diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/flush/CompressionRatio.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/flush/CompressionRatio.java
index 2f1e173f249c..5ccdfb6d8133 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/flush/CompressionRatio.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/flush/CompressionRatio.java
@@ -144,11 +144,18 @@ void restore() throws IOException {
       int maxRatioIndex = 0;
       for (int i = 0; i < ratioFiles.length; i++) {
         String[] fileNameArray = ratioFiles[i].getName().split("-");
-        long diskSize = Long.parseLong(fileNameArray[2]);
-        if (diskSize > totalDiskSize) {
-          totalMemorySize = new AtomicLong(Long.parseLong(fileNameArray[1]));
-          totalDiskSize = diskSize;
-          maxRatioIndex = i;
+        // fileNameArray.length != 3 means the compression ratio may be negative, ignore it
+        if (fileNameArray.length == 3) {
+          try {
+            long diskSize = Long.parseLong(fileNameArray[2]);
+            if (diskSize > totalDiskSize) {
+              totalMemorySize = new AtomicLong(Long.parseLong(fileNameArray[1]));
+              totalDiskSize = diskSize;
+              maxRatioIndex = i;
+            }
+          } catch (NumberFormatException ignore) {
+            // ignore illegal compression file name
+          }
         }
       }
       LOGGER.debug(
@@ -165,11 +172,18 @@ void restore() throws IOException {
         totalDiskSize = 1;
         for (int i = 0; i < ratioFilesBeforeV121.length; i++) {
           String[] fileNameArray = ratioFilesBeforeV121[i].getName().split("-");
-          double currentCompressRatio =
-              Double.parseDouble(fileNameArray[1]) / Double.parseDouble(fileNameArray[2]);
-          if (getRatio() < currentCompressRatio) {
-            totalMemorySize = new AtomicLong((long) currentCompressRatio);
-            maxRatioIndex = i;
+          // fileNameArray.length != 3 means the compression ratio may be negative, ignore it
+          if (fileNameArray.length == 3) {
+            try {
+              double currentCompressRatio =
+                  Double.parseDouble(fileNameArray[1]) / Double.parseDouble(fileNameArray[2]);
+              if (getRatio() < currentCompressRatio) {
+                totalMemorySize = new AtomicLong((long) currentCompressRatio);
+                maxRatioIndex = i;
+              }
+            } catch (NumberFormatException ignore) {
+              // ignore illegal compression file name
+            }
           }
         }
         deleteRedundantFilesByIndex(ratioFilesBeforeV121, maxRatioIndex);
@@ -201,10 +215,6 @@ void reset() throws IOException {
     totalDiskSize = 0L;
   }
 
-  public static void decreaseDuplicatedMemorySize(long size) {
-    totalMemorySize.addAndGet(-size);
-  }
-
   public static CompressionRatio getInstance() {
     return CompressionRatioHolder.INSTANCE;
   }
diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/AlignedWritableMemChunk.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/AlignedWritableMemChunk.java
index 934b616e393e..959dd93201f3 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/AlignedWritableMemChunk.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/AlignedWritableMemChunk.java
@@ -19,10 +19,8 @@
 
 package org.apache.iotdb.db.storageengine.dataregion.memtable;
 
-import org.apache.iotdb.db.storageengine.dataregion.flush.CompressionRatio;
 import org.apache.iotdb.db.storageengine.dataregion.wal.buffer.IWALByteBufferView;
 import org.apache.iotdb.db.storageengine.dataregion.wal.utils.WALWriteUtils;
-import org.apache.iotdb.db.utils.MemUtils;
 import org.apache.iotdb.db.utils.datastructure.AlignedTVList;
 import org.apache.iotdb.db.utils.datastructure.TVList;
 import org.apache.iotdb.tsfile.common.conf.TSFileDescriptor;
@@ -389,17 +387,6 @@ public void encode(IChunkWriter chunkWriter) {
                   list.getValueIndex(sortedRowIndex);
             }
             if (timeDuplicateInfo[sortedRowIndex]) {
-              if (!list.isNullValue(list.getValueIndex(sortedRowIndex), columnIndex)) {
-                long recordSize =
-                    MemUtils.getRecordSize(
-                        tsDataType,
-                        tsDataType == TSDataType.TEXT
-                            ? list.getBinaryByValueIndex(
-                                list.getValueIndex(sortedRowIndex), columnIndex)
-                            : null,
-                        true);
-                CompressionRatio.decreaseDuplicatedMemorySize(recordSize);
-              }
               continue;
             }
           }
diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/WritableMemChunk.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/WritableMemChunk.java
index 134bf4310e95..d1bedabe9163 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/WritableMemChunk.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/WritableMemChunk.java
@@ -20,9 +20,7 @@
 
 import org.apache.iotdb.db.conf.IoTDBConfig;
 import org.apache.iotdb.db.conf.IoTDBDescriptor;
-import org.apache.iotdb.db.storageengine.dataregion.flush.CompressionRatio;
 import org.apache.iotdb.db.storageengine.dataregion.wal.buffer.IWALByteBufferView;
-import org.apache.iotdb.db.utils.MemUtils;
 import org.apache.iotdb.db.utils.datastructure.TVList;
 import org.apache.iotdb.tsfile.exception.write.UnSupportedDataTypeException;
 import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
@@ -332,12 +330,6 @@ public void encode(IChunkWriter chunkWriter) {
 
       // skip duplicated data
       if ((sortedRowIndex + 1 < list.rowCount() && (time == list.getTime(sortedRowIndex + 1)))) {
-        long recordSize =
-            MemUtils.getRecordSize(
-                tsDataType,
-                tsDataType == TSDataType.TEXT ? list.getBinary(sortedRowIndex) : null,
-                true);
-        CompressionRatio.decreaseDuplicatedMemorySize(recordSize);
         continue;
       }
 
diff --git a/iotdb-core/datanode/src/test/java/org/apache/iotdb/db/storageengine/dataregion/flush/CompressionRatioTest.java b/iotdb-core/datanode/src/test/java/org/apache/iotdb/db/storageengine/dataregion/flush/CompressionRatioTest.java
index ccbca71a3232..94e32133f9c5 100644
--- a/iotdb-core/datanode/src/test/java/org/apache/iotdb/db/storageengine/dataregion/flush/CompressionRatioTest.java
+++ b/iotdb-core/datanode/src/test/java/org/apache/iotdb/db/storageengine/dataregion/flush/CompressionRatioTest.java
@@ -104,4 +104,40 @@ public void testRestore() throws IOException {
     // largest diskSize to the memory
     assertEquals(2, compressionRatio.getRatio(), 0.1);
   }
+
+  @Test
+  public void testRestoreIllegal1() throws IOException {
+    Files.createFile(
+        new File(
+                directory,
+                String.format(Locale.ENGLISH, CompressionRatio.RATIO_FILE_PATH_FORMAT, 10, 50))
+            .toPath());
+
+    Files.createFile(
+        new File(
+                directory,
+                String.format(Locale.ENGLISH, CompressionRatio.RATIO_FILE_PATH_FORMAT, -1000, 100))
+            .toPath());
+
+    compressionRatio.restore();
+
+    // if multiple files exist in the system due to some exceptions, restore the file with the
+    // largest diskSize to the memory
+    assertEquals(0.2, compressionRatio.getRatio(), 0.1);
+  }
+
+  @Test
+  public void testRestoreIllegal2() throws IOException {
+
+    Files.createFile(
+        new File(
+                directory,
+                String.format(Locale.ENGLISH, CompressionRatio.RATIO_FILE_PATH_FORMAT, -1000, 100))
+            .toPath());
+
+    compressionRatio.restore();
+
+    // if compression ratio from file is negative, assume the compression ratio is 0 / 0 = NaN
+    assertEquals(Double.NaN, compressionRatio.getRatio(), 0.1);
+  }
 }