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首頁 云原生數(shù)據(jù)庫 PolarDB 云原生數(shù)據(jù)庫PolarDB分布式版 用戶指南 日志服務(wù)（Binlog） 使用服務(wù) 使用SQL語句操作PolarDB-X的binlog

使用SQL語句操作PolarDB-X的binlog

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SQL介紹

PolarDB-X提供了兼容MySQL的SQL語法，可以對binlog文件進(jìn)行查看和操作。

多流binlog的SQL兼容

如上所列的SHOW BINARY LOGS、SHOW BINLOG EVENTS、SHOW MASTER STATUS是最常用的3個SQL命令，適配MySQL binlog的很多生態(tài)工具在程序代碼中也多有使用。

針對多流binlog，PolarDB-X對這3個SQL命令進(jìn)行了語法擴展，可以通過指定with選項，針對特定的流或流組進(jìn)行操作。但眾多的生態(tài)工具并不支持該擴展語法，推進(jìn)生態(tài)工具適配PolarDB-X的擴展語法也需要較長的實施周期（Alibaba canal已經(jīng)實現(xiàn)了適配），對此，PolarDB-X提供了一種將賬號和binlog流進(jìn)行綁定的機制，來實現(xiàn)0改造即可使用binlog多流服務(wù)。

使用限制

  • 大于等于5.4.19的版本才支持該綁定機制。

  • 如果不想開啟綁定機制，在PolarDB-X命令行執(zhí)行set global ENABLE_EXTRACT_STREAM_NAME_FROM_USER = false。

使用方法

  1. 通過show binary stream查看所有的流信息。

    show binary streams;
+--------+-----------------+-------------------------------+----------+
| GROUP  | STREAM          | FILE                          | POSITION |
+--------+-----------------+-------------------------------+----------+
| group1 | group1_stream_0 | group1_stream_0_binlog.000438 |     6690 |
| group1 | group1_stream_1 | group1_stream_1_binlog.000440 |     6690 |
| group1 | group1_stream_2 | group1_stream_2_binlog.000452 |     6690 |
| group1 | group1_stream_3 | group1_stream_3_binlog.000449 |     6690 |
+--------+-----------------+-------------------------------+----------+

  2. 為每條流創(chuàng)建一個綁定賬號并授予合適的權(quán)限，賬號的命名規(guī)則為： 流名稱 + _cdc_user后綴，如下所示

    CREATE USER IF NOT EXISTS 'group1_stream_0_cdc_user'@'%' identified by '123456';
CREATE USER IF NOT EXISTS 'group1_stream_1_cdc_user'@'%' identified by '123456';
CREATE USER IF NOT EXISTS 'group1_stream_2_cdc_user'@'%' identified by '123456';
CREATE USER IF NOT EXISTS 'group1_stream_3_cdc_user'@'%' identified by '123456';

grant ALL PRIVILEGES on *.* to 'group1_stream_0_cdc_user'@'%';
grant ALL PRIVILEGES on *.* to 'group1_stream_1_cdc_user'@'%';
grant ALL PRIVILEGES on *.* to 'group1_stream_2_cdc_user'@'%';
grant ALL PRIVILEGES on *.* to 'group1_stream_3_cdc_user'@'%';

  3. 使用創(chuàng)建的賬號登錄PolarDB-X，并執(zhí)行SHOW BINARY LOGS、SHOW BINLOG EVENTS、SHOW MASTER STATUS，對返回內(nèi)容進(jìn)行驗證，返回內(nèi)容如果對應(yīng)的是當(dāng)前登錄賬號中包含的binlog流的信息，則符合預(yù)期。

示例

SHOW BINARY LOGS

  • 使用普通賬號執(zhí)行show binary logs

    select user();
+-------------------------+
| USER()                  |
+-------------------------+
| polardbx_root@127.0.0.1 |
+-------------------------+
1 row in set (0.00 sec)

show binary logs;
+---------------+-----------+
| LOG_NAME      | FILE_SIZE |
+---------------+-----------+
| binlog.000001 |       260 |
| binlog.000002 |      6031 |
| binlog.000003 |      3046 |
| binlog.000004 |      6827 |
| binlog.000005 |      3046 |
| binlog.000006 |    612906 |
| binlog.000007 |   3440227 |
| binlog.000008 |  10486619 |
| binlog.000009 |   6825583 |
| binlog.000010 |      3245 |
+---------------+-----------+

  • 使用普通賬號加with選項執(zhí)行show binary logs

    select user();
+-------------------------+
| USER()                  |
+-------------------------+
| polardbx_root@127.0.0.1 |
+-------------------------+
1 row in set (0.00 sec)

show binary logs with 'group1_stream_0';
+-------------------------------+-----------+
| LOG_NAME                      | FILE_SIZE |
+-------------------------------+-----------+
| group1_stream_0_binlog.000001 |       276 |
| group1_stream_0_binlog.000002 |      8634 |
| group1_stream_0_binlog.000003 |      9629 |
| group1_stream_0_binlog.000004 |    615708 |
| group1_stream_0_binlog.000005 |   8775293 |
| group1_stream_0_binlog.000006 |     10027 |
| group1_stream_0_binlog.000007 |      9430 |
| group1_stream_0_binlog.000008 |     13437 |
| group1_stream_0_binlog.000009 |     10049 |
| group1_stream_0_binlog.000010 |      9629 |
+-------------------------------+-----------+

  • 使用綁定賬號執(zhí)行show binary logs

    select user();
+------------------------------------+
| USER()                             |
+------------------------------------+
| group1_stream_0_cdc_user@127.0.0.1 |
+------------------------------------+
1 row in set (0.00 sec)

show binary logs;
+-------------------------------+-----------+
| LOG_NAME                      | FILE_SIZE |
+-------------------------------+-----------+
| group1_stream_0_binlog.000001 |       276 |
| group1_stream_0_binlog.000002 |      8634 |
| group1_stream_0_binlog.000003 |      9629 |
| group1_stream_0_binlog.000004 |    615708 |
| group1_stream_0_binlog.000005 |   8775293 |
| group1_stream_0_binlog.000006 |     10027 |
| group1_stream_0_binlog.000007 |      9430 |
| group1_stream_0_binlog.000008 |     13437 |
| group1_stream_0_binlog.000009 |     10049 |
| group1_stream_0_binlog.000010 |      9629 |
+-------------------------------+-----------+

SHOW MASTER STATUS

  • 使用普通賬號執(zhí)行show master status

    select user();
+-------------------------+
| USER()                  |
+-------------------------+
| polardbx_root@127.0.0.1 |
+-------------------------+
1 row in set (0.00 sec)

show master status;
+---------------+----------+--------------+------------------+-------------------+
| FILE          | POSITION | BINLOG_DO_DB | BINLOG_IGNORE_DB | EXECUTED_GTID_SET |
+---------------+----------+--------------+------------------+-------------------+
| binlog.001219 |     4899 |              |                  |                   |
+---------------+----------+--------------+------------------+-------------------+

  • 使用普通賬號加with選項執(zhí)行show master status

    select user();
+-------------------------+
| USER()                  |
+-------------------------+
| polardbx_root@127.0.0.1 |
+-------------------------+
1 row in set (0.00 sec)

show master status with 'group1_stream_0';
+-------------------------------+----------+--------------+------------------+-------------------+
| FILE                          | POSITION | BINLOG_DO_DB | BINLOG_IGNORE_DB | EXECUTED_GTID_SET |
+-------------------------------+----------+--------------+------------------+-------------------+
| group1_stream_0_binlog.000442 |    10840 |              |                  |                   |
+-------------------------------+----------+--------------+------------------+-------------------+

  • 使用綁定賬號執(zhí)行show master status

    select user();
+------------------------------------+
| USER()                             |
+------------------------------------+
| group1_stream_0_cdc_user@127.0.0.1 |
+------------------------------------+
1 row in set (0.00 sec)

show master status;
+-------------------------------+----------+--------------+------------------+-------------------+
| FILE                          | POSITION | BINLOG_DO_DB | BINLOG_IGNORE_DB | EXECUTED_GTID_SET |
+-------------------------------+----------+--------------+------------------+-------------------+
| group1_stream_0_binlog.000443 |     1118 |              |                  |                   |
+-------------------------------+----------+--------------+------------------+-------------------+

SHOW BINLOG EVENTS

  • 使用普通賬號執(zhí)行show binlog events

    select user();
+-------------------------+
| USER()                  |
+-------------------------+
| polardbx_root@127.0.0.1 |
+-------------------------+
1 row in set (0.00 sec)

show binlog events limit 5;
+---------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+
| LOG_NAME      | POS  | EVENT_TYPE  | SERVER_ID  | END_LOG_POS | INFO                                                                  |
+---------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+
| binlog.000001 |    4 | Format_desc | 3189545694 |         123 | Server ver: 5.6.29-TDDL-5.4.19-SNAPSHOT, Binlog ver: 4                |
| binlog.000001 |  123 | Rows_query  | 3189545694 |         216 | CTS::718558471351435270417166499290336542720000000000000000::FlushLog |
| binlog.000001 |  216 | Rotate      | 3189545694 |         260 | binlog.000002;pos=4                                                   |
+---------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+

  • 使用普通賬號加with選項執(zhí)行show binlog events

    select user();
+-------------------------+
| USER()                  |
+-------------------------+
| polardbx_root@127.0.0.1 |
+-------------------------+
1 row in set (0.00 sec)

show binlog events with 'group1_stream_0' limit 5;
+-------------------------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+
| LOG_NAME                      | POS  | EVENT_TYPE  | SERVER_ID  | END_LOG_POS | INFO                                                                  |
+-------------------------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+
| group1_stream_0_binlog.000001 |    4 | Format_desc | 3189545694 |         123 | Server ver: 5.6.29-TDDL-5.4.19-SNAPSHOT, Binlog ver: 4                |
| group1_stream_0_binlog.000001 |  123 | Rows_query  | 3189545694 |         216 | CTS::718558434551031404817166495609667010560000000000000000::FlushLog |
| group1_stream_0_binlog.000001 |  216 | Rotate      | 3189545694 |         276 | group1_stream_0_binlog.000002;pos=4                                   |
+-------------------------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+

  • 使用綁定賬號執(zhí)行show binlog events

    select user();
+------------------------------------+
| USER()                             |
+------------------------------------+
| group1_stream_0_cdc_user@127.0.0.1 |
+------------------------------------+
1 row in set (0.00 sec)

show binlog events limit 5;
+-------------------------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+
| LOG_NAME                      | POS  | EVENT_TYPE  | SERVER_ID  | END_LOG_POS | INFO                                                                  |
+-------------------------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+
| group1_stream_0_binlog.000001 |    4 | Format_desc | 3189545694 |         123 | Server ver: 5.6.29-TDDL-5.4.19-SNAPSHOT, Binlog ver: 4                |
| group1_stream_0_binlog.000001 |  123 | Rows_query  | 3189545694 |         216 | CTS::718558434551031404817166495609667010560000000000000000::FlushLog |
| group1_stream_0_binlog.000001 |  216 | Rotate      | 3189545694 |         276 | group1_stream_0_binlog.000002;pos=4                                   |
+-------------------------------+------+-------------+------------+-------------+-----------------------------------------------------------------------+