Installing and setting up Oracle GoldenGate connecting to an Oracle database
Also please make sure the Oracle database is in archive log mode
[oracle@ggos ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.4.0 Production on Wed Sep 4 21:00:12 2013 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> alter system set log_archive_dest_1='LOCATION=/u01/app/oracle/oradata/arch'; System altered. SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started. Total System Global Area 835104768 bytes
Fixed Size 2257840 bytes
Variable Size 717229136 bytes
Database Buffers 113246208 bytes
Redo Buffers 2371584 bytes
Database mounted.
SQL> alter database archivelog; Database altered. SQL> alter database open; Database altered. SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/app/oracle/oradata/arch
Oldest online log sequence 3
Next log sequence to archive 5
Current log sequence 5
SQL>
In addition you should enable minimum supplemental logging
SQL> alter database add supplemental log data; Database altered.
SQL> alter database force logging; Database altered.
SQL> SELECT force_logging, supplemental_log_data_min FROM v$database; FOR SUPPLEME
--- --------
YES YES
Add the GoldenGate directory to your LD_LIBRARY_PATH and PATH
export PATH=.:${JAVA_HOME}/bin:${PATH}:$HOME/bin:$ORACLE_HOME/bin:$ORACLE_HOME/OPatch:/u01/app/oracle/ggs
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/u01/app/oracle/ggs/lib
The first step is to open the GoldenGate command line interface and to create the necessary subdirectories
[oracle@ggos ggs]$ ./ggsci Oracle GoldenGate Command Interpreter for Oracle
Version 11.2.1.0.7 16934304 OGGCORE_11.2.1.0.7_PLATFORMS_130709.1600.1_FBO
Linux, x64, 64bit (optimized), Oracle 11g on Jul 18 2013 07:04:28 Copyright (C) 1995, 2013, Oracle and/or its affiliates. All rights reserved. GGSCI (ggos) 1> create subdirs Creating subdirectories under current directory /u01/app/oracle/ggs Parameter files /u01/app/oracle/ggs/dirprm: already exists
Report files /u01/app/oracle/ggs/dirrpt: created
Checkpoint files /u01/app/oracle/ggs/dirchk: created
Process status files /u01/app/oracle/ggs/dirpcs: created
SQL script files /u01/app/oracle/ggs/dirsql: created
Database definitions files /u01/app/oracle/ggs/dirdef: created
Extract data files /u01/app/oracle/ggs/dirdat: created
Temporary files /u01/app/oracle/ggs/dirtmp: created
Stdout files /u01/app/oracle/ggs/dirout: created GGSCI (ggos) 2>
The second step is to create a parameter file for the manager which at least contains a PORT number for the manager
GGSCI (ggos) 3> edit param mgr
add the following content to the parameter file
GGSCI (ggos) 2> view param mgr PORT 7809
Save the parameter file, exit from the editor, start the manager and verify if it is running
GGSCI (ggos) 1> start mgr Manager started. GGSCI (ggos) 2> info all Program Status Group Lag at Chkpt Time Since Chkpt MANAGER RUNNING GGSCI (ggos) 3> info mgr Manager is running (IP port ggos.7809).
Installing and setting up Oracle GoldenGate on the PostgreSQL machine
Then add the lib directory to the LD_LIBRARY_PATH and PATH
export LD_LIBRARY_PATH=/data/pgsql/lib:/data/pgsql/ggs/lib
export PATH=/data/pgsql/bin:/data/pgsql/ggs:$PATH
GoldenGate uses an ODBC connection to connect to the Postgres database. The ODBC driver is shipped with the installation and on Unix you have to create the ODBC configuration file which is commonly called odbc.ini on your own
Here the file I used
[postgres@ggpgt ggs]$ pwd
/data/pgsql/ggs
[postgres@ggpgt ggs]$ cat odbc.ini
[ODBC Data Sources]
GG_Postgres=DataDirect 6.1 PostgreSQL Wire Protocol
[ODBC]
IANAAppCodePage=106
InstallDir=/data/pgsql/ggs
[GG_Postgres]
Driver=/data/pgsql/ggs/lib/GGpsql25.so
Description=DataDirect 6.1 PostgreSQL Wire Protocol
Database=repdb
HostName=ggpgt
PortNumber=1521
LogonID=zwc
Password=zwc
Finally we need to export an ODBC environment variable which is called ODBCINI and points to the odbc.ini file we just created
export ODBCINI=/data/pgsql/ggs/odbc.ini
We've prepared the ODBC set up, now let's start with the GoldenGate set up. Similar to the installation on the Oracle database host we first create the GoldenGate subdirectories
[postgres@ggpgt ggs]$ ./ggsci Oracle GoldenGate Command Interpreter
Version 11.2.1.0.2 OGGCORE_11.2.1.0.2T3_PLATFORMS_120724.2205
Linux, x64, 64bit (optimized), PostgreSQL on Jul 25 2012 00:32:24 Copyright (C) 1995, 2012, Oracle and/or its affiliates. All rights reserved. GGSCI (ggpgt) 1> create subdirs Creating subdirectories under current directory /data/pgsql/ggs Parameter files /data/pgsql/ggs/dirprm: already exists
Report files /data/pgsql/ggs/dirrpt: created
Checkpoint files /data/pgsql/ggs/dirchk: created
Process status files /data/pgsql/ggs/dirpcs: created
SQL script files /data/pgsql/ggs/dirsql: created
Database definitions files /data/pgsql/ggs/dirdef: created
Extract data files /data/pgsql/ggs/dirdat: created
Temporary files /data/pgsql/ggs/dirtmp: created
Stdout files /data/pgsql/ggs/dirout: created
create the Manager parameter file and start the manager
GGSCI (ggpgt) 3> view param mgr PORT 7809
Once we created the parameter file we can start the manager and check its status
GGSCI (ggpgt) 9> start mgr Manager started. GGSCI (ggpgt) 10> info all Program Status Group Lag at Chkpt Time Since Chkpt MANAGER RUNNING GGSCI (ggpgt) 11> info mgr Manager is running (IP port ggpgt.7809).
Demo table in Oracle and PostgreSQL
As mentioned, it is a basic set up without using initial load nor a data pump process. So we only create a simple table in Oracle and Postgres to replicate data. My Oracle database has a user called postgres and this user will now own a table ggtest
[oracle@ggos ~]$ sqlplus zwc SQL*Plus: Release 11.2.0.4.0 Production on Wed Sep 4 21:40:03 2013 Copyright (c) 1982, 2013, Oracle. All rights reserved. Enter password: Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> create table ggtest(col1 number,col2 varchar2(50)); Table created. SQL> alter table ggtest add primary key(col1); Table altered.
Then you can connect with a Postgres utility to the Postgres database and create a similar table in the public schema
[postgres@ggpgt ~]$ psql -U zwc -d repdb -h ggpgt
Password for user zwc:
psql (9.2.4)
Type "help" for help. repdb=> create table "public"."ggtest"
repdb-> (
repdb(> "col1" integer NOT NULL,
repdb(> "col2" varchar(20),
repdb(> CONSTRAINT "PK_Col111" PRIMARY KEY ("col1")
repdb(> );
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "PK_Col111" for table "ggtest"
CREATE TABLE
repdb-> \d+ ggtest
Table "public.ggtest"
Column | Type | Modifiers | Storage | Stats target | Description
--------+-----------------------+-----------+----------+--------------+-------------
col1 | integer | not null | plain | |
col2 | character varying(20) | | extended | |
Indexes:
"PK_Col111" PRIMARY KEY, btree (col1)
Has OIDs: no
Verify Oracle DB connection
To check the connection to the Oracle database we can use the GoldenGate command interface, log into the Oracle db, list the tables we can capture and check their data types
[oracle@ggos ggs]$ ./ggsci Oracle GoldenGate Command Interpreter for Oracle
Version 11.2.1.0.7 16934304 OGGCORE_11.2.1.0.7_PLATFORMS_130709.1600.1_FBO
Linux, x64, 64bit (optimized), Oracle 11g on Jul 18 2013 07:04:28 Copyright (C) 1995, 2013, Oracle and/or its affiliates. All rights reserved. GGSCI (ggos) 1> dblogin userid zwc, password zwc
Successfully logged into database. GGSCI (ggos) 2> list tables *
ZWC.GGTEST Found 1 tables matching list criteria. GGSCI (ggos) 3> capture tabledef zwc.ggtest
Table definitions for ZWC.GGTEST:
COL1 NUMBER NOT NULL PK
COL2 VARCHAR (50)
Verify PostgreSQL ODBC connection
To check the ODBC connection to the Postgres database we also use the GoldenGate command line tool
[postgres@ggpgt ggs]$ ./ggsci Oracle GoldenGate Command Interpreter
Version 11.2.1.0.2 OGGCORE_11.2.1.0.2T3_PLATFORMS_120724.2205
Linux, x64, 64bit (optimized), PostgreSQL on Jul 25 2012 00:32:24 Copyright (C) 1995, 2012, Oracle and/or its affiliates. All rights reserved. GGSCI (ggpgt) 1> dblogin sourcedb gg_postgres userid zwc
Password: 2013-09-04 13:56:35 INFO OGG-03036 Database character set identified as UTF-8. Locale: en_US. 2013-09-04 13:56:35 INFO OGG-03037 Session character set identified as UTF-8.
Successfully logged into database. GGSCI (ggpgt) 2> list tables *
public.ggtest
public.t Found 2 tables matching list criteria. GGSCI (ggpgt) 3> capture tabledef "public"."ggtest"
Table definitions for public.ggtest:
col1 NUMBER (10) NOT NULL PK
col2 VARCHAR (20)
GoldenGate extract process
In the following section we create an extract process that captures the changes for the GGTEST table in the Oracle database and copies the changes directly to the Postgres machine
Every process needs it config file, so let's create it for the extract process
GGSCI (ggos) 1> edit param epos
with these parameters
GGSCI (ggos) 3> view param epos EXTRACT epos
SETENV (NLS_LANG="AMERICAN_AMERICA.ZHS16GBK")
SETENV (ORACLE_HOME="/u01/app/oracle/product/11.2.0/dbhome_1")
SETENV (ORACLE_SID="oraprod")
USERID zwc, PASSWORD zwc
RMTHOST ggpgt, MGRPORT 7809
RMTTRAIL /data/pgsql/ggs/dirdat/ep
TABLE zwc.ggtest;
My extract process is called epos and it connects as user ZWC using the password zwc to the Oracle database. It will extract changes on the Oracle table ggtest stored in the postgres schema and will put the information into a trail file on my Postgres machine.
Once we created the parameter file we can add the extract process and start it
GGSCI (ggos) 4> add extract epos, tranlog, begin now
EXTRACT added. GGSCI (ggos) 5> add exttrail /data/pgsql/ggs/dirdat/ep, extract epos, megabytes 5
EXTTRAIL added. GGSCI (ggos) 6> start epos Sending START request to MANAGER ...
EXTRACT EPOS starting GGSCI (ggos) 7> info all Program Status Group Lag at Chkpt Time Since Chkpt MANAGER RUNNING
EXTRACT RUNNING EPOS 00:00:00 00:00:00
GGSCI (ggos) 12> info extract epos EXTRACT EPOS Last Started 2013-09-04 22:07 Status RUNNING
Checkpoint Lag 00:00:00 (updated 00:00:00 ago)
Log Read Checkpoint Oracle Redo Logs
2013-09-04 22:07:58 Seqno 7, RBA 18612736
SCN 0.1040942 (1040942)
Create DEFINITIONS File
We're replicating data in a heterogeneous environment, so we need to give the process loading the data into the Postgres database more details about the data in the extract file. This is done by creating a definitions file using defgen. As usual we have to create a parameter file
GGSCI (ggos) 17> view param defgen DEFSFILE /u01/app/oracle/ggs/dirdef/GGTEST.def
USERID zwc, password zwc
TABLE ZWC.GGTEST;
Now exit from ggsci and call defgen on the command line and add the reference to the defgen parameter file just created
[oracle@ggos ggs]$ ./defgen paramfile ./dirprm/defgen.prm ***********************************************************************
Oracle GoldenGate Table Definition Generator for Oracle
Version 11.2.1.0.7 16934304 OGGCORE_11.2.1.0.7_PLATFORMS_130709.1600.1
Linux, x64, 64bit (optimized), Oracle 11g on Jul 18 2013 04:10:02
Copyright (C) 1995, 2013, Oracle and/or its affiliates. All rights reserved. Starting at 2013-09-04 22:24:21
*********************************************************************** Operating System Version:
Linux
Version #1 SMP Wed Feb 22 17:37:40 EST 2012, Release 2.6.32-300.10.1.el5uek
Node: ggos
Machine: x86_64
soft limit hard limit
Address Space Size : unlimited unlimited
Heap Size : unlimited unlimited
File Size : unlimited unlimited
CPU Time : unlimited unlimited Process id: 29365 ***********************************************************************
** Running with the following parameters **
***********************************************************************
DEFSFILE /u01/app/oracle/ggs/dirdef/GGTEST.def
USERID zwc, password ***
TABLE ZWC.GGTEST;
Retrieving definition for ZWC.GGTEST Definitions generated for 1 table in /u01/app/oracle/ggs/dirdef/GGTEST.def
[oracle@ggos ggs]$ cat dirdef/GGTEST.def
*+- Defgen version 2.0, Encoding UTF-8
*
* Definitions created/modified 2013-09-04 22:24
*
* Field descriptions for each column entry:
*
* 1 Name
* 2 Data Type
* 3 External Length
* 4 Fetch Offset
* 5 Scale
* 6 Level
* 7 Null
* 8 Bump if Odd
* 9 Internal Length
* 10 Binary Length
* 11 Table Length
* 12 Most Significant DT
* 13 Least Significant DT
* 14 High Precision
* 15 Low Precision
* 16 Elementary Item
* 17 Occurs
* 18 Key Column
* 19 Sub Data Type
*
Database type: ORACLE
Character set ID: windows-936
National character set ID: UTF-16
Locale: neutral
Case sensitivity: 14 14 14 14 14 14 14 14 14 14 14 14 11 14 14 14
*
Definition for table ZWC.GGTEST
Record length: 112
Syskey: 0
Columns: 2
COL1 64 50 0 0 0 1 0 50 50 50 0 0 0 0 1 0 1 2
COL2 64 50 56 0 0 1 0 50 50 0 0 0 0 0 1 0 0 0
End of definition
Copy DEFGEN File
As the replicat process needs details about the source database, we copy the generated definitions file located on our Oracle machine in the <GoldenGate home>/dirdef/GGTEST.def to the target machine where the Postgres database is installed into the <GoldenGate home>./dirdef/GGTEST.def directory.
[oracle@ggos ggs]$ scp dirdef/GGTEST.def postgres@ggpgt:/data/pgsql/ggs/dirdef
The authenticity of host 'ggpgt (192.168.1.235)' can't be established.
RSA key fingerprint is a2:87:27:d3:58:63:76:72:ab:d3:84:8e:43:fc:d7:be.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'ggpgt,192.168.1.235' (RSA) to the list of known hosts.
postgres@ggpgt's password:
GGTEST.def 100% 996 1.0KB/s 00:00
[oracle@ggos ggs]$
PostgreSQL replicat
Our extract process is set up to write all changes for the table GGTEST directly to the Postgres database machine into an extract file located in the dirdat directory. So we only need a process that reads those changes from the trail file and distributes it to the Postgres database. This process is called a replicat process running on the Postgres machine and it needs a parameter file
GGSCI (ggpgt) 6> view param rpos REPLICAT rpos
SOURCEDEFS /data/pgsql/ggs/dirdef/GGTEST.def
SETENV ( PGCLIENTENCODING = "UTF8" )
SETENV (ODBCINI="/data/pgsql/ggs/odbc.ini" )
SETENV (NLS_LANG="AMERICAN_AMERICA.AL32UTF8")
TARGETDB GG_Postgres, USERID zwc, PASSWORD zwc
DISCARDFILE /data/pgsql/ggs/dirrpt/diskg.dsc, purge
MAP ZWC.GGTEST, TARGET public.ggtest, COLMAP (COL1=col1,COL2=col2);
Create the replicat process, start it and verify if it is running
GGSCI (ggpgt) 8> add replicat rpos, NODBCHECKPOINT, exttrail /data/pgsql/ggs/dirdat/ep
REPLICAT added. GGSCI (ggpgt) 9> start rpos Sending START request to MANAGER ...
REPLICAT RPOS starting GGSCI (ggpgt) 10> info all Program Status Group Lag at Chkpt Time Since Chkpt MANAGER RUNNING
REPLICAT RUNNING RPOS 00:00:00 00:00:00 GGSCI (ggpgt) 11> info all Program Status Group Lag at Chkpt Time Since Chkpt MANAGER RUNNING
REPLICAT RUNNING RPOS 00:00:00 00:00:02 GGSCI (ggpgt) 12> view report rpos ***********************************************************************
Oracle GoldenGate Delivery
Version 11.2.1.0.2 OGGCORE_11.2.1.0.2T3_PLATFORMS_120724.2205
Linux, x64, 64bit (optimized), PostgreSQL on Jul 25 2012 01:37:05 Copyright (C) 1995, 2012, Oracle and/or its affiliates. All rights reserved. Starting at 2013-09-04 14:34:27
*********************************************************************** Operating System Version:
Linux
Version #1 SMP Fri Jul 22 04:43:29 EDT 2011, Release 2.6.18-274.el5
Node: ggpgt
Machine: x86_64
soft limit hard limit
Address Space Size : unlimited unlimited
Heap Size : unlimited unlimited
File Size : unlimited unlimited
CPU Time : unlimited unlimited Process id: 22305 Description: ***********************************************************************
** Running with the following parameters **
*********************************************************************** 2013-09-04 14:34:27 INFO OGG-03035 Operating system character set identified as UTF-8. Locale: en_US, LC_ALL:.
REPLICAT rpos
SOURCEDEFS /data/pgsql/ggs/dirdef/GGTEST.def
SETENV ( PGCLIENTENCODING = "UTF8" )
Set environment variable (PGCLIENTENCODING=UTF8)
SETENV (ODBCINI="/data/pgsql/ggs/odbc.ini" )
Set environment variable (ODBCINI=/data/pgsql/ggs/odbc.ini)
SETENV (NLS_LANG="AMERICAN_AMERICA.AL32UTF8")
Set environment variable (NLS_LANG=AMERICAN_AMERICA.AL32UTF8)
TARGETDB GG_Postgres, USERID zwc, PASSWORD *** 2013-09-04 14:34:27 INFO OGG-03036 Database character set identified as UTF-8. Locale: en_US. 2013-09-04 14:34:27 INFO OGG-03037 Session character set identified as UTF-8.
DISCARDFILE /data/pgsql/ggs/dirrpt/diskg.dsc, purge
MAP ZWC.GGTEST, TARGET public.ggtest, COLMAP (COL1=col1,COL2=col2); 2013-09-04 14:34:27 INFO OGG-01815 Virtual Memory Facilities for: COM
anon alloc: mmap(MAP_ANON) anon free: munmap
file alloc: mmap(MAP_SHARED) file free: munmap
target directories:
/data/pgsql/ggs/dirtmp. CACHEMGR virtual memory values (may have been adjusted)
CACHESIZE: 2G
CACHEPAGEOUTSIZE (normal): 8M
PROCESS VM AVAIL FROM OS (min): 4G
CACHESIZEMAX (strict force to disk): 3.41G Database Version:
PostgreSQL
Version 09.02.0004
ODBC Version 03.52.0000 Driver Information:
GGpsql25.so
Version 06.10.0068 (B0059, U0030)
ODBC Version 03.52 ***********************************************************************
** Run Time Messages **
*********************************************************************** Opened trail file /data/pgsql/ggs/dirdat/ep000000 at 2013-09-04 14:34:27
Testing the configuration
Finally we can now test the whole set up and insert a record into the Oracle database
[oracle@ggos ~]$ sqlplus zwc SQL*Plus: Release 11.2.0.4.0 Production on Wed Sep 4 22:38:16 2013 Copyright (c) 1982, 2013, Oracle. All rights reserved. Enter password: Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> insert into ggtest values(1,'Hi Zhong Weicheng'); 1 row created. SQL> commit; Commit complete. SQL> select * from ggtest; COL1 COL2
---------- --------------------------------------------------
1 Hi Zhong Weicheng
Check with a PostgreSQL tool if our newly inserted record is replicated
[postgres@ggpgt ggs]$ psql -U zwc -d repdb
psql (9.2.4)
Type "help" for help. repdb=> select * from ggtest;
col1 | col2
------+-------------------
1 | Hi Zhong Weicheng
(1 row) repdb=>
Check with GoldenGate tool logdump
[postgres@ggpgt ggs]$ ./logdump Oracle GoldenGate Log File Dump Utility
Version 11.2.1.0.2 OGGCORE_11.2.1.0.2T3_PLATFORMS_120724.2205 Copyright (C) 1995, 2012, Oracle and/or its affiliates. All rights reserved. Logdump 1 >open /data/pgsql/ggs/dirdat/ep000000
Current LogTrail is /data/pgsql/ggs/dirdat/ep000000
Logdump 2 >ghdr ON
Logdump 3 >headertoken on
Logdump 4 >usertoken on
Logdump 5 >detail on
Logdump 6 >detail data
Logdump 7 >n
TokenID x46 'F' Record Header Info xff80 Length 1050
TokenID x30 '0' TrailInfo Info x00 Length 429
TokenID x31 '1' MachineInfo Info x00 Length 102
TokenID x32 '2' DatabaseInfo Info x00 Length 357
TokenID x33 '3' ProducerInfo Info x00 Length 126
TokenID x34 '4' ContinunityInfo Info x00 Length 8
TokenID x5a 'Z' Record Trailer Info xff80 Length 1050 2013/09/04 22:07:34.254.624 FileHeader Len 1042 RBA 0
Name: *FileHeader*
3000 01ad 3000 0008 4747 0d0a 544c 0a0d 3100 0002 | 0...0...GG..TL..1...
0003 3200 0004 2000 0000 3300 0008 02f2 0bc2 c871 | ..2... ...3........q
2820 3400 0023 0021 7572 693a 6767 6f73 3a3a 7530 | ( 4..#.!uri:ggos::u0
313a 6170 703a 6f72 6163 6c65 3a67 6773 3a45 504f | 1:app:oracle:ggs:EPO
5336 0000 2100 1f2f 6461 7461 2f70 6773 716c 2f67 | S6..!../data/pgsql/g
6773 2f64 6972 6461 742f 6570 3030 3030 3030 3700 | gs/dirdat/ep0000007.
0001 0138 0000 0400 0000 0039 ff00 0800 0000 0000 | ...8.......9........ Logdump 8 >n
TokenID x47 'G' Record Header Info x01 Length 145
TokenID x48 'H' GHDR Info x00 Length 45
TokenID x44 'D' Data Info x00 Length 34
TokenID x54 'T' GGS Tokens Info x00 Length 46
TokenID x5a 'Z' Record Trailer Info x01 Length 145
___________________________________________________________________
Hdr-Ind : E (x45) Partition : . (x04)
UndoFlag : . (x00) BeforeAfter: A (x41)
RecLength : 34 (x0022) IO Time : 2013/09/04 14:38:19.020.741
IOType : 5 (x05) OrigNode : 255 (xff)
TransInd : . (x03) FormatType : R (x52)
SyskeyLen : 0 (x00) Incomplete : . (x00)
AuditRBA : 7 AuditPos : 18997776
Continued : N (x00) RecCount : 1 (x01) 2013/09/04 14:38:19.020.741 Insert Len 34 RBA 1050
Name: ZWC.GGTEST
After Image: Partition 4 G s
0000 0005 0000 0001 3100 0100 1500 0000 1148 6920 | ........1........Hi
5a68 6f6e 6720 5765 6963 6865 6e67 | Zhong Weicheng
Column 0 (x0000), Len 5 (x0005)
0000 0001 31 | ....1
Column 1 (x0001), Len 21 (x0015)
0000 0011 4869 205a 686f 6e67 2057 6569 6368 656e | ....Hi Zhong Weichen
67 | g