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package main
import (
"os"
"github.com/boltdb/bolt"
)
// Keys retrieves a list of keys for a given bucket.
func Stats(path, name string) {
if _, err := os.Stat(path); os.IsNotExist(err) {
fatal(err)
return
}
db, err := bolt.Open(path, 0600)
if err != nil {
fatal(err)
return
}
defer db.Close()
err = db.View(func(tx *bolt.Tx) error {
// Find bucket.
b := tx.Bucket([]byte(name))
if b == nil {
fatalf("bucket not found: %s", name)
return nil
}
// Iterate over each key.
s := b.Stats()
println("Page count statistics")
printf("\tNumber of logical branch pages: %d\n", s.BranchPageN)
printf("\tNumber of physical branch overflow pages: %d\n", s.BranchOverflowN)
printf("\tNumber of logical leaf pages: %d\n", s.LeafPageN)
printf("\tNumber of physical leaf overflow pages: %d\n", s.LeafOverflowN)
println("Tree statistics")
printf("\tNumber of keys/value pairs: %d\n", s.KeyN)
printf("\tNumber of levels in B+tree: %d\n", s.Depth)
println("Page size utilization")
printf("\tBytes allocated for physical branch pages: %d\n", s.BranchAlloc)
printf("\tBytes actually used for branch data: %d\n", s.BranchInuse)
printf("\tBytes allocated for physical leaf pages: %d\n", s.LeafAlloc)
printf("\tBytes actually used for leaf data: %d\n", s.LeafInuse)
return nil
})
if err != nil {
fatal(err)
return
}
}
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