文档目录

ADMIN CHECKSUM TABLE

ADMIN CHECKSUM TABLE 语句用于计算表中所有行和索引的 CRC64 校验和。在 TiDB Lightning 等程序中,可通过此语句来确保导入操作成功。

语法图

AdminStmt:

AdminStmt

TableNameList:

TableNameList

示例

计算表 t1 的校验和:

CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY auto_increment);
INSERT INTO t1 VALUES (1),(2),(3);
ADMIN CHECKSUM TABLE t1;
CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY auto_increment);
Query OK, 0 rows affected (0.11 sec)

INSERT INTO t1 VALUES (1),(2),(3);
Query OK, 3 rows affected (0.02 sec)
Records: 3  Duplicates: 0  Warnings: 0

ADMIN CHECKSUM TABLE t1;
+---------+------------+----------------------+-----------+-------------+
| Db_name | Table_name | Checksum_crc64_xor   | Total_kvs | Total_bytes |
+---------+------------+----------------------+-----------+-------------+
| test    | t1         | 10909174369497628533 |         3 |          75 |
+---------+------------+----------------------+-----------+-------------+
1 row in set (0.00 sec)

MySQL 兼容性

ADMIN CHECKSUM TABLE 语句是 TiDB 对 MySQL 语法的扩展。