - (a.alloc_gb - nvl(b.free_gb, 0))

               end real_free_SIZE_GB

        

          FROM (SELECT tablespace_name,

                       COUNT(*) file_count,

                       ROUND(SUM(bytes) / 1024 / 1024 / 1024) alloc_gb,

                       ROUND(SUM(DECODE(maxbytes, 0, bytes, maxbytes) / 1024 / 1024 / 1024)) max_gb

                  FROM dba_data_files

                 GROUP BY tablespace_name) a,

               (SELECT tablespace_name,

                       ROUND(SUM(bytes) / 1024 / 1024 / 1024) free_gb

                  FROM dba_free_space

                 GROUP BY tablespace_name) b,

               dba_tablespaces c

         WHERE a.tablespace_name = b.tablespace_name(+)

           AND a.tablespace_name = c.tablespace_name

        

        UNION

        

        SELECT SUBSTR(c.contents, 1, 1) C,

               a.tablespace_name,

               a.alloc_gb,

               NVL(b.used_gb, 0) used_gb,

               a.alloc_gb - NVL(b.used_gb, 0) free_gb,

               

               a.file_count,

               CASE

                 WHEN (a.max_gb - a.alloc_gb) <= 0 THEN

                  ROUND(NVL(b.used_gb, 0) / a.alloc_gb * 100)

                 ELSE

                  ROUND(NVL(b.used_gb, 0) / a.max_gb * 100)

               END

               

               pct_used,

               

               case

                 when (c.bigfile = 'NO') then

                  (32 * a.file_count) - (used_gb)

                 when (c.bigfile = 'YES') then

                  (32768 * a.file_count) - (used_gb)

               end real_free_SIZE_GB

        

          FROM (SELECT tablespace_name,

                       COUNT(*) file_count,

                       ROUND(SUM(bytes) / 1024 / 1024 / 1024) alloc_gb,

                       ROUND(SUM(DECODE(maxbytes, 0, bytes, maxbytes) / 1024 / 1024 / 1024)) max_gb

                  FROM dba_temp_files

                 GROUP BY tablespace_name) a,

               (SELECT tablespace tablespace_name,

                       ROUND(SUM(blocks * b.VALUE) / 1024 / 1024 / 1024, 2) used_gb

                  FROM v$tempseg_usage a, v$parameter b

                 WHERE b.name = 'db_block_size'

                 GROUP BY tablespace) b,

               dba_tablespaces c

         WHERE a.tablespace_name = b.tablespace_name(+)

           AND a.tablespace_name = c.tablespace_name)

 ORDER BY 7 DESC NULLS LAST, 2

Drop datafiles from a tablespace

This is an important question that I have heard a lot these days. The question is how we can remove a data file from a tablespace in oracle and what is the solution for doing this issue  and It is possible or not.I should say please concentrate on this subject that when you add a datafile in a specific tablespace Oracle distribute the extends on all datafiles for improving I/O, therefore be careful If you remove a datafile you will lost your data.What is the solution If we want to drop some datafiles from a tablespace?

Create a new tablespace in your database and move all of your segments on it for example Table, Index, MVW, Partititon and Subpartitions.

--Move Table

ALTER TABLE <TABLE NAME to be moved> MOVE TABLESPACE <destination TABLESPACE NAME>;

--Move Index

select 'alter index '||owner||'.'||index_name||' rebuild tablespace TO_TABLESPACE_NAME;' from all_indexes where owner='OWNERNAME';

--Move Partition Index

ALTER INDEX <index_name> REBUILD PARTITION <partition_name> TABLESPACE <new_tablespace> NOLOGGING;

--Move Partition

alter table owner.your_table move partition p1 tablespace TBS4 update global indexes;

in 12c:

alter table owner.your_table move partition p1 tablespace TBS4 online;

--Move LOBs:

SELECT 'ALTER TABLE <schema_name>.'||LOWER(TABLE_NAME)||' MOVE LOB('||LOWER(COLUMN_NAME)||') STORE AS (TABLESPACE <table_space>);'

FROM DBA_TAB_COLS

WHERE OWNER = '<schema_name>' AND DATA_TYPE like '%LOB%';

ALTER TABLE SCOT.bin$6t926o3phqjgqkjabaetqg==$0 MOVE LOB(calendar) STORE AS (TABLESPACE USERS);

After that you move all your segments you can drop old tablespace and rename new tablespace with old tablespace name.

Data Redaction in Oracle Database 12c

I want to explain about a new feature in oracle 12c that I’ve studied recently. It’s one of the best features that I’ve seen recently in oracle security.

Data Redaction in Oracle Database 12c

Data Redaction is a new advance feature in oracle 12c that enables the protection of data shown to the user in real time, without requiring changes to the application. In before version also we have some features about it like VDP but above feature are very structured. You can read and implement daa Redaction completely in oracle web site with below link.

http://www.oracle.com/technetwork/articles/database/data-redaction-odb12c-2331480.html

Thanks in Advance

Multiprocess and Multithreaded Oracle Database

Multithreaded Configuration

A process is a mechanism in an operating system that can run a series of steps. The process execution architecture depends on the operating system. For example, on Windows an Oracle background process is a thread of execution within a process. On Linux and UNIX, an Oracle process is either an operating system process or a thread within an operating system process.

Types of Processes

A database instance contains or interacts with the following types of processes:

·         A client process runs the application or Oracle tool code.

·         An Oracle process is a unit of execution that runs the Oracle database code. In the multithreaded architecture, an Oracle process can be an operating system process or a thread within an operating system process. Oracle processes include the following subtypes:

·         A background process starts with the database instance and perform maintenance tasks such as performing instance recovery, cleaning up processes, writing redo buffers to disk, and so on.

·         A server process performs work based on a client request.

Oracle database running on Linux uses the same architecture and every process like LGWR, DBWR, SMON has it’s own OS processes. The resources consumed are visible in OS level process monitoring tools.Oracle 12c database has the same architecture. The below command was run on fresh install of 12c database.

ps -ef | grep [o]ra_

oracle 2191 1 0 06:07 ? 00:00:00 ora_pmon_cdb12c
oracle 2193 1 0 06:07 ? 00:00:00 ora_psp0_cdb12c
oracle 2195 1 31 06:07 ? 00:00:20 ora_vktm_cdb12c
oracle 2199 1 0 06:07 ? 00:00:00 ora_gen0_cdb12c
oracle 2201 1 0 06:07 ? 00:00:00 ora_mman_cdb12c
oracle 2205 1 0 06:07 ? 00:00:00 ora_diag_cdb12c
oracle 2207 1 0 06:07 ? 00:00:00 ora_dbrm_cdb12c
oracle 2209 1 0 06:07 ? 00:00:00 ora_dia0_cdb12c
oracle 2211 1 0 06:07 ? 00:00:00 ora_dbw0_cdb12c
oracle 2213 1 0 06:07 ? 00:00:00 ora_lgwr_cdb12c
oracle 2215 1 0 06:07 ? 00:00:00 ora_ckpt_cdb12c
oracle 2217 1 0 06:07 ? 00:00:00 ora_smon_cdb12c
oracle 2219 1 0 06:07 ? 00:00:00 ora_reco_cdb12c
oracle 2221 1 0 06:07 ? 00:00:00 ora_lreg_cdb12c
oracle 2223 1 5 06:07 ? 00:00:03 ora_mmon_cdb12c
oracle 2225 1 0 06:07 ? 00:00:00 ora_mmnl_cdb12c
oracle 2227 1 0 06:07 ? 00:00:00 ora_d000_cdb12c
oracle 2229 1 0 06:07 ? 00:00:00 ora_s000_cdb12c
oracle 2241 1 0 06:07 ? 00:00:00 ora_tmon_cdb12c
oracle 2243 1 0 06:07 ? 00:00:00 ora_tt00_cdb12c
oracle 2245 1 0 06:07 ? 00:00:00 ora_smco_cdb12c
oracle 2247 1 0 06:07 ? 00:00:00 ora_aqpc_cdb12c
oracle 2266 1 0 06:07 ? 00:00:00 ora_w000_cdb12c
oracle 2270 1 6 06:07 ? 00:00:03 ora_p000_cdb12c
oracle 2272 1 6 06:07 ? 00:00:03 ora_p001_cdb12c
oracle 2274 1 0 06:07 ? 00:00:00 ora_p002_cdb12c
oracle 2276 1 0 06:07 ? 00:00:00 ora_p003_cdb12c
oracle 2279 1 0 06:07 ? 00:00:00 ora_qm02_cdb12c
oracle 2283 1 0 06:07 ? 00:00:00 ora_q002_cdb12c
oracle 2285 1 0 06:07 ? 00:00:00 ora_q003_cdb12c
oracle 2309 1 0 06:07 ? 00:00:00 ora_p004_cdb12c
oracle 2311 1 1 06:07 ? 00:00:00 ora_p005_cdb12c
oracle 2329 1 5 06:08 ? 00:00:01 ora_cjq0_cdb12c
oracle 2333 1 2 06:08 ? 00:00:00 ora_p006_cdb12c
oracle 2335 1 2 06:08 ? 00:00:00 ora_p007_cdb12c
oracle 2338 1 0 06:08 ? 00:00:00 ora_vkrm_cdb12c
oracle 2346 1 0 06:08 ? 00:00:00 ora_p008_cdb12c
oracle 2348 1 0 06:08 ? 00:00:00 ora_p009_cdb12c
oracle 2350 1 0 06:08 ? 00:00:00 ora_p00a_cdb12c
oracle 2352 1 0 06:08 ? 00:00:00 ora_p00b_cdb12c
oracle 2354 1 2 06:08 ? 00:00:00 ora_j000_cdb12c
oracle 2356 1 4 06:08 ? 00:00:00 ora_j001_cdb12c
oracle 2358 1 1 06:08 ? 00:00:00 ora_j002_cdb12c
oracle 2360 1 2 06:08 ? 00:00:00 ora_j003_cdb12c
oracle 2362 1 3 06:08 ? 00:00:00 ora_j004_cdb12c
oracle 2364 1 2 06:08 ? 00:00:00 ora_j005_cdb12c
oracle 2366 1 2 06:08 ? 00:00:00 ora_j006_cdb12c
oracle 2368 1 3 06:08 ? 00:00:00 ora_j007_cdb12c
oracle 2370 1 1 06:08 ? 00:00:00 ora_j008_cdb12c
oracle 2372 1 2 06:08 ? 00:00:00 ora_j009_cdb12c
oracle 2374 1 1 06:08 ? 00:00:00 ora_j010_cdb12c
oracle 2376 1 1 06:08 ? 00:00:00 ora_j011_cdb12c
oracle 2378 1 2 06:08 ? 00:00:00 ora_j012_cdb12c
oracle 2380 1 2 06:08 ? 00:00:00 ora_j013_cdb12c
oracle 2382 1 1 06:08 ? 00:00:00 ora_j014_cdb12c
oracle 2384 1 3 06:08 ? 00:00:00 ora_j015_cdb12c
oracle 2386 1 1 06:08 ? 00:00:00 ora_j016_cdb12c
oracle 2388 1 1 06:08 ? 00:00:00 ora_j017_cdb12c
oracle 2390 1 2 06:08 ? 00:00:00 ora_j018_cdb12c
oracle 2392 1 1 06:08 ? 00:00:00 ora_j019_cdb12c
oracle 2394 1 1 06:08 ? 00:00:00 ora_j020_cdb12c
oracle 2396 1 0 06:08 ? 00:00:00 ora_j021_cdb12c
oracle 2398 1 5 06:08 ? 00:00:00 ora_m000_cdb12c

$ ps -ef | grep [o]ra_|wc
40 320 2560

Multithreaded Configuration

Starting in Oracle 12c database, you can change this and enable the new Multithreaded configuration. You can change the architecture by making Oracle database use thread based architecture instead of process based. Once changed, all Oracle processes will be threads within a few Oracle processes. Thus if CPU moves from one Oracle process to the other, the time between the context switch will be reduced significantly as the switching from one thread to the other is within the same process. During testing, this has resulted in up to 30% performance improvements. You can use the following command in SQL*PLUS to view the current value of THREADED_EXECUTION parameter.

The choice of threading model is dictated by the THREADED_EXECUTION initialization parameter.

THREADED_EXECUTION=FALSE : The default value causes Oracle to run using the multiprocess model.

THREADED_EXECUTION=TRUE : Oracle runs with the multithreaded model.

To switch to the multithreaded model, simply set the THREADED_EXECUTION parameter and restart the database.

CONN sys AS SYSDBA

ALTER SYSTEM SET threaded_execution=TRUE SCOPE=SPFILE;

SHUTDOWN IMMEDIATE;

STARTUP;

If you encounter “ORA-01017: invalid username/password; logon denied” while restarting database then please refer to the end of this article under OS Authentication.

SQL> SHOW PARAMETER thread;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
parallel_threads_per_cpu integer 2
thread integer 0
threaded_execution boolean TRUE

Also for all incoming requests to make use of this architecture you need to set the below mentioned parameter in Listener.ora file.

DEDICATED_THROUGH_BROKER_<listener-name>=ON

You need to provide your own Listener name at the end.

Now we will run the OS command again to check how many processes are created.

$ ps -ef | grep [o]ra_
oracle 2544 1 0 06:25 ? 00:00:00 ora_pmon_cdb12c
oracle 2546 1 0 06:25 ? 00:00:00 ora_psp0_cdb12c
oracle 2548 1 25 06:25 ? 00:01:47 ora_vktm_cdb12c
oracle 2552 1 0 06:25 ? 00:00:01 ora_u004_cdb12c
oracle 2558 1 9 06:25 ? 00:00:41 ora_u005_cdb12c
oracle 2564 1 0 06:25 ? 00:00:00 ora_dbw0_cdb12c

$ ps -ef | grep [o]ra_|wc
6 48 384

The number of processes have been reduced from 40 to 6. That is a huge plus and that’s because there isn’t a separate process for every Oracle process. Most of the Oracle processes are now threads within these 6 processes.

OS Authentication

When you enable Multithreaded configuration then you are not allowed to log into Oracle using OS level authentication. The following error will occur if you try to.

$ sqlplus / as sysdba
SQL*Plus: Release 12.1.0.1.0 Production on Sat Jul 6 06:40:39 2013
Copyright (c) 1982, 2013, Oracle. All rights reserved.
ERROR:
ORA-01017: invalid username/password; logon denied

Use the following method to log in as SYS.

Enter user-name: sys as sysdba
Enter password:
Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options.

How to Chang VIP Address in Oracle RAC 11g

Today, I have a request from network administrator for changing vip address in oracle RAC database because of he needs that ip that it set on node1. You can follow below scripts for changing VIP IP address.

On node1:

[root@test-1 bin]# ./srvctl stop vip -n test-1 –f

[root@test-1 bin]# ./srvctl config vip -n test-1

VIP exists: /test-1-vip/10.8.72.27/10.8.72.0/255.255.255.0/eth0, hosting node test-1

·         Be careful, you should add new IP address to your host to each node.

·         We want to change 10.8.72.27 to 10.8.72.32.

[root@test-1 bin]# cd /grid/product/11.2.0/grid_1/bin/

[root@test-1 bin]# ./srvctl  modify nodeapps -n test-1 -A 10.8.72.32/255.255.255.0/eth0

·         Check your new IP:

[root@test-1 bin]# /sbin/ifconfig -a | egrep '(eth0|Mask)'

Setting up GG Replication

In the following post we’ll understand to set up a replication using GoldenGate, for instruction on installing the software take a look on my small post on the same

Now we assume that the GG is installed and we have two servers on which Oracle databases are running, the GG Manager process is up and running on both these servers as GG is installed on both these servers, the TCP/IP network connectivity open from source server to target server’s manager port and basic understanding of GG replication flow which can be quickly revised from my post


Basic Replication Steps

Preparing the Source Database

STEP 1:- The Source database should be in archivelog mode, if not, follow the below steps:-

SQL> shutdown immediate

SQL> startup mount

SQL> alter database archivelog;

SQL> alter database open;

SQL> select log_mode from v$database;

LOG_MODE

————

ARCHIVELOG

STEP 2:- Enable minimal supplemental logging:

SQL> alter database add supplemental log data;

Database altered.

STEP 3:- Turn off the database recyclebin feature and purge it.

SQL> PURGE DBA_RECYCLEBIN;
SQL> alter system set recyclebin=off scope=spfile;

DBA Recyclebin purged.

STEP 4:- Create GoldenGate Schema (tablespace/user) and grant necessary priveleges:-

SQL>  create tablespace gg_tbs datafile ‘/u01/app/oracle/oradata/orcl/gg_tbs_data01.dbf’ size 100m;

Tablespace created.

SQL>  create user ggate identified by oracle default tablespace gg_tbs quota unlimited on gg_tbs;

User created.

SQL>  grant CREATE SESSION, CONNECT, RESOURCE, ALTER ANY TABLE, ALTER SYSTEM, CREATE TABLE, DBA, LOCK ANY TABLE, SELECT ANY TRANSACTION, FLASHBACK ANY TABLE to ggate;

Grant succeeded.

SQL>  grant execute on utl_file to ggate;

Grant succeeded.

STEP 5:- Now go to the GoldenGate home directory and run scripts for creating all necessary objects for replication.

$ cd /u01/app/oracle/product/gg/

$ sqlplus / as sysdba

SQL> @marker_setup.sql
SQL> @ddl_setup.sql
SQL> @role_setup.sql
SQL> grant GGS_GGSUSER_ROLE to ggate;

SQL> @ddl_enable.sql
STEP 6:- Now edit the parameter file:-

$./ggsci

GGSCI  1> EDIT PARAMS ./GLOBALS

GGSCHEMA ggate

STEP 7:- Now lets create the schema for replication on both source and target database.

SQL> create user source identified by source default tablespace users temporary tablespace temp;

User created.

SQL> grant connect,resource,unlimited tablespace to source;

Grant succeeded.

SQL>

SQL> create user target identified by target default tablespace users temporary tablespace temp;

User created.

SQL> grant connect,resource,unlimited tablespace to target;

Grant succeeded.

STEP 8:- Now Creating the directories for trail files on both servers and create directory for discard file on target server only.

Source server

mkdir /u01/app/oracle/product/gg/dirdat/tr

Target Server

mkdir /u01/app/oracle/product/gg/dirdat/tr

mkdir /u01/app/oracle/product/gg/discard

STEP 9:- Now, Configuring extract process on Source Database:-

$ ./ggsci

GGSCI  1> edit params mgr

PORT 7809

GGSCI  2> start manager

Manager started.

GGSCI (db.us.oracle.com) 3> info all

Program     Status      Group       Lag at Chkpt  Time Since Chkpt

MANAGER     RUNNING

STEP 10:- Login into database and add additional information about primary keys into log files.

GGSCI 4> dblogin userid ggate
Password:
Successfully logged into database.

GGSCI 5> ADD SCHEMATRANDATA source

2015-08-03 10:30:20 INFO OGG-01788 SCHEMATRANDATA has been added on schema source.

GGSCI 6> add extract ext1, tranlog, begin now
EXTRACT added.

GGSCI 7> add exttrail /u01/app/oracle/product/gg/dirdat/tr, extract ext1
EXTTRAIL added.

GGSCI 8> edit params ext1
extract ext1
userid ggate, password oracle
exttrail /u01/app/oracle/product/gg/dirdat/tr
ddl include mapped objname source.*;
table source.*;

GGSCI 9> info all

Program Status Group Lag at Chkpt Time Since Chkpt

MANAGER RUNNING
EXTRACT STOPPED EXT1 00:00:00 00:01:29

GGSCI 10> add extract pump1, exttrailsource /u01/app/oracle/product/gg/dirdat/tr , begin now
EXTRACT added.

GGSCI 11> add rmttrail /u01/app/oracle/product/gg/dirdat/tr, extract pump1
RMTTRAIL added.

GGSCI 12> edit params pump1
EXTRACT pump1
USERID ggate, PASSWORD oracle
RMTHOST db2, MGRPORT 7809
RMTTRAIL /u01/app/oracle/product/gg/dirdat/tr
PASSTHRU
table source.*;

GGSCI 13> info all

Program Status Group Lag at Chkpt Time Since Chkpt

MANAGER RUNNING
EXTRACT STOPPED EXT1 00:00:00 00:02:33
EXTRACT STOPPED PUMP1 00:00:00 00:02:56

Preparing the Target Database

STEP 1:- Verify if the manager is running on the Target Server and Start if not already started.

$ ./ggsci

GGSCI 1> edit params mgr
PORT 7809

GGSCI 2> start manager

Manager started.

GGSCI 3> info all

Program Status Group Lag at Chkpt Time Since Chkpt

MANAGER RUNNING

STEP 3:- Create a checkpoint table and change the GLOBAL file.

GGSCI  4> EDIT PARAMS ./GLOBALS
CHECKPOINTTABLE     target.checkpoint

GGSCI  5> dblogin userid target
Password:
Successfully logged into database.

GGSCI  6> add checkpointtable target.checkpoint

Successfully created checkpoint table target.checkpoint.

STEP 4:- Add replicat process

GGSCI  8> add replicat rep1, exttrail /u01/app/oracle/product/gg/dirdat/tr, begin now
REPLICAT added.

GGSCI (db2) 9> edit params rep1
REPLICAT rep1
ASSUMETARGETDEFS
USERID target, PASSWORD oracle
discardfile /u01/app/oracle/product/gg/discard/rep1_discard.txt, append, megabytes 10 DDL
map source.*, target target.*;

GGSCI  10> info all

Program Status Group Lag at Chkpt Time Since Chkpt

MANAGER RUNNING
REPLICAT STOPPED REP1 00:00:00 00:01:32

GGSCI  11>

Starting Replication

At Source Server

STEP 1:- Start extract process

GGSCI  6> start extract ext1

Sending START request to MANAGER …
EXTRACT EXT1 starting

GGSCI  7> start extract pump1

Sending START request to MANAGER …
EXTRACT PUMP1 starting

GGSCI  8> info all

Program Status Group Lag at Chkpt Time Since Chkpt

MANAGER RUNNING
EXTRACT RUNNING EXT1 00:00:00 00:00:01
EXTRACT RUNNING PUMP1 00:00:00 00:01:01

At Destination Server

STEP 2:- Start Replicat Process

GGSCI  6> start replicat rep1

Sending START request to MANAGER …
REPLICAT REP1 starting

GGSCI (db2) 7> info all

Program Status Group Lag at Chkpt Time Since Chkpt

MANAGER RUNNING
REPLICAT RUNNING REP1 00:00:00 00:00:06

Finally our replication has been configured between source and destination DB, so now you can create objects under Source schema and it would get replicated to Target Schema. There are several features of GoldenGate which makes it far better than Oracle Streams and CDC.

Refrence