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bool in_resize; /* true during resize operation */
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bool resize_in_flush; /* true during flush of resize operation */
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bool can_be_used; /* usage of cache for read/write is allowed */
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size_t key_cache_mem_size; /* specified size of the cache memory */
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uint key_cache_block_size; /* size of the page buffer of a cache block */
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uint32_t hash_entries; /* max number of entries in the hash table */
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uint32_t key_cache_mem_size; /* specified size of the cache memory */
69
uint32_t key_cache_block_size; /* size of the page buffer of a cache block */
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int disk_blocks; /* max number of blocks in the cache */
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ulong min_warm_blocks; /* min number of warm blocks; */
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ulong age_threshold; /* age threshold for hot blocks */
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uint64_t keycache_time; /* total number of block link operations */
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uint hash_entries; /* max number of entries in the hash table */
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int hash_links; /* max number of hash links */
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int hash_links_used; /* number of hash links currently used */
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int disk_blocks; /* max number of blocks in the cache */
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ulong blocks_used; /* maximum number of concurrently used blocks */
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ulong blocks_unused; /* number of currently unused blocks */
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ulong blocks_changed; /* number of currently dirty blocks */
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initializing the key cache.
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uint64_t param_buff_size; /* size the memory allocated for the cache */
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ulong param_block_size; /* size of the blocks in the key cache */
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ulong param_division_limit; /* min. percentage of warm blocks */
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ulong param_age_threshold; /* determines when hot block is downgraded */
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uint32_t param_buff_size; /* size the memory allocated for the cache */
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uint32_t param_block_size; /* size of the blocks in the key cache */
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uint32_t param_division_limit; /* min. percentage of warm blocks */
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uint32_t param_age_threshold; /* determines when hot block is downgraded */
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int blocks; /* max number of blocks in the cache */
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/* Statistics variables. These are reset in reset_key_cache_counters(). */
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ulong global_blocks_changed; /* number of currently dirty blocks */
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uint64_t global_cache_w_requests;/* number of write requests (write hits) */
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uint64_t global_cache_r_requests;/* number of read requests (read hits) */
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uint64_t global_cache_read; /* number of reads from files to cache */
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int blocks; /* max number of blocks in the cache */
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bool in_init; /* Set to 1 in MySQL during init/resize */
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/* The default key cache */
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extern KEY_CACHE dflt_key_cache_var, *dflt_key_cache;
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extern int init_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
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size_t use_mem, uint division_limit,
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extern int resize_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
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size_t use_mem, uint division_limit,
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extern void change_key_cache_param(KEY_CACHE *keycache, uint division_limit,
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extern uchar *key_cache_read(KEY_CACHE *keycache,
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File file, my_off_t filepos, int level,
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uchar *buff, uint length,
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uint block_length,int return_buffer);
126
extern int init_key_cache(KEY_CACHE *keycache, uint32_t key_cache_block_size,
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uint32_t use_mem, uint32_t division_limit,
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uint32_t age_threshold);
129
extern int resize_key_cache(KEY_CACHE *keycache, uint32_t key_cache_block_size,
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uint32_t use_mem, uint32_t division_limit,
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uint32_t age_threshold);
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extern unsigned char *key_cache_read(KEY_CACHE *keycache,
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int file, my_off_t filepos, int level,
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unsigned char *buff, uint32_t length,
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uint32_t block_length,int return_buffer);
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extern int key_cache_insert(KEY_CACHE *keycache,
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File file, my_off_t filepos, int level,
138
uchar *buff, uint length);
137
int file, my_off_t filepos, int level,
138
unsigned char *buff, uint32_t length);
139
139
extern int key_cache_write(KEY_CACHE *keycache,
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File file, my_off_t filepos, int level,
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uchar *buff, uint length,
142
uint block_length,int force_write);
140
int file, my_off_t filepos, int level,
141
unsigned char *buff, uint32_t length,
142
uint32_t block_length,int force_write);
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143
extern int flush_key_blocks(KEY_CACHE *keycache,
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int file, enum flush_type type);
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145
extern void end_key_cache(KEY_CACHE *keycache, bool cleanup);
147
/* Functions to handle multiple key caches */
148
extern bool multi_keycache_init(void);
149
extern void multi_keycache_free(void);
150
extern KEY_CACHE *multi_key_cache_search(uchar *key, uint length);
151
extern bool multi_key_cache_set(const uchar *key, uint length,
152
KEY_CACHE *key_cache);
153
extern void multi_key_cache_change(KEY_CACHE *old_data,
154
KEY_CACHE *new_data);
155
extern int reset_key_cache_counters(const char *name,
156
KEY_CACHE *key_cache);
158
#endif /* _keycache_h */
147
extern void reset_key_cache_counters();
153
#endif /* PLUGIN_MYISAM_KEYCACHE_H */