Importance Of Sqlctr.h File

Hi all-- there is a file in C:Program FilesMicrosoft SQL ServerMSSQLBinn direcetory called sqlctr.h which contains a lot of counter parametres..could any one tell me having its importance and can we change any of parametres to gain performance..
Thanks in advance..

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// Please do not edit.

#defineBUFMGR_OBJECT0
#define BUF_RESERVED_PAGE_COUNT2
#define BUF_CHECKPOINT_WRITES4
#define BUF_AWE_LOOKUP_MAPS6
#define BUF_BLOCK_WRITES8
#define BUF_COMMITTED_PAGE_COUNT10
#define BUF_AWE_UNMAP_CALLS12
#define BUF_TARGET_PAGE_COUNT14
#define BUF_AWE_UNMAP_PAGES16
#define BUF_CACHE_RATIO_BASE18
#define BUF_FREELIST_STALLS20
#define BUF_HASHED_PAGE_COUNT22
#define BUF_LIFE_EXPECTANCY24
#define BUF_CACHE_HIT_RATIO26
#define BUF_AWE_WRITE_MAPS28
#define BUF_PAGE_REQUESTS30
#define BUF_STOLEN_PAGE_COUNT32
#define BUF_BLOCK_READS34
#define BUF_NUM_FREE_BUFFERS36
#define BUF_LAZY_WRITES38
#define BUF_READAHEAD_PAGES40
#define BUF_AWE_STOLEN_MAPS42
#define BUF_PROCCACHE_SIZE44
#defineBUFPART_OBJECT46
#define BUFPART_NUM_FREE_BUFFERS48
#define BUFPART_FREE_BUFFERS_USED50
#define BUFPART_FREE_BUFFERS_EMPTY52
#defineGENERAL_OBJECT54
#define GO_LOGINS56
#define GO_LOGOUTS58
#define GO_USER_CONNECTIONS60
#defineLOCKS_OBJECT62
#define LCK_TOTAL_WAITTIME64
#define LCK_NUM_WAITS66
#define LCK_AVERAGE_WAITTIME_BASE68
#define LCK_NUM_DEADLOCKS70
#define LCK_NUM_TIMEOUTS72
#define LCK_NUM_REQUESTS74
#define LCK_AVERAGE_WAITTIME76
#defineDBMGR_OBJECT78
#define DB_REPLTRANS80
#define DB_DBCC_SCANRATE82
#define DB_REPLCOUNT84
#define DB_LOG_SIZE86
#define DB_LOG_TRUNCS88
#define DB_LOG_USED_PERCENT90
#define DB_LOG_SHRINKS92
#define DB_BULK_KILOBYTES94
#define DB_FLUSH_WAIT_TIME96
#define DB_ACT_XTRAN98
#define DB_LOGCACHE_READS100
#define DB_FLUSH_WAITS102
#define DB_BCK_DB_THROUGHPUT104
#define DB_DBCC_MOVERATE106
#define DB_LOG_GROWTHS108
#define DB_TOTAL_XTRAN110
#define DB_LOGCACHE_BASE112
#define DB_BYTES_FLUSHED114
#define DB_LOG_USED116
#define DB_LOGCACHE_RATIO118
#define DB_DATA_SIZE120
#define DB_BULK_ROWS122
#define DB_FLUSHES124
#defineLATCH_OBJECT126
#define LATCH_TOTAL_WAIT_NP128
#define LATCH_WAITS_NP130
#define LATCH_AVG_WAIT_NP132
#define LATCH_AVG_WAIT_BASE134
#defineACCESS_METHODS_OBJECT136
#define AM_EXTENTS_ALLOCATED138
#define AM_WORKTABLES_CREATED140
#define AM_GHOSTED_SKIPS142
#define AM_FULL_SCAN144
#define AM_PAGES_ALLOCATED146
#define AM_PAGE_SPLITS148
#define AM_SINGLE_PAGE_ALLOCS150
#define AM_EXTENTS_DEALLOCATED152
#define AM_PROBE_SCAN154
#define AM_FREESPACE_PAGES156
#define AM_WORKTABLES_FROM_CACHE_BASE158
#define AM_LOCKESCALATIONS160
#define AM_PAGE_DEALLOCS162
#define AM_WORKTABLES_FROM_CACHE164
#define AM_INDEX_SEARCHES166
#define AM_FREESPACE_SCANS168
#define AM_FORWARDED_RECS170
#define AM_WORKFILES_CREATED172
#define AM_SCAN_REPOSITION174
#define AM_RANGE_SCAN176
#defineSQL_OBJECT178
#define SQL_AUTOPARAM_REQ180
#define SQL_BATCH_REQ182
#define SQL_RECOMPILES184
#define SQL_AUTOPARAM_UNSAFE186
#define SQL_COMPILES188
#define SQL_AUTOPARAM_FAIL190
#define SQL_AUTOPARAM_SAFE192
#defineCACHE_OBJECT194
#define CACHE_USE_COUNT196
#define CACHE_HIT_RATIO_BASE198
#define CACHE_OBJECT_COUNT200
#define CACHE_HIT_RATIO202
#define CACHE_PGS_IN_USE204
#defineMEMORY_OBJECT206
#define MEMORY_MEMGRANT_MAXIMUM208
#define MEMORY_CONNECTION_MEMORY210
#define MEMORY_MEMGRANT_WAITERS212
#define MEMORY_MEMGRANT_OUTSTANDING214
#define MEMORY_SQL_CACHE_MEMORY216
#define MEMORY_OPTIMIZER_MEMORY218
#define MEMORY_LOCKS220
#define MEMORY_SERVER_MEMORY222
#define MEMORY_LOCKOWNERS_ALLOCATED224
#define MEMORY_LOCK_MEMORY226
#define MEMORY_LOCKS_ALLOCATED228
#define MEMORY_SERVER_MEMORY_TARGET230
#define MEMORY_LOCKOWNERS232
#define MEMORY_MEMGRANT_ACQUIRES234
#defineUSER_QUERY_OBJECT236
#define QUERY_INSTANCE238
#defineREPLICATION_AGENT_OBJECT240
#define RUNNING_INSTANCE242
#defineMERGE_AGENT_OBJECT244
#define MERGE_CONFLICTS_INSTANCE246
#define UPLOAD_INSTANCE248
#define DOWNLOAD_INSTANCE250
#defineLOGREADER_AGENT_OBJECT252
#define LOGREADER_LATENCY_INSTANCE254
#define LOGREADER_TRANSACTIONS_INSTANCE256
#define LOGREADER_COMMANDS_INSTANCE258
#defineDISTRIBUTION_AGENT_OBJECT260
#define DISTRIBUTION_TRANS_INSTANCE262
#define DISTRIBUTION_LATENCY_INSTANCE264
#define DISTRIBUTION_COMMANDS_INSTANCE266
#defineSNAPSHOT_AGENT_OBJECT268
#define SNAPSHOT_TRANSACTIONS_BCPED270
#define SNAPSHOT_COMMANDS_BCPED272
#defineBACKUP_DEV_OBJECT274
#define DB_BCK_DEV_THROUGHPUT276