common

const (
	// invalid page id
	InvalidPageID = -1
	// invalid transaction id
	InvalidTxnID = -1
	// invalid log sequence number
	InvalidLSN = -1
	// the header page id
	HeaderPageID = 0
	// size of a data page in byte
	PageSize                     = 4096 //4096 //1024  //512
	BufferPoolMaxFrameNumForTest = 32
	// number for calculate log buffer size (number of page size)
	LogBufferSizeBase = 128
	// size of a log buffer in byte
	LogBufferSize = (LogBufferSizeBase + 1) * PageSize
	// size of hash bucket
	BucketSizeOfHashIndex = 10
	// probability used for determin node level on SkipList
	SkipListProb         = 0.5                          //0.25
	ActiveLogKindSetting = INFO | NotAborableTxnFeature //| CommitAbortHandleInfo | NotAborableTxnFeature | DEBUGGING | RDBOpFuncCall // | DebugInfo  //| BufferInternalState //| DEBUGGING | DebugInfo //| PinCountAssert //DebugInfoDetail  //DEBUGGING
	KernelThreadNum      = 24
	MaxTxnThreadNum      = KernelThreadNum * 1
)

const (
	DebugInfoDetail       LogLevel = 1
	DebugInfo                      = 2
	CacheOutInInfo                 = 2 << 1
	RDBOpFuncCall                  = 2 << 2 // print several info at core functions (ex: CRUD at TableHeap and SkipList/SkipListBlockPage)
	BufferInternalState            = 2 << 3 // print internal state of buffer of BufferPoolManager
	PinCountAssert                 = 2 << 4
	CommitAbortHandleInfo          = 2 << 5
	NotAborableTxnFeature          = 2 << 6
	DEBUGGING                      = 2 << 7 // print debug info for a debugging period (not permanently used)
	INFO                           = 2 << 8
	WARN                           = 2 << 9
	ERROR                          = 2 << 10
	FATAL                          = 2 << 11
)

const EnableDebug bool = false //true

const EnableOnMemStorage = true

const (
	MaxReaders = math.MaxUint32
)