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如果我提出300,000行從表中（無論是InnoDB的或NDB）成NDB表所示：INSERT INTO ndbtable SELECT FROM表使用荒謬數量的內存在MySQL集羣
INSERT INTO ndbtable2
SELECT a, b,IFNULL(c,UTC_TIMESTAMP()),CASE WHEN b = 'X' THEN e ELSE d END,f
FROM ndbtable1;
Query OK, 308372 rows affected (5 min 12.59 sec)
Records: 308372 Duplicates: 0 Warnings: 0
NDB使用日益龐大關於數據內存直到它完成。 /峯前/後如下
ndb_mgm -e "all report memoryusage"
Connected to Management Server at: fl-prd-mysql1:1186
Node 1: Data usage is 2%(5752 32K pages of total 262144)
Node 1: Index usage is 0%(2428 8K pages of total 262176)
Node 2: Data usage is 2%(5752 32K pages of total 262144)
Node 2: Index usage is 0%(2428 8K pages of total 262176)
Connected to Management Server at: fl-prd-mysql1:1186
Node 1: Data usage is 62%(164013 32K pages of total 262144)
Node 1: Index usage is 1%(3136 8K pages of total 262176)
Node 2: Data usage is 62%(164013 32K pages of total 262144)
Node 2: Index usage is 1%(3136 8K pages of total 262176)
Connected to Management Server at: fl-prd-mysql1:1186
Node 1: Data usage is 3%(10293 32K pages of total 262144)
Node 1: Index usage is 1%(4590 8K pages of total 262176)
Node 2: Data usage is 3%(10293 32K pages of total 262144)
Node 2: Index usage is 1%(4590 8K pages of total 262176)
如果我的數學是正確的我插入10293 - 5752 = 4541 = 142 MB但內存峯值的164013 - 5752 = 158261 = 4945 MB
而且如果我將插入限制爲50,000行，差異前後只有3MB，則峯值爲780MB。
顯然，這將是問題，當ndb不是空的......這裏發生了什麼？！