以下的文章主要介绍的是mysql 查询缓存的实际应用代码以及查看MySQL 查询缓存的大小 ,碎片整理,清除缓存以及监视MySQL 查询缓存性能的相关内容的描述,以下就是具体内容的描述,希望在你今后的学习中会有所帮助。
MySQL> select @@query_cache_type;
+--------------------+
| @@query_cache_type |
+--------------------+
| ON |
+--------------------+
MySQL> set query_cache_type=off;
MySQL> set query_cache_type=on;
MySQL>
MySQL> select sql_cache id, title, body from article;
MySQL> select sql_no_cache id, title, body from article;
MySQL> show variables pke 'have_query_cache';
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| have_query_cache | YES |
+------------------+-------+
1 row in set (0.00 sec)
查看MySQL 查询缓存的大小
MySQL> select @@global.query_cache_size;
+---------------------------+
| @@global.query_cache_size |
+---------------------------+
| 16777216 |
+---------------------------+
1 row in set (0.00 sec)
MySQL> select @@query_cache_size;
+--------------------+
| @@query_cache_size |
+--------------------+
| 16777216 |
+--------------------+
1 row in set (0.00 sec)
查看最大缓存结果,如果结果集大于该数,不缓存。
MySQL> select @@global.query_cache_pmit;
+----------------------------+
| @@global.query_cache_pmit |
+----------------------------+
| 1048576 |
+----------------------------+
1 row in set (0.00 sec)
碎片整理
MySQL> flush query cache
-> ;
Query OK, 0 rows affected (0.00 sec)
清除缓存
MySQL> reset query cache
-> ;
Query OK, 0 rows affected (0.00 sec
监视MySQL 查询缓存性能:
MySQL> flush tables;
Query OK, 0 rows affected (0.04 sec)
MySQL> show status pke 'qcache%';
+-------------------------+----------+
| Variable_name | Value |
+-------------------------+----------+
| Qcache_free_blocks | 1 |
| Qcache_free_memory | 16768408 |
| Qcache_hits | 6 |
| Qcache_inserts | 36 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 86 |
| Qcache_queries_in_cache | 0 |
| Qcache_total_blocks | 1 |
+-------------------------+----------+
8 rows in set (0.06 sec)
看看当前缓存中有多少条信息:
MySQL> show status pke 'qcache_q%';
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| Qcache_queries_in_cache | 0 |
+-------------------------+-------+
1 row in set (0.00 sec)
MySQL> select sql_cache id, title, body from article;
MySQL> show status pke 'qcache_q%';
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| Qcache_queries_in_cache | 1 |
+-------------------------+-------+
1 row in set (0.00 sec)
MySQL> show status pke 'qcache_f%';
+--------------------+----------+
| Variable_name | Value |
+--------------------+----------+
| Qcache_free_blocks | 1 |
| Qcache_free_memory | 16766728 |
+--------------------+----------+
2 rows in set (0.00 sec)
以上的相关内容就是对MySQL 查询缓存的介绍,望你能有所收获。
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