optimizer trace 文件中的名词缩写

CBQT 					costbased query transformation
JPPD 					join predicate pushdown
OJPPD 					oldstyle (noncostbased) JPPD
FPD 					filter pushdown
PM 					predicate movearound
CVM 					complex view merging
SPJ 					selectprojectjoin
SJC 					set join conversion
SU 					subquery unnesting
OBYE 					order by elimination
OST 					old style star transformation
ST 					new (cbqt) star transformation
CNT 					count(col) to count(*) transformation
JE 					Join Elimination
JF 					join factorization
SLP 					select list pruning
DP 					distinct placement
qb 				        query block
LB 					leaf blocks
DK 					distinct keys
LB/K 					average number of leaf blocks per key
DB/K 					average number of data blocks per key
CLUF 					clustering factor
NDV 					number of distinct values
Resp 					response cost
Card 					cardinality
Resc 					resource cost
NL 					nested loops (join)
SM 					sort merge (join)
HA 					hash (join)
CPUSPEED 				CPU Speed 
IOTFRSPEED 			        I/O transfer speed
IOSEEKTIM 				I/O seek time
SREADTIM 				average single block read time
MREADTIM 				average multiblock read time
MBRC 					average multiblock read count
MAXTHR 				        maximum I/O system throughput
SLAVETHR 				average slave I/O throughput
dmeth 					distribution method
							1: no partitioning required
							2: value partitioned
							4: right is random (roundrobin)
							128: left is random (roundrobin)
							8: broadcast right and partition left
							16: broadcast left and partition right
							32: partition left using partitioning of right
							64: partition right using partitioning of left
							256: run the join in serial
							0: invalid distribution method
sel 					selectivity
ptn 					partition

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