diff options
Diffstat (limited to 'sql/mysql_priv.h')
| -rw-r--r-- | sql/mysql_priv.h | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h index 657ca3274cd..4cee7d04ef0 100644 --- a/sql/mysql_priv.h +++ b/sql/mysql_priv.h @@ -73,22 +73,30 @@ void kill_one_thread(THD *thd, ulong id); #define MAX_FIELDS_BEFORE_HASH 32 #define USER_VARS_HASH_SIZE 16 #define STACK_MIN_SIZE 8192 // Abort if less stack during eval. +#define STACK_BUFF_ALLOC 32 // For stack overrun checks #ifndef MYSQLD_NET_RETRY_COUNT #define MYSQLD_NET_RETRY_COUNT 10 // Abort read after this many int. #endif #define TEMP_POOL_SIZE 128 -/* The following parameters is to decide when to use an extra cache to - optimise seeks when reading a big table in sorted order */ +/* + The following parameters is to decide when to use an extra cache to + optimise seeks when reading a big table in sorted order +*/ #define MIN_FILE_LENGTH_TO_USE_ROW_CACHE (16L*1024*1024) #define MIN_ROWS_TO_USE_TABLE_CACHE 100 -// The following is used to decide if MySQL should use table scanning -// instead of reading with keys. The number says how many evaluation of the -// WHERE clause is comparable to reading one extra row from a table. +/* + The following is used to decide if MySQL should use table scanning + instead of reading with keys. The number says how many evaluation of the + WHERE clause is comparable to reading one extra row from a table. +*/ #define TIME_FOR_COMPARE 5 // 5 compares == one read -// Number of rows in a reference table when refereed through a not unique key. -// This value is only used when we don't know anything about the key -// distribution. + +/* + Number of rows in a reference table when refereed through a not unique key. + This value is only used when we don't know anything about the key + distribution. +*/ #define MATCHING_ROWS_IN_OTHER_TABLE 10 /* Don't pack string keys shorter than this (if PACK_KEYS=1 isn't used) */ |