diff --git a/storage/databases/caching.pdf b/storage/databases/caching.pdf
new file mode 100644
index 0000000..6bc1af6
Binary files /dev/null and b/storage/databases/caching.pdf differ
diff --git a/storage/databases/database_overview.pdf b/storage/databases/database_overview.pdf
new file mode 100644
index 0000000..6bc1af6
Binary files /dev/null and b/storage/databases/database_overview.pdf differ