update DATA_LENGTH

pingcap · Nov 23, 2023 · 5751a40 · 5751a40
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diff --git a/dm/dm-hardware-and-software-requirements.md b/dm/dm-hardware-and-software-requirements.md
@@ -54,7 +54,7 @@ The target TiKV cluster must have enough disk space to store the imported data.
 - Indexes might take extra space.
 - RocksDB has a space amplification effect.
 
-You can estimate the data volume by using the following SQL statements to summarize the `data-length` field:
+You can estimate the data volume by using the following SQL statements to summarize the `DATA_LENGTH` field:
 
 - Calculate the size of all schemas, in MiB. Replace `${schema_name}` with your schema name.
 

diff --git a/migrate-large-mysql-to-tidb.md b/migrate-large-mysql-to-tidb.md
@@ -29,7 +29,7 @@ This document describes how to perform the full migration using Dumpling and TiD
 - During the import, TiDB Lightning needs temporary space to store the sorted key-value pairs. The disk space should be enough to hold the largest single table from the data source.
 - If the full data volume is large, you can increase the binlog storage time in the upstream. This is to ensure that the binlogs are not lost during the incremental replication.
 
-**Note**: It is difficult to calculate the exact data volume exported by Dumpling from MySQL, but you can estimate the data volume by using the following SQL statement to summarize the `data-length` field in the `information_schema.tables` table:
+**Note**: It is difficult to calculate the exact data volume exported by Dumpling from MySQL, but you can estimate the data volume by using the following SQL statement to summarize the `DATA_LENGTH` field in the `information_schema.tables` table:
 
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diff --git a/tidb-lightning/tidb-lightning-requirements.md b/tidb-lightning/tidb-lightning-requirements.md
@@ -84,7 +84,7 @@ The target TiKV cluster must have enough disk space to store the imported data.
 - Indexes might take extra space.
 - RocksDB has a space amplification effect.
 
-It is difficult to calculate the exact data volume exported by Dumpling from MySQL. However, you can estimate the data volume by using the following SQL statement to summarize the data-length field in the information_schema.tables table:
+It is difficult to calculate the exact data volume exported by Dumpling from MySQL. However, you can estimate the data volume by using the following SQL statement to summarize the `DATA_LENGTH` field in the information_schema.tables table:
 
 Calculate the size of all schemas, in MiB. Replace ${schema_name} with your schema name.