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Recommend ALTER TABLE ... FORCE for InnoDB defrag

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This commit is contained in:
Daniel Lewart 2022-12-29 02:42:05 -06:00
parent 25abba9bc1
commit ec165a6e2d
1 changed files with 15 additions and 11 deletions
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26
mysqltuner.pl
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@ -2471,7 +2471,7 @@ sub check_storage_engines {
}
$result{'Tables'}{'Fragmented tables'} =
[ select_array
"SELECT CONCAT(CONCAT(TABLE_SCHEMA, '.'), TABLE_NAME),cast(DATA_FREE as signed) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema', 'performance_schema', 'mysql') AND DATA_LENGTH/1024/1024>100 AND cast(DATA_FREE as signed)*100/(DATA_LENGTH+INDEX_LENGTH+cast(DATA_FREE as signed)) > 10 AND NOT ENGINE='MEMORY' $not_innodb"
"SELECT TABLE_SCHEMA, TABLE_NAME, ENGINE, CAST(DATA_FREE AS SIGNED) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema', 'performance_schema', 'mysql') AND DATA_LENGTH/1024/1024>100 AND cast(DATA_FREE as signed)*100/(DATA_LENGTH+INDEX_LENGTH+cast(DATA_FREE as signed)) > 10 AND NOT ENGINE='MEMORY' $not_innodb"
];
$fragtables = scalar @{ $result{'Tables'}{'Fragmented tables'} };
@ -2561,21 +2561,25 @@ sub check_storage_engines {
# Fragmented tables
if ( $fragtables > 0 ) {
badprint "Total fragmented tables: $fragtables";
push( @generalrec,
"Run OPTIMIZE TABLE to defragment tables for better performance" );
push @generalrec,
'Run ALTER TABLE ... FORCE or OPTIMIZE TABLE to defragment tables for better performance';
my $total_free = 0;
foreach my $table_line ( @{ $result{'Tables'}{'Fragmented tables'} } ) {
my ( $full_table_name, $data_free ) = split( /\s+/, $table_line );
$data_free = 0 if ( !defined($data_free) or $data_free eq '' );
my ( $table_schema, $table_name, $engine, $data_free ) =
split /\t/msx, $table_line;
$data_free = $data_free / 1024 / 1024;
$total_free += $data_free;
my ( $table_schema, $table_name ) = split( /\./, $full_table_name );
push( @generalrec,
" OPTIMIZE TABLE `$table_schema`.`$table_name`; -- can free $data_free MB"
);
my $generalrec;
if ( $engine eq 'InnoDB' ) {
$generalrec = " ALTER TABLE `$table_schema`.`$table_name` FORCE;";
} else {
$generalrec = " OPTIMIZE TABLE `$table_schema`.`$table_name`;";
}
$generalrec .= " -- can free $data_free MiB";
push @generalrec, $generalrec;
}
push( @generalrec,
"Total freed space after theses OPTIMIZE TABLE : $total_free Mb" );
push @generalrec,
"Total freed space after defragmentation : $total_free MiB";
}
else {
goodprint "Total fragmented tables: $fragtables";