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--- mysql:mysql_basic_queries [2018/04/17 09:11] – dodger
+++ dba:mysql:mysql_basic_queries [2022/02/17 17:57] (current) – [per user] dodger
@@ Line 48: / Line 48: @@
+====== Memory ======
+===== Global summary =====
+<code sql>
+ SELECT current_count_used AS curr_count,
+        sys.format_bytes(current_number_of_bytes_used) curr_alloc,
+        count_alloc,
+        sys.format_bytes(sum_number_of_bytes_alloc) total_alloc,
+        count_free,
+        sys.format_bytes(sum_number_of_bytes_free) total_free
+   FROM performance_schema.memory_summary_global_by_event_name;
+</code>
+===== memory by event =====
+<code sql>
+SELECT EVENT_NAME,
+COUNT_ALLOC,
+COUNT_FREE,
+SUM_NUMBER_OF_BYTES_ALLOC,
+SUM_NUMBER_OF_BYTES_FREE
+FROM performance_schema.memory_summary_global_by_event_name
+where count_alloc>1
+ORDER BY count_alloc
+;
+</code>
+===== per user =====
+<code sql>
+ SELECT IFNULL(user, 'mysqld_background') AS user,
+        current_count_used AS curr_count,
+        sys.format_bytes(current_number_of_bytes_used) curr_alloc,
+        count_alloc,
+        sys.format_bytes(sum_number_of_bytes_alloc) total_alloc,
+        count_free,
+        sys.format_bytes(sum_number_of_bytes_free) total_free
+   FROM performance_schema.memory_summary_by_user_by_event_name
+  where current_number_of_bytes_used>0
+  ORDER BY current_number_of_bytes_used DESC;
+</code>
@@ Line 92: / Line 133: @@
 <code sql>SHOW INDEX FROM tbl_name [FROM db_name]
 </code>
+<code sql>
+SELECT DISTINCT
+    TABLE_NAME,
+    INDEX_NAME
+FROM INFORMATION_SCHEMA.STATISTICS
+WHERE TABLE_SCHEMA = 'your_schema';
+</code>
 ===== DDL/Metadata =====