Générez des instructions SQL MySQL pour supprimer des index, créer des index et analyser des tables

Table des matières

1. Générez l'instruction SQL pour supprimer l'index

2. Générez l'instruction SQL pour créer l'index

3. Générez l'instruction SQL pour la table d'analyse

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1. Générez l'instruction SQL pour supprimer l'index

mysql -uwxy -p12345 -S /data/18253/mysqldata/mysql.sock -e "
select concat('alter table \`',table_schema,'\`.\`',table_name,'\` ',drop_index,';')
  from (
select table_schema, table_name, group_concat(if(index_name='PRIMARY','drop primary key',concat('drop index \`',index_name,'\`'))) drop_index
  from (
select distinct table_schema, table_name, index_name
  from information_schema.statistics
 where table_schema in ('test')
   and (table_schema, table_name, index_name) not in (
select t1.table_schema, t1.table_name, t1.index_name
  from information_schema.statistics t1, information_schema.columns t2
 where t1.table_schema in ('test')
   and t1.table_schema = t2.table_schema and t1.table_name = t2.table_name and t1.column_name = t2.column_name
   and t2.extra='auto_increment')) t
 group by table_schema, table_name) t;" -N > drop_index.sql

2. Générez l'instruction SQL pour créer l'index

mysql -uwxy -p12345 -S /data/18253/mysqldata/mysql.sock -e "
select concat('alter table \`',table_schema,'\`.\`',table_name,'\` ',create_index,';')
  from (
select table_schema, table_name, group_concat(if(index_name='PRIMARY',concat('add primary key (',index_columns,')'),concat('add index \`',index_name,'\` (',index_columns,')'))) create_index
  from (
select table_schema, table_name, index_name, group_concat(concat('\`',column_name,'\`', if(sub_part is null,'',concat('(',sub_part,')'))) order by seq_in_index) index_columns
  from information_schema.statistics
 where table_schema in ('test')
   and (table_schema, table_name, index_name) not in (
select t1.table_schema, t1.table_name, t1.index_name
  from information_schema.statistics t1, information_schema.columns t2
 where t1.table_schema in ('test')
   and t1.table_schema = t2.table_schema and t1.table_name = t2.table_name and t1.column_name = t2.column_name
   and t2.extra='auto_increment')
 group by table_schema, table_name, index_name) t
 group by table_schema, table_name) t;" -N > create_index.sql

3. Générez l'instruction SQL pour la table d'analyse

mysql -uwxy -p12345 -S /data/18253/mysqldata/mysql.sock -e "
select concat('analyze table \`',table_schema,'\`.\`',table_name,'\`;') 
  from information_schema.tables 
 where table_schema in ('test');" -N > analyze_table.sql