diff --git a/src/query/storages/fuse/fuse/src/operations/mutation/compact/compact_transform.rs b/src/query/storages/fuse/fuse/src/operations/mutation/compact/compact_transform.rs
index 1307805924a41..d0d459cedc3c8 100644
--- a/src/query/storages/fuse/fuse/src/operations/mutation/compact/compact_transform.rs
+++ b/src/query/storages/fuse/fuse/src/operations/mutation/compact/compact_transform.rs
@@ -37,6 +37,7 @@ use opendal::Operator;
 use super::compact_meta::CompactSourceMeta;
 use super::compact_part::CompactTask;
 use super::CompactSinkMeta;
+use crate::io::write_data;
 use crate::io::BlockReader;
 use crate::io::TableMetaLocationGenerator;
 use crate::operations::mutation::AbortOperation;
@@ -111,7 +112,7 @@ impl CompactTransform {
         thresholds: BlockCompactThresholds,
     ) -> Result<ProcessorPtr> {
         let settings = ctx.get_settings();
-        let max_memory_usage = settings.get_max_memory_usage()?;
+        let max_memory_usage = (settings.get_max_memory_usage()? as f64 * 0.95) as u64;
         let max_threads = settings.get_max_threads()?;
         let max_memory = max_memory_usage / max_threads;
         Ok(ProcessorPtr::create(Box::new(CompactTransform {
@@ -361,13 +362,9 @@ impl Processor for CompactTransform {
                 while let Some(state) = serialize_states.pop() {
                     handles.push(async move {
                         // write block data.
-                        dal.object(&state.block_location)
-                            .write(state.block_data)
-                            .await?;
+                        write_data(&state.block_data, dal, &state.block_location).await?;
                         // write index data.
-                        dal.object(&state.index_location)
-                            .write(state.index_data)
-                            .await
+                        write_data(&state.index_data, dal, &state.index_location).await
                     });
                 }
                 futures::future::try_join_all(handles).await?;