我遇到了一个恼人的问题。
我制作了一个系统，现在用户告诉我它正在给他们留言：
内存不足（需要268435427字节）
整个数据库大小为12MB，遇到问题的查询运行了好几个月，并不是那么复杂或大。
数据库是innodb。我的服务器有24GB的RAM，所以我很怀疑它实际上是内存不足。
my.cnf如下：
key_buffer = 8000M
max_allowed_packet = 1M
table_cache = 2048M
sort_buffer_size = 1M
net_buffer_length = 1024M
read_buffer_size = 1M
read_rnd_buffer_size = 24M
innodb_log_file_size = 5M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 50
innodb_buffer_pool_size = 1024M
innodb_additional_mem_pool_size = 2M
max_connections = 100
query_cache_size = 128M
query_cache_min_res_unit = 1024
query_cache_limit = 16MB
thread_cache_size = 100
max_heap_table_size = 4096MB
在Windows任务管理器中查看时，我看到18.8GB可用但只有100MB可用空间。它是Windows 2008 64位服务器，这可能是问题的根源吗？
以下是查询：
$currency = '(SELECT currencies.symbol
FROM parts_trading, currencies
WHERE parts_trading.enquiryRef = enquiries.id
AND parts_trading.sellingCurrency = currencies.id
LIMIT 1
)' ;
$amountDueSQL = '(
(SELECT SUM(quantity*(parts_trading.sellingNet
+
parts_trading.sellingVat))
FROM parts_trading
WHERE parts_trading.enquiryRef = enquiries.id
)
+
(SELECT SUM(enquiries_custom_fees.feeAmountNet
+
enquiries_custom_fees.feeAmountVat)
FROM enquiries_custom_fees
WHERE enquiries_custom_fees.enquiryRef = enquiries.id
)
)' ;
$amountPaidSQL = 'COALESCE(
(SELECT SUM(jobs_payments_advance.amount)
FROM jobs_payments_advance
WHERE jobs_payments_advance.jobRef = jobs.id
),
0
)' ;
$result = $dbh->prepare("SELECT SQL_CALC_FOUND_ROWS jobs.id, jobs_states.state, jobs.creationDate, users.username,
entity_details.name, enquiries.id as enquiryId, pendingCancelation,
IF(entity_details.paymentTermsRef = 1, # Outer IF condition
IF($amountDueSQL-$amountPaidSQL = 0.00, # Inner IF condition
CONCAT('Paid in full (', $currency, $amountDueSQL, ')') # Inner IF TRUE
, # End of inner IF TRUE
IF($amountPaidSQL > 0,
CONCAT('Part paid (', $currency, $amountPaidSQL, ')'),
'Unpaid'
)
) # End of inner IF
, # End of TRUE for outer IF
(SELECT entity_payment_terms.term
FROM entity_details, entity_payment_terms
WHERE entity_details.paymentTermsRef
=
entity_payment_terms.id
AND entity_details.id = enquiries.entityRef
) # End of FALSE for outer IF
) AS payState, enquiries.orderNumber,
IF((SELECT COUNT(*)
FROM invoices_out, (SELECT * FROM invoices_out_reference GROUP BY jobRef) AS tb1
WHERE invoices_out.id = tb1.invoiceRef
AND tb1.jobRef = jobs.id) > 1,
'Part-invoiced',
(SELECT invoices_out.date
FROM invoices_out, (SELECT * FROM invoices_out_reference GROUP BY jobRef) AS tb1
WHERE invoices_out.id = tb1.invoiceRef
AND tb1.jobRef = jobs.id)
) AS invoicedDate,
enquiries.id AS enquiryId,
IF((SELECT COUNT(*)
FROM invoices_out, (SELECT * FROM invoices_out_reference GROUP BY jobRef) AS tb1
WHERE invoices_out.id = tb1.invoiceRef
AND tb1.jobRef = jobs.id) > 1,
'Multiple invoices',
(SELECT invoices_out.id
FROM invoices_out, (SELECT * FROM invoices_out_reference GROUP BY jobRef) AS tb1
WHERE invoices_out.id = tb1.invoiceRef
AND tb1.jobRef = jobs.id)
) AS invoiceNumber,
# If the state is 0 (i.e. they have an account, if true find out their payment terms, if false, instead reference the payment state directly.
(SELECT MAX(etaDate) FROM parts_trading WHERE parts_trading.enquiryRef = enquiries.id) AS maxEtaDate,
(SELECT COUNT(DISTINCT DATE(etaDate)) FROM parts_trading WHERE parts_trading.enquiryRef = enquiries.id) AS etaCounts, entity_credit_limits.creditLimit AS cLimit,
COALESCE((SELECT
SUM(qty*parts_trading_buying.buyingNet
/
(SELECT rateVsPound FROM currencies WHERE currencies.id = parts_trading_buying.buyingCurrency))
FROM parts_trading_buying
WHERE parts_trading_buying.enquiryRef = enquiries.id
), 0
) AS nonInvoicedBuyingCosts,
COALESCE((SELECT
SUM(feeAmountNet/(SELECT rateVsPound FROM currencies WHERE currencies.id = parts_trading_buying.buyingCurrency))
FROM parts_trading_buying_charges, parts_trading_buying
WHERE parts_trading_buying_charges.partRef = parts_trading_buying.id
AND parts_trading_buying.enquiryRef = enquiries.id
), 0
) AS nonInvoicedBuyingFeeCosts,
(SELECT
SUM(quantity*parts_trading.sellingNet)
/
COALESCE(
(SELECT invoices_out.rate
FROM invoices_out, invoices_out_reference
WHERE invoices_out.id = invoices_out_reference.invoiceRef
AND invoices_out_reference.jobRef = jobs.id
LIMIT 1),
(SELECT rateVsPound
FROM currencies
WHERE currencies.id = parts_trading.sellingCurrency)
)
FROM parts_trading
WHERE parts_trading.enquiryRef = enquiries.id
) AS sellingParts,
COALESCE((SELECT
SUM(enquiries_custom_fees.feeAmountNet)
/
COALESCE(
(SELECT rate
FROM invoices_out, invoices_out_reference
WHERE invoices_out.id = invoices_out_reference.invoiceRef
AND invoices_out_reference.jobRef = jobs.id LIMIT 1),
(SELECT rateVsPound
FROM currencies
WHERE currencies.id = parts_trading.sellingCurrency
)
)
FROM enquiries_custom_fees, parts_trading
WHERE enquiries_custom_fees.enquiryRef = enquiries.id
AND parts_trading.enquiryRef = enquiries.id), 0) AS sellingFees,
COALESCE((SELECT
SUM(parts_shipping_out.shippingOutCost)
FROM parts_shipping_out, parts_shipping_arrival_dates, parts_shipping_v2
WHERE parts_shipping_out.arrivalsRef = parts_shipping_arrival_dates.id
AND parts_shipping_arrival_dates.shippingRef = parts_shipping_v2.id
AND parts_shipping_v2.jobRef = jobs.id
), 0
) AS actualShippingOutFromEua,
(SELECT
SUM(quantity*parts_trading.sellingNet)
/
COALESCE(
(SELECT invoices_out.rate
FROM invoices_out, invoices_out_reference
WHERE invoices_out.id = invoices_out_reference.invoiceRef
AND invoices_out_reference.jobRef = jobs.id
LIMIT 1),
(SELECT rateVsPound
FROM currencies
WHERE currencies.id = parts_trading.sellingCurrency)
)
+
COALESCE((SELECT
SUM(enquiries_custom_fees.feeAmountNet)
/
COALESCE(
(SELECT rate
FROM invoices_out, invoices_out_reference
WHERE invoices_out.id = invoices_out_reference.invoiceRef
AND invoices_out_reference.jobRef = jobs.id LIMIT 1),
(SELECT rateVsPound
FROM currencies
WHERE currencies.id = parts_trading.sellingCurrency
)
)
FROM enquiries_custom_fees
WHERE enquiries_custom_fees.enquiryRef = enquiries.id), 0)
-
COALESCE((SELECT
SUM(qty*parts_trading_buying.buyingNet
/
(SELECT rateVsPound FROM currencies WHERE currencies.id = parts_trading_buying.buyingCurrency))
FROM parts_trading_buying
WHERE parts_trading_buying.enquiryRef = enquiries.id
), 0
)
-
COALESCE((SELECT
SUM(feeAmountNet/(SELECT rateVsPound FROM currencies WHERE currencies.id = parts_trading_buying.buyingCurrency))
FROM parts_trading_buying_charges, parts_trading_buying
WHERE parts_trading_buying_charges.partRef = parts_trading_buying.id
AND parts_trading_buying.enquiryRef = enquiries.id
), 0
)
-
COALESCE((SELECT
SUM(parts_shipping_out.shippingOutCost)
FROM parts_shipping_out, parts_shipping_arrival_dates, parts_shipping_v2
WHERE parts_shipping_out.arrivalsRef = parts_shipping_arrival_dates.id
AND parts_shipping_arrival_dates.shippingRef = parts_shipping_v2.id
AND parts_shipping_v2.jobRef = jobs.id
), 0
)
FROM parts_trading, parts_trading_buying
WHERE parts_trading.enquiryRef = enquiries.id
AND parts_trading_buying.counterpartRef = parts_trading.id
) AS margin
FROM jobs,
jobs_states, enquiries, users, jobs_payment_status, entity_details
LEFT JOIN entity_credit_limits ON entity_details.id = entity_credit_limits.entityRef
WHERE jobs.stateRef = jobs_states.id
AND IF(paymentStateRef = 0, 1, (jobs_payment_status.id = jobs.paymentStateRef))
# ^ If true it causes a result for each payment state (i.e. 3), so we group on state below, shouldn't cause probs.
AND jobs.enquiryRef = enquiries.id
AND enquiries.entityRef = entity_details.id
AND users.id = enquiries.traderRef
AND enquiries.traderRef = ?
LIMIT ?, ?") ;
如果我尝试将PHP执行内存设置在3.5GB以上Apache就不会启动（我正在使用xampp）。我必须使用32位版本的PHP？对于INNODB_BUFFER_POOL_SIZE，这是相同的，我希望它是14GB，但如果我这样做，mysql将无法启动。
答案 0 :(得分：1)
我不认为这是一个数据库相关的问题，因为这种错误（内存不足（需要268435427字节））大部分时间由PHP抛出（无限循环或类似的东西可能是问题）。
答案 1 :(得分：0)
现在（两分钟的时间）您可以使用MySQLCalculator.com查看基本的RAM占用空间。 如果配置中的所有连接RAM条目都具有领先优势＃，那么运行正常，实际上要好得多。使用read_rnd_buffer_size = 24M而不是默认值256K，您将读取超过96 X的索引信息。