今天就跟大家聊聊有关Oracle_CDC该怎么部署，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
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1. CDC的实施步骤(异步在线日志)
1.1. 数据库初始化
SQL>
alter system set
job_queue_processes = 100;
alter system set
java_pool_size = 50m;
alter system set
streams_pool_size=50m;
alter system set
undo_retention=3600;
alter database
force logging;
alter database
add supplemental log data;
select
LOG_MODE,FORCE_LOGGING,SUPPLEMENTAL_LOG_DATA_MIN from v$database;
1.2. 准备测试表
SQL>
create table scott.test(id
int,name varchar2(30),mark varchar2(50));
1.3. 创建发布者
SQL>
conn / as
sysdba;
create
tablespace cdc_tbsp;
create user
cdc_publisher identified by cdc_publisher default tablespace cdc_tbsp temporary
tablespace temp;
GRANT CREATE
SESSION TO cdc_publisher;
GRANT CREATE TABLE
TO cdc_publisher;
grant create
sequence TO cdc_publisher;
grant create
procedure TO cdc_publisher;
grant create any
job TO cdc_publisher;
GRANT CREATE
TABLESPACE TO cdc_publisher;
GRANT UNLIMITED
TABLESPACE TO cdc_publisher;
GRANT
SELECT_CATALOG_ROLE TO cdc_publisher;
GRANT
EXECUTE_CATALOG_ROLE TO cdc_publisher;
GRANT EXECUTE ON
DBMS_CDC_PUBLISH TO cdc_publisher;
grant execute ON
dbms_lock TO cdc_publisher;
execute
dbms_streams_auth.grant_admin_privilege('CDC_PUBLISHER');
grant all on
scott.test to cdc_publisher;
grant dba to
cdc_publisher;
1.4. 创建订阅者
SQL>
create user
cdc_subscriber identified by cdc_subscriber default tablespace cdc_tbsp
temporary tablespace temp;
grant create
session TO cdc_subscriber;
grant resource
to cdc_subscriber;
grant connect to
cdc_subscriber;
GRANT CREATE
TABLE TO cdc_subscriber;
GRANT CREATE
VIEW TO cdc_subscriber;
GRANT UNLIMITED
TABLESPACE TO cdc_subscriber;
1.5. 发布数据
1.5.1. 发布-准备源表
SQL>
conn
cdc_publisher/cdc_publisher;
BEGIN
DBMS_CAPTURE_ADM.PREPARE_TABLE_INSTANTIATION(TABLE_NAME
=> 'scott.test');
END;
/
1.5.2. 发布-创建变更集
SQL>
conn
cdc_publisher/cdc_publisher;
BEGIN
DBMS_CDC_PUBLISH.CREATE_CHANGE_SET(
change_set_name
=> 'CDC_SCOTT_TEST',
description
=> 'Change set for product info',
change_source_name
=> 'HOTLOG_SOURCE',
stop_on_ddl
=> 'y');
END;
/
注意：
change_source_name参数:
同步模式中必须为：SYNC_SOURCE
异步在线日志模式必须为：HOTLOG_SOURCE
1.5.3. 发布-创建变更表
SQL>
conn
cdc_publisher/cdc_publisher;
BEGIN
DBMS_CDC_PUBLISH.CREATE_CHANGE_TABLE(
owner => 'cdc_publisher',
change_table_name => 'cdc_test',
change_set_name => 'CDC_SCOTT_TEST',
source_schema => 'SCOTT',
source_table => 'TEST',
column_type_list => 'ID NUMBER(5), NAME VARCHAR2(30),MARK
VARCHAR2(50)',
capture_values => 'both',
rs_id => 'y',
row_id => 'n',
user_id => 'n',
timestamp => 'n',
object_id => 'n',
source_colmap => 'n',
target_colmap => 'y',
options_string => 'TABLESPACE CDC_TBSP');
END;
/
注意：
owner是指发布用户
source_schema是源表所属用户
同步模式需加参数ddl_markers
=> 'n'
options_string指定改变表的存储参数，可以使用除partition以外的所有create table中指定的存储参数，如tablespace、pctfree 等。
1.5.4. 发布-激活变更集
SQL>
conn
cdc_publisher/cdc_publisher;
BEGIN
DBMS_CDC_PUBLISH.ALTER_CHANGE_SET(
change_set_name => 'CDC_SCOTT_TEST',
enable_capture => 'y');
END;
/
1.5.5. 授权变更表给订阅者
conn
cdc_publisher/cdc_publisher;
grant select
on cdc_test to cdc_subscriber;
备注：
到此cdc_subscriber用户已经可以检测到scott.test表的变更了
测试：
$ sqlplus
scott/tiger
SQL>
insert into scott.test
values(1,'beijing','11');
commit;
update scott.test
set name='shanghai' where id=1;
commit;
delete scott.test
where id=1;
commit;
SQL>
conn
cdc_subscriber/cdc_subscriber
SQL> select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from cdc_publisher.cdc_test
t;
OPERATION$
COMMIT_TIMESTAMP$ ID NAME
MARK
----------
---------- ------ ----------- ------------------------------
I 2018/2/8 20:04:58 1 beijing 11
UO 2018/2/8 20:04:58 1 beijing 11
UN 2018/2/8 20:04:58 1 shanghai 11
D 2018/2/8 20:04:58 1 shanghai 11
备注：operation 的意思
此列中的值可以是下列任何一个脚1:
I: 指示此行表示插入操作
: 指示此行表示以下情况下更新的源表行的前映像: UO
异步更改数据捕获
当更改表包括基于主键的对象 ID, 而不是主键的捕获列已更改时, 同步更改数据捕获。
UU: 指示此行表示更新的源表行的前图像, 用于同步更改数据捕获, 而不是由. UO.
UN: 指示此行表示更新的源表行的后映像。
D: 指示此行表示删除操作。
当发布者发布了相关的改变表后，会生成一个惟一的发布id( publication ID)， 可以查阅视图ALL_PUBLISHED_COLUMNS以获取已经发布的表及字段信息
SQL> conn
CDC_PUBLISHER/CDC_PUBLISHER;
select
change_set_name,pub_id,source_table_name from ALL_PUBLISHED_COLUMNS ;
CHANGE_SET_NAME PUB_ID SOURCE_TABLE_NAME
------------------------------
---------- ------------------------------
CDC_SCOTT_TEST 91956 TEST
CDC_SCOTT_TEST 91956 TEST
CDC_SCOTT_TEST 91956 TEST
1.6. 订阅
1.6.1. 订阅-创建订阅集
SQL>
conn
cdc_subscriber/cdc_subscriber
BEGIN
dbms_cdc_subscribe.create_subscription(
change_set_name=>'CDC_SCOTT_TEST',
description=>'cdc scott subx',
subscription_name=>'CDC_SCOTT_SUB');
END;
/
备注：
一次订阅与改变集对应,由于改变集与源表之间是一对多的关系,所以一次订阅就可以订阅多张表.
1.6.2. 订阅-开始订阅数据
SQL>
BEGIN
dbms_cdc_subscribe.subscribe(
subscription_name=>'CDC_SCOTT_SUB',
source_schema=>'SCOTT',
source_table=>'TEST',
column_list=>'ID, NAME,MARK',
subscriber_view=>'TEST_TEMP');
END;
/
SQL> select
view_name,text from user_views;
VIEW_NAME TEXT
---------------
----------------------------------------
TEST_TEMP SELECT
OPERATION$, CSCN$, COMMIT_TIMESTAMP$, XIDUSN$, XIDSLT$, XIDSEQ$, DDLDES
备注：
如果改变集中有多个表,需要操作多次
1.6.3. 订阅-激活订阅
SQL>
BEGIN
dbms_cdc_subscribe.activate_subscription(
subscription_name=>'CDC_SCOTT_SUB');
END;
/
1.6.4. 订阅-扩展订阅窗口
SQL>
conn
cdc_subscriber/cdc_subscriber;
BEGIN
dbms_cdc_subscribe.extend_window(
subscription_name=>'CDC_SCOTT_SUB');
END;
/
备注：
订阅调用DBMS_CDC_SUBSCRIBE.EXTEND_WINDOW过程取得改变数据的集合,如果第一次执行,就取得激活订阅后所有改变数据.每次执行DBMS_CDC_SUBSCRIBE.EXTEND_WINDOW后,扩展窗口只看到上次执行DBMS_CDC_SUBSCRIBE.EXTEND_WINDOW至今的数据.
1.6.5. 查看订阅内容
SQL>
conn
cdc_subscriber/cdc_subscriber;
SQL> select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from test_temp t;
OPERATION$
COMMIT_TIMESTAMP$ ID NAME MARK
----------
----------------- ------ ------------------------------
--------------------------------------------------
I 2018/2/8 20:04:58 1
beijing 11
UO 2018/2/8 20:04:58 1 beijing 11
UN 2018/2/8 20:04:58 1 shanghai 11
D 2018/2/8 20:04:58 1 shanghai 11
1.7. 测试
1.7.1. 源表变更
SQL> conn
scott/tiger;
insert into test
values(2,'renqinglei','aa');
commit;
update test set
mark='tt' where id=2;
commit;
delete test
where id=2;
commit;
1.7.2. 查询数据发布情况
SQL> conn
cdc_publisher/cdc_publisher
select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from cdc_publisher.cdc_test
t;
OP
COMMIT_TIMESTAMP$ ID NAME MARK
--
------------------ ---------- ------------------------------
I 13-JAN-16 1 beijing 11
UO
13-JAN-16 1
beijing 11
UN
13-JAN-16 1
shanghai 11
D 13-JAN-16 1 shanghai 11
I 13-JAN-16 2 renqinglei aa
UO
13-JAN-16 2
renqinglei aa
UN
13-JAN-16 2
renqinglei tt
D 13-JAN-16 2 renqinglei tt
1.7.3. 查询数据订阅情况
SQL> conn
cdc_subscriber/cdc_subscriber
select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from test_temp t;
OP
COMMIT_TIMESTAMP$ ID NAME MARK
--
------------------ ---------- ------------------------------
I 13-JAN-16 1 beijing 11
UO
13-JAN-16 1
beijing 11
UN
13-JAN-16 1 shanghai 11
D 13-JAN-16 1 shanghai 11.
1.7.4. 发现订阅的数据没有变化,扩展一下订阅窗口:
SQL> conn
cdc_subscriber/cdc_subscriber
BEGIN
dbms_cdc_subscribe.extend_window(
subscription_name=>'CDC_SCOTT_SUB');
END;
/
select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from test_temp t;
OPERATION$
COMMIT_TIMESTAMP$ ID
NAME MARK
----------
----------------- ------ ------------------------------ ----------
I 2018/2/8 20:04:58 1 beijing 11
UO 2018/2/8 20:04:58 1 beijing 11
UN 2018/2/8 20:04:58 1 shanghai 11
D 2018/2/8 20:04:58 1 shanghai 11
I 2018/2/8 20:26:01 2 renqinglei aa
UO 2018/2/8 20:26:01 2 renqinglei aa
UN 2018/2/8 20:26:01 2 renqinglei tt
D 2018/2/8 20:26:01 2 renqinglei tt
1.7.5. 清除变更数据集
SQL> conn
cdc_subscriber/cdc_subscriber
BEGIN
DBMS_CDC_SUBSCRIBE.PURGE_WINDOW(
subscription_name => 'CDC_SCOTT_SUB');
END;
/
查看订阅数据为空
select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from test_temp t;
备注:
扩展窗口的数据可以进行清空操作，避免改变数据过多带来的系统负载。
1.7.6. 重新生成变化数据
conn scott/tiger;
insert into test
values(3,'shandong','hh');
insert into test
values(4,'diankeyuan','hh');
commit;
查看发布信息
conn
cdc_publisher/cdc_publisher
select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from cdc_publisher.cdc_test
t;
OPERATION$
COMMIT_TIMESTAMP$ ID NAME MARK
----------
----------------- ------ ------------------------------ ------------------ 2018/2/8 20:04:58 1 beijing 11
UO 2018/2/8 20:04:58 1 beijing 11
UN 2018/2/8 20:04:58 1 shanghai 11
D 2018/2/8 20:04:58 1 shanghai 11
I 2018/2/8 20:26:01 2 renqinglei aa
UO 2018/2/8 20:26:01 2 renqinglei aa
UN 2018/2/8 20:26:01 2 renqinglei tt
D 2018/2/8 20:26:01 2 renqinglei tt
I 2018/2/8 20:33:48 3 shandong hh
I 2018/2/8 20:33:48 4 diankeyuan hh
SQL> conn
cdc_subscriber/cdc_subscriber;
BEGIN
dbms_cdc_subscribe.extend_window(
subscription_name=>'CDC_SCOTT_SUB');
END;
/
查看订阅信息
select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from test_temp t;
OPERATION$
COMMIT_TIMESTAMP$ ID NAME MARK
----------
---------- ------ -------------- ---------------------------------
I 2018/2/8 20:33:48 3 shandong hh
I 2018/2/8 20:33:48 4 diankeyuan hh
1.7.7. 删除发布的数据
SQL>
conn
cdc_publisher/cdc_publisher
select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from cdc_publisher.cdc_test
t;
OP
COMMIT_TIMESTAMP$ ID NAME MARK
--
------------------ ---------- ------------------------------
I 13-JAN-16 1 beijing 11
UO 13-JAN-16 1 beijing 11
UN
13-JAN-16 1
shanghai 11
D 13-JAN-16 1 shanghai 11
I 13-JAN-16 2 renqinglei aa
UO
13-JAN-16 2
renqinglei aa
UN
13-JAN-16 2
renqinglei tt
D 13-JAN-16 2 renqinglei tt
I 13-JAN-16 3 shandong hh
I 13-JAN-16 4 diankeyuan hh
rows selected.
不可truncate
SQL> truncate
cdc_test;
ERROR at line 1:
ORA-03290:
Invalid truncate command - missing CLUSTER or TABLE keyword
删除后无记录
SQL>
delete cdc_test;
commit;
select
t.operation$,t.commit_timestamp$,t.id,t.name,t.mark from cdc_publisher.cdc_test
t;
看完上述内容，你们对Oracle_CDC该怎么部署有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注创新互联行业资讯频道，感谢大家的支持。
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