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PHP when querying MySQL, reported out of memory error (select COUNT (DISTINCT))

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Author: User
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Hours server queries the number of coaches, use the Select COUNT (Distinct (U_strno)) times to exceed memory errors. After reference "Mysqld-nt:out of memory Solution" http://jingyan.baidu.com/article/020278116b428d1bcd9ce568.html?qq-pf-to=pcqq.c2c

Modify Parameters:

Key_buffer = 512K #global buffer = Key_buffer = 200M #global buffer

Key_buffer_size = 3096M =>key_buffer_size = 512M

Core tip: Check mysqld configuration my.conf, focus on Key_buffer_size, Max_heap_table_size, tmp_table_size several parameters,

The recommended setting key_buffer_size value is 1/4 of max_heap_table_size.

After modifying the two parameters, restart Apache to resolve the problem.

PHP when querying MySQL, reported out of memory error (select COUNT (DISTINCT))

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Related Keywords:
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