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|
ovfl_pages int, -- Number of overflow pages used
int_unused int, -- Number of unused bytes on interior pages
leaf_unused int, -- Number of unused bytes on primary pages
ovfl_unused int -- Number of unused bytes on overflow pages
);}
mem eval $tabledef
# This query will be used to find the root page number for every table
# Quote a string for use in an SQL query. Examples:
# in the database.
#
set sql {
SELECT name, rootpage
FROM sqlite_master WHERE type='table'
UNION ALL
SELECT 'sqlite_master', 1
ORDER BY 1
}
# Quote a string for SQL
# [quote {hello world}] == {'hello world'}
# [quote {hello world's}] == {'hello world''s'}
#
proc quote txt {
proc quote {txt} {
regsub -all ' $txt '' q
return '$q'
}
# This proc is a wrapper around the btree_cursor_info command. The
# second argument is an open btree cursor returned by [btree_cursor].
# The first argument is the name of an array variable that exists in
# the scope of the caller. If the third argument is non-zero, then
# info is returned for the page that lies $up entries upwards in the
# tree-structure. (i.e. $up==1 returns the parent page, $up==2 the
# grandparent etc.)
#
# The following entries in that array are filled in with information retrieved
# using [btree_cursor_info]:
#
# $arrayvar(page_no) = The page number
# $arrayvar(entry_no) = The entry number
# $arrayvar(page_entries) = Total number of entries on this page
# $arrayvar(cell_size) = Cell size (local payload + header)
# $arrayvar(page_freebytes) = Number of free bytes on this page
# $arrayvar(page_freeblocks) = Number of free blocks on the page
# $arrayvar(payload_bytes) = Total payload size (local + overflow)
# $arrayvar(header_bytes) = Header size in bytes
# $arrayvar(local_payload_bytes) = Local payload size
# $arrayvar(parent) = Parent page number
#
proc cursor_info {arrayvar csr {up 0}} {
upvar $arrayvar a
foreach [list a(page_no) \
a(entry_no) \
a(page_entries) \
a(cell_size) \
a(page_freebytes) \
a(page_freeblocks) \
a(payload_bytes) \
a(header_bytes) \
a(local_payload_bytes) \
a(parent) ] [btree_cursor_info $csr $up] {}
}
# Analyze every table in the database, one at a time.
# Determine the page-size of the database. This global variable is used
# throughout the script.
#
set pageSize [db eval {PRAGMA page_size}]
# Analyze every table in the database, one at a time.
#
# The following query returns the name and root-page of each table in the
# database, including the sqlite_master table.
#
set sql {
SELECT name, rootpage FROM sqlite_master WHERE type='table'
UNION ALL
SELECT 'sqlite_master', 1
ORDER BY 1
}
foreach {name rootpage} [db eval $sql] {
puts stderr "Analyzing table $name..."
set cursor [btree_cursor $DB $rootpage 0]
set go [btree_first $cursor]
# Code below traverses the table being analyzed (table name $name), using the
# btree cursor $cursor. Statistics related to table $name are accumulated in
catch {unset seen}
# the following variables:
#
set total_payload 0 ;# Payload space used by all entries
set total_ovfl 0 ;# Payload space on overflow pages
set unused_int 0 ;# Unused space on interior nodes
set unused_leaf 0 ;# Unused space on leaf nodes
set unused_ovfl 0 ;# Unused space on overflow pages
set cnt_ovfl 0 ;# Number of entries that use overflows
set cnt_leaf_entry 0 ;# Number of leaf entries
set cnt_int_entry 0 ;# Number of interor entries
set mx_payload 0 ;# Maximum payload size
set ovfl_pages 0 ;# Number of overflow pages used
set leaf_pages 0 ;# Number of leaf pages
set int_pages 0 ;# Number of interior pages
while {$go==0} {
# As the btree is traversed, the array variable $seen($pgno) is set to 1
# the first time page $pgno is encountered.
#
catch {unset seen}
# The following loop runs once for each entry in table $name. The table
# is traversed using the btree cursor stored in variable $csr
#
set csr [btree_cursor $DB $rootpage 0]
for {btree_first $csr} {![btree_eof $csr]} {btree_next $csr} {
incr cnt_leaf_entry
# Retrieve information about the entry the btree-cursor points to into
# the array variable $ci (cursor info).
#
set stat [btree_cursor_info $cursor]
set payload [lindex $stat 6]
if {$payload>$mx_payload} {set mx_payload $payload}
incr total_payload $payload
set local [lindex $stat 8]
set ovfl [expr {$payload-$local}]
cursor_info ci $csr
# Check if the payload of this entry is greater than the current
# $mx_payload statistic for the table. Also increase the $total_payload
# statistic.
#
if {$ci(payload_bytes)>$mx_payload} {set mx_payload $ci(payload_bytes)}
incr total_payload $ci(payload_bytes)
# If this entry uses overflow pages, then update the $cnt_ovfl,
# $total_ovfl, $ovfl_pages and $unused_ovfl statistics.
#
set ovfl [expr {$ci(payload_bytes)-$ci(local_payload_bytes)}]
if {$ovfl} {
incr cnt_ovfl
incr total_ovfl $ovfl
set n [expr {int(ceil($ovfl/($pageSize-4.0)))}]
incr ovfl_pages $n
incr unused_ovfl [expr {$n*($pageSize-4) - $ovfl}]
}
set pgno [lindex $stat 0]
if {![info exists seen($pgno)]} {
set seen($pgno) 1
# If this is the first table entry analyzed for the page, then update
# the page-related statistics $leaf_pages and $unused_leaf. Also, if
# this page has a parent page that has not been analyzed, retrieve
# info for the parent and update statistics for it too.
#
if {![info exists seen($ci(page_no))]} {
set seen($ci(page_no)) 1
incr leaf_pages
incr unused_leaf [lindex $stat 4]
set parent [lindex $stat 9]
set up 0
while {$parent!=0 && ![info exists seen($parent)]} {
incr up
set stat [btree_cursor_info $cursor $up]
incr unused_leaf $ci(page_freebytes)
# Now check if the page has a parent that has not been analyzed. If
# so, update the $int_pages, $cnt_int_entry and $unused_int statistics
# accordingly. Then check if the parent page has a parent that has
# not yet been analyzed etc.
#
# set parent $ci(parent_page_no)
for {set up 1} \
{$ci(parent)!=0 && ![info exists seen($ci(parent))]} {incr up} \
{
# Mark the parent as seen.
#
set seen($ci(parent)) 1
# Retrieve info for the parent and update statistics.
cursor_info ci $csr $up
set seen($parent) 1
incr int_pages
incr cnt_int_entry [lindex $stat 2]
incr unused_int [lindex $stat 4]
incr cnt_int_entry $ci(page_entries)
incr unused_int $ci(page_freebytes)
set parent [lindex $stat 9]
}
}
set go [btree_next $cursor]
}
btree_close_cursor $cursor
btree_close_cursor $csr
# Handle the special case where a table contains no data. In this case
# all statistics are zero, except for the number of leaf pages (1) and
# the unused bytes on leaf pages ($pageSize - 8).
#
# An exception to the above is the sqlite_master table. If it is empty
# then all statistics are zero except for the number of leaf pages (1),
# and the number of unused bytes on leaf pages ($pageSize - 112).
#
if {[llength [array names seen]]==0} {
set leaf_pages 1
if {$rootpage==1} {
set unused_leaf [expr {$pageSize-8}]
} elseif {$rootpage==1 && ![info exists seen(1)]} {
set unused_leaf [expr {$pageSize-112}]
} else {
incr int_pages
incr unused_int [expr {$pageSize-112}]
}
set unused_leaf [expr {$pageSize-8}]
}
}
# Insert the statistics for the table analyzed into the in-memory database.
#
set sql "INSERT INTO space_used VALUES("
append sql [quote $name]
append sql ",[quote $name]"
append sql ",0"
append sql ",[expr {$cnt_leaf_entry+$cnt_int_entry}]"
append sql ",$cnt_leaf_entry"
append sql ",$total_payload"
append sql ",$total_ovfl"
append sql ",$cnt_ovfl"
append sql ",$mx_payload"
append sql ",$int_pages"
append sql ",$leaf_pages"
append sql ",$ovfl_pages"
append sql ",$unused_int"
append sql ",$unused_leaf"
append sql ",$unused_ovfl"
append sql );
mem eval $sql
}
# This query will be used to find the root page number for every index
# in the database.
# Analyze every index in the database, one at a time.
#
# The query below returns the name, associated table and root-page number
# for every index in the database.
#
set sql {
SELECT name, tbl_name, rootpage
SELECT name, tbl_name, rootpage FROM sqlite_master WHERE type='index'
FROM sqlite_master WHERE type='index'
ORDER BY 2, 1
}
# Analyze every index in the database, one at a time.
#
set pageSize [db eval {PRAGMA page_size}]
foreach {name tbl_name rootpage} [db eval $sql] {
puts stderr "Analyzing index $name of table $tbl_name..."
set cursor [btree_cursor $DB $rootpage 0]
set go [btree_first $cursor]
# Code below traverses the index being analyzed (index name $name), using the
# btree cursor $cursor. Statistics related to index $name are accumulated in
catch {unset seen}
# the following variables:
#
set total_payload 0 ;# Payload space used by all entries
set total_ovfl 0 ;# Payload space on overflow pages
set unused_leaf 0 ;# Unused space on leaf nodes
set unused_ovfl 0 ;# Unused space on overflow pages
set cnt_ovfl 0 ;# Number of entries that use overflows
set cnt_leaf_entry 0 ;# Number of leaf entries
set mx_payload 0 ;# Maximum payload size
set ovfl_pages 0 ;# Number of overflow pages used
set leaf_pages 0 ;# Number of leaf pages
while {$go==0} {
# As the btree is traversed, the array variable $seen($pgno) is set to 1
# the first time page $pgno is encountered.
#
catch {unset seen}
# The following loop runs once for each entry in index $name. The index
# is traversed using the btree cursor stored in variable $csr
#
set csr [btree_cursor $DB $rootpage 0]
for {btree_first $csr} {![btree_eof $csr]} {btree_next $csr} {
incr cnt_leaf_entry
# Retrieve information about the entry the btree-cursor points to into
# the array variable $ci (cursor info).
#
set stat [btree_cursor_info $cursor]
set payload [btree_keysize $cursor]
cursor_info ci $csr
# Check if the payload of this entry is greater than the current
# $mx_payload statistic for the table. Also increase the $total_payload
# statistic.
#
set payload [btree_keysize $csr]
if {$payload>$mx_payload} {set mx_payload $payload}
incr total_payload $payload
set local [lindex $stat 8]
set ovfl [expr {$payload-$local}]
# If this entry uses overflow pages, then update the $cnt_ovfl,
# $total_ovfl, $ovfl_pages and $unused_ovfl statistics.
#
set ovfl [expr {$payload-$ci(local_payload_bytes)}]
if {$ovfl} {
incr cnt_ovfl
incr total_ovfl $ovfl
set n [expr {int(ceil($ovfl/($pageSize-4.0)))}]
incr ovfl_pages $n
incr unused_ovfl [expr {$n*($pageSize-4) - $ovfl}]
}
set pgno [lindex $stat 0]
if {![info exists seen($pgno)]} {
set seen($pgno) 1
# If this is the first table entry analyzed for the page, then update
# the page-related statistics $leaf_pages and $unused_leaf.
#
if {![info exists seen($ci(page_no))]} {
set seen($ci(page_no)) 1
incr leaf_pages
incr unused_leaf [lindex $stat 4]
incr unused_leaf $ci(page_freebytes)
}
set go [btree_next $cursor]
}
btree_close_cursor $cursor
btree_close_cursor $csr
# Handle the special case where a index contains no data. In this case
# all statistics are zero, except for the number of leaf pages (1) and
# the unused bytes on leaf pages ($pageSize - 8).
#
if {[llength [array names seen]]==0} {
set leaf_pages 1
set unused_leaf [expr {$pageSize-8}]
}
# Insert the statistics for the index analyzed into the in-memory database.
#
set sql "INSERT INTO space_used VALUES("
append sql [quote $name]
append sql ",[quote $tbl_name]"
append sql ",1"
append sql ",$cnt_leaf_entry"
append sql ",$cnt_leaf_entry"
append sql ",$total_payload"
|
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}
}
# Generate a subreport that covers some subset of the database.
# the $where clause determines which subset to analyze.
#
proc subreport {title where} {
global pageSize
set hit 0
global pageSize file_pgcnt
# Query the in-memory database for the sum of various statistics
# for the subset of tables/indices identified by the WHERE clause in
# $where. Note that even if the WHERE clause matches no rows, the
# following query returns exactly one row (because it is an aggregate).
#
# The results of the query are stored directly by SQLite into local
# variables (i.e. $nentry, $nleaf etc.).
#
mem eval "
SELECT
sum(nentry) AS nentry,
sum(leaf_entries) AS nleaf,
sum(payload) AS payload,
sum(ovfl_payload) AS ovfl_payload,
max(mx_payload) AS mx_payload,
sum(ovfl_cnt) as ovfl_cnt,
sum(leaf_pages) AS leaf_pages,
sum(int_pages) AS int_pages,
sum(ovfl_pages) AS ovfl_pages,
sum(leaf_unused) AS leaf_unused,
sum(int_unused) AS int_unused,
sum(ovfl_unused) AS ovfl_unused
FROM space_used WHERE $where" {} {set hit 1}
if {!$hit} {return 0}
FROM space_used WHERE $where" {} {}
# Output the sub-report title, nicely decorated with * characters.
#
puts ""
set len [string length $title]
incr len 5
set stars "***********************************"
append stars $stars
set stars [string range $stars $len end]
set stars [string repeat * [expr 65-$len]]
puts "*** $title $stars"
puts ""
# Calculate statistics and store the results in TCL variables, as follows:
#
# total_pages: Database pages consumed.
# total_pages_percent: Pages consumed as a percentage of the file.
# storage: Bytes consumed.
# payload_percent: Payload bytes used as a percentage of $storage.
# total_unused: Unused bytes on pages.
# avg_payload: Average payload per btree entry.
# avg_fanout: Average fanout for internal pages.
# avg_unused: Average unused bytes per btree entry.
# ovfl_cnt_percent: Percentage of btree entries that use overflow pages.
#
set total_pages [expr {$leaf_pages+$int_pages+$ovfl_pages}]
statline "Percentage of total database" [percent $total_pages $::file_pgcnt]
set total_pages_percent [percent $total_pages $file_pgcnt]
statline "Number of entries" $nleaf
set total_unused [expr {$ovfl_unused+$int_unused+$leaf_unused}]
set storage [expr {$total_pages*$pageSize}]
statline "Bytes of storage consumed" $storage
statline "Bytes of payload" $payload \
[percent $payload $storage {of storage consumed}]
statline "Average payload per entry" [expr {$nleaf>0?$payload/$nleaf:0}]
set avgunused [expr {$nleaf>0?$total_unused/$nleaf:0}]
set payload_percent [percent $payload $storage {of storage consumed}]
set total_unused [expr {$ovfl_unused+$int_unused+$leaf_unused}]
set avg_payload [expr {$nleaf>0?$payload/$nleaf:0}]
set avg_unused [expr {$nleaf>0?$total_unused/$nleaf:0}]
statline "Average unused bytes per entry" $avgunused
set nint [expr {$nentry-$nleaf}]
if {$int_pages>0} {
# TODO: Is this formula correct?
set avg_fanout [format %.2f [expr double($nentry-$nleaf)/$int_pages]]
}
set ovfl_cnt_percent [percent $ovfl_cnt $nleaf {of all entries}]
statline "Average fanout" [format %.2f [expr {($nint+0.0)/$int_pages}]]
# Print out the sub-report statistics.
#
statline {Percentage of total database} $total_pages_percent
statline {Number of entries} $nleaf
statline {Bytes of storage consumed} $storage
statline {Bytes of payload} $payload $payload_percent
statline {Average payload per entry} $avg_payload
statline {Average unused bytes per entry} $avg_unused
if {[info exists avg_fanout]} {
statline {Average fanout} $avg_fanout
}
statline "Maximum payload per entry" $mx_payload
statline "Entries that use overflow" $ovfl_cnt \
statline {Maximum payload per entry} $mx_payload
statline {Entries that use overflow} $ovfl_cnt $ovfl_cnt_percent
[percent $ovfl_cnt $nleaf {of all entries}]
if {$int_pages>0} {
statline "Index pages used" $int_pages
statline {Index pages used} $int_pages
}
statline "Primary pages used" $leaf_pages
statline "Overflow pages used" $ovfl_pages
statline "Total pages used" $total_pages
statline {Primary pages used} $leaf_pages
statline {Overflow pages used} $ovfl_pages
statline {Total pages used} $total_pages
if {$int_unused>0} {
statline "Unused bytes on index pages" $int_unused \
set int_unused_percent \
[percent $int_unused [expr {$int_pages*$pageSize}] {of index space}]
statline "Unused bytes on index pages" $int_unused $int_unused_percent
}
statline "Unused bytes on primary pages" $leaf_unused \
[percent $leaf_unused [expr {$leaf_pages*$pageSize}] {of primary space}]
statline "Unused bytes on overflow pages" $ovfl_unused \
[percent $ovfl_unused [expr {$ovfl_pages*$pageSize}] {of overflow space}]
statline "Unused bytes on all pages" $total_unused \
[percent $total_unused $storage {of all space}]
return 1
}
# Calculate the overhead in pages caused by auto-vacuum.
#
# This procedure calculates and returns the number of pages used by the
# auto-vacuum 'pointer-map'. If the database does not support auto-vacuum,
# then 0 is returned. The two arguments are the size of the database file in
# bytes and the page size used by the database (also in bytes).
# pages and the page size used by the database (in bytes).
proc autovacuum_overhead {filePages pageSize} {
# Read the value of meta 4. If non-zero, then the database supports
# auto-vacuum. It would be possible to use "PRAGMA auto_vacuum" instead,
# but that would not work if the SQLITE_OMIT_PRAGMA macro was defined
# when the library was built.
set meta4 [lindex [btree_get_meta $::DB] 4]
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# is the second page of the file overall.
set ptrsPerPage [expr double($pageSize/5)]
# Return the number of pointer map pages in the database.
return [expr int(ceil( ($filePages-1.0)/($ptrsPerPage+1.0) ))]
}
# Output summary statistics:
#
puts "/** Disk-Space Utilization Report For $file_to_analyze"
puts "*** As of [clock format [clock seconds] -format {%Y-%b-%d %H:%M:%S}]"
puts ""
# Variables:
# Calculate the summary statistics for the database and store the results
# in TCL variables. They are output below. Variables are as follows:
#
# pageSize: Size of each page in bytes.
# file_bytes: File size in bytes.
# file_pgcnt: Number of pages in the file.
# file_pgcnt2: Number of pages in the file (calculated).
# av_pgcnt: Pages consumed by the auto-vacuum pointer-map.
# av_percent: Percentage of the file consumed by auto-vacuum pointer-map.
# inuse_pgcnt: Data pages in the file.
# inuse_percent: Percentage of pages used to store data.
# free_pgcnt: Free pages calculated as (<total pages> - <in-use pages>)
# free_pgcnt2: Free pages in the file according to the file header.
# free_percent: Percentage of file consumed by free pages (calculated).
# free_percent2: Percentage of file consumed by free pages (header).
# ntable: Number of tables in the db.
# nindex: Number of indices in the db.
# nautoindex: Number of indices created automatically.
# nmanindex: Number of indices created manually.
# user_payload:
# user_payload: Number of bytes of payload in table btrees
# (not including sqlite_master)
# user_percent: $user_payload as a percentage of total file size.
set file_bytes [file size $file_to_analyze]
set file_pgcnt [expr {$file_bytes/$pageSize}]
set av_pgcnt [autovacuum_overhead $file_pgcnt $pageSize]
set av_percent [percent $av_pgcnt $file_pgcnt]
set q {SELECT sum(leaf_pages+int_pages+ovfl_pages) FROM space_used}
set inuse_pgcnt [expr [mem eval $q]]
set sql {SELECT sum(leaf_pages+int_pages+ovfl_pages) FROM space_used}
set inuse_pgcnt [expr [mem eval $sql]]
set inuse_percent [percent $inuse_pgcnt $file_pgcnt]
set free_pgcnt [expr $file_pgcnt-$inuse_pgcnt-$av_pgcnt]
set free_percent [percent $free_pgcnt $file_pgcnt]
set free_pgcnt2 [lindex [btree_get_meta $DB] 0]
set free_percent2 [percent $free_pgcnt2 $file_pgcnt]
set file_pgcnt2 [expr {$inuse_pgcnt+$free_pgcnt2+$av_pgcnt}]
set ntable [db eval {SELECT count(*)+1 FROM sqlite_master WHERE type='table'}]
set nindex [db eval {SELECT count(*) FROM sqlite_master WHERE type='index'}]
set q {SELECT count(*) FROM sqlite_master WHERE name LIKE 'sqlite_autoindex%'}
set nautoindex [db eval $q]
set sql {SELECT count(*) FROM sqlite_master WHERE name LIKE 'sqlite_autoindex%'}
set nautoindex [db eval $sql]
set nmanindex [expr {$nindex-$nautoindex}]
# set total_payload [mem eval "SELECT sum(payload) FROM space_used"]
set user_payload [mem one {SELECT sum(payload) FROM space_used
WHERE NOT is_index AND name NOT LIKE 'sqlite_master'}]
set user_payload_percent [percent $user_payload $file_bytes]
set user_percent [percent $user_payload $file_bytes]
# Output the summary statistics calculated above.
#
puts "/** Disk-Space Utilization Report For $file_to_analyze"
puts "*** As of [clock format [clock seconds] -format {%Y-%b-%d %H:%M:%S}]"
puts ""
statline {Page size in bytes} $pageSize
statline {Pages in the whole file (measured)} $file_pgcnt
statline {Pages in the whole file (calculated)} $file_pgcnt2
statline {Pages that store data} $inuse_pgcnt $inuse_percent
statline {Pages on the freelist (per header)} $free_pgcnt2 $free_percent2
statline {Pages on the freelist (calculated)} $free_pgcnt $free_percent
statline {Pages of auto-vacuum overhead} $av_pgcnt $av_percent
statline {Number of tables in the database} $ntable
statline {Number of indices} $nindex
statline {Number of named indices} $nmanindex
statline {Automatically generated indices} $nautoindex
statline {Size of the file in bytes} $file_bytes
statline {Bytes of user payload stored} $user_payload $user_payload_percent
statline {Bytes of user payload stored} $user_payload $user_percent
# Output table rankings
#
puts ""
puts "*** Page counts for all tables with their indices ********************"
puts ""
mem eval {SELECT tblname, count(*) AS cnt,
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