gstat: Print detailed blob statistics and table size (#8394)

* Print detailed blob statistics and table size

The new blob statistics looks as follow:

```
...
Empty pages: 0, full pages: 0
Blobs: 9, total length: 1451015, blob pages: 182
    Level 0: 3, total length: 15, blob pages: 0
    Level 1: 6, total length: 1451000, blob pages: 182
Table size: 1515520 bytes
Fill distribution:
...
```

* Add new message instead of modifying existing one

---------

Co-authored-by: Artyom Abakumov <[email protected]>

Author: 2 people

src/include/firebird/impl/msg/gstat.h

@@ -60,3 +60,5 @@ FB_IMPL_MSG_NO_SYMBOL(GSTAT, 59, "Gstat execution time @1")
 FB_IMPL_MSG_NO_SYMBOL(GSTAT, 60, "Gstat completion time @1")
 FB_IMPL_MSG_NO_SYMBOL(GSTAT, 61, "    Expected page inventory page @1")
 FB_IMPL_MSG_NO_SYMBOL(GSTAT, 62, "Generator pages: total @1, encrypted @2, non-crypted @3")
+FB_IMPL_MSG_NO_SYMBOL(GSTAT, 63, "    Table size: @1 bytes")
+FB_IMPL_MSG_NO_SYMBOL(GSTAT, 64, "        Level @1: @2, total length: @3, blob pages: @4")

src/utilities/gstat/dba.epp

@@ -123,6 +123,22 @@ struct dba_fmt
 	bool fmt_used;
 };
 
+inline constexpr ULONG MAX_BLOB_LEVELS = 3;
+struct dba_blob_statistics
+{
+	FB_UINT64 blob_count = 0;
+	FB_UINT64 blob_space = 0;
+	FB_UINT64 blob_pages = 0;
+
+	dba_blob_statistics& operator+=(const dba_blob_statistics& rhs)
+	{
+		blob_count += rhs.blob_count;
+		blob_space += rhs.blob_space;
+		blob_pages += rhs.blob_pages;
+		return *this;
+	}
+};
+
 struct dba_rel
 {
 	dba_rel* rel_next;
@@ -147,10 +163,7 @@ struct dba_rel
 	FB_UINT64 rel_fragments;
 	FB_UINT64 rel_fragment_space;
 	FB_UINT64 rel_max_fragments;
-	FB_UINT64 rel_blobs_level_0;
-	FB_UINT64 rel_blobs_level_1;
-	FB_UINT64 rel_blobs_level_2;
-	FB_UINT64 rel_blob_space;
+	dba_blob_statistics rel_blob_statistics[MAX_BLOB_LEVELS];
 	ULONG rel_fill_distribution[BUCKETS];
 	FB_UINT64 rel_format_space;
 	FB_UINT64 rel_total_space;
@@ -1082,16 +1095,46 @@ int gstat(Firebird::UtilSvc* uSvc)
 				// msg 47: "    Big record pages: @1
 			}
 
-			if (relation->rel_blobs_level_0 || relation->rel_blobs_level_1 || relation->rel_blobs_level_2)
+			// Blobs are analyzing only when the record option is set
+			if (sw_record)
 			{
-				dba_print(false, 48, SafeArg() << (relation->rel_blobs_level_0 + relation->rel_blobs_level_1 +
-												  relation->rel_blobs_level_2) << relation->rel_blob_space <<
-												  relation->rel_blob_pages);
-				// msg 48: "    Blobs: @1, total length: @2, blob pages: @3
-
-				dba_print(false, 49, SafeArg() << relation->rel_blobs_level_0 << relation->rel_blobs_level_1 <<
-												 relation->rel_blobs_level_2);
-				// msg 49: "		Level 0: @1, Level 1: @2, Level 2: @3
+				dba_blob_statistics blobsTotal;
+				for (ULONG i = 0; i < MAX_BLOB_LEVELS; ++i)
+				{
+					blobsTotal += relation->rel_blob_statistics[i];
+				}
+
+				if (blobsTotal.blob_count)
+				{
+					dba_print(false, 48, SafeArg()
+						<< blobsTotal.blob_count
+						<< blobsTotal.blob_space
+						<< blobsTotal.blob_pages);
+					// msg 48: "    Blobs: @1, total length: @2, blob pages: @3
+
+					for (ULONG i = 0; i < MAX_BLOB_LEVELS; ++i)
+					{
+						const dba_blob_statistics& blob_level = relation->rel_blob_statistics[i];
+
+						if (blob_level.blob_count > 0)
+						{
+							dba_print(false, 49, SafeArg()
+								<< i
+								<< blob_level.blob_count
+								<< blob_level.blob_space
+								<< blob_level.blob_pages);
+							// msg 64: "        Level @1: @2, total length: @3, blob pages: @4
+						}
+					}
+				}
+
+
+				const FB_SIZE_T tableSize = tddba->page_size * (
+					relation->rel_pointer_pages +
+					relation->rel_data_pages +
+					blobsTotal.blob_pages);
+
+				dba_print(false, 63, SafeArg() << tableSize); // msg 63: "Table size: @1 bytes
 			}
 
 			dba_print(false, 13);	// msg 13: "    Fill distribution:"
@@ -1470,32 +1513,31 @@ static bool analyze_data_page( dba_rel* relation, const data_page* page, bool sw
 
 static void analyze_blob(dba_rel* relation, const blh* blob, int length)
 {
-	relation->rel_blob_space += blob->blh_length;
-	if (!blob->blh_level)
-	{
-		relation->rel_blobs_level_0++;
-	}
-	else
+	fb_assert(blob->blh_level < MAX_BLOB_LEVELS);
+	dba_blob_statistics& blob_level = relation->rel_blob_statistics[blob->blh_level];
+
+	++blob_level.blob_count;
+	blob_level.blob_space += blob->blh_length;
+
+	if (blob->blh_level != 0)
 	{
 		const int slots = (length - BLH_SIZE) / static_cast<int>(sizeof(SLONG));
-		relation->rel_blob_pages += slots;
-		if (blob->blh_level == 1)
-		{
-			relation->rel_blobs_level_1++;
-		}
-		else
-		{
-			relation->rel_blobs_level_2++;
+		ULONG blobPages = slots;
 
+		if (blob->blh_level == 2)
+		{
 			SLONG pages[MAX_PAGE_SIZE / sizeof(SLONG)];
 			memcpy(pages, blob->blh_page, slots * sizeof(SLONG));
 
 			for (int i = 0; i < slots; i++)
 			{
 				const blob_page* bpage = (const blob_page*) db_read(pages[i]);
-				relation->rel_blob_pages += bpage->blp_length / sizeof(SLONG);
+				blobPages += bpage->blp_length / sizeof(SLONG);
 			}
 		}
+
+		relation->rel_blob_pages += blobPages;
+		blob_level.blob_pages += blobPages;
 	}
 }