私はc＃でアプリケーションを作成しました。それはあなたの優先順位に従って重複したインデックスを削除します、それが役立つことを願っています
多くの改善が必要かもしれませんが、私が知っているのは...プライマリ（複合）と外部キーに同時に関与する重複インデックスだけを削除するわけではありません（通常は良いアプローチではないはずです）
ソース付きの完全なアプリケーションのダウンロードリンクは次のとおりです
上記リンクのメインファイルは以下のとおりです
using System;
using System.Data;
using MySql.Data.MySqlClient;
using System.Collections.Generic;
namespace duplicateIndexRemover
{
public class duplicateIndexRemover
{
static List<string> toDrop;
public string main(System.Windows.Forms.DataGridView dgv, System.Windows.Forms.DataGridView dgv1, string dbName)
{
try
{
toDrop = new List<string>();
List<table> tbs = new List<table>();
DataTable dt1 = new DataTable();
string cnStr = "SERVER=localhost;DATABASE=" + dbName + ";UID=root;";
MySqlConnection conn = new MySqlConnection(cnStr);
MySqlCommand cmd = conn.CreateCommand();
cmd.CommandText = @"SELECT Table_Name,Column_Name,Index_Name,NON_UNIQUE
FROM information_schema.STATISTICS
WHERE table_schema = '" + dbName + "' order by Table_Name,Column_Name,Index_Name";
MySqlDataAdapter adp = new MySqlDataAdapter(cmd);
DataTable dt = new DataTable();
adp.Fill(dt);
dgv.DataSource = dt;
for (int i = 0; i < dt.Columns.Count - 1; i++)
dt1.Columns.Add(dt.Columns[i].ColumnName);
table tb = new table();
column cl = new column();
index dx = new index();
tb.nam = dt.Rows[0][0].ToString();
cl = addColumn(dt, tb, 0);
tbs.Add(tb);
for (int i = 1; i < dt.Rows.Count; i++)
{
if (tb.nam != dt.Rows[i][0].ToString())
{
// 1st column of (current) t_th table
tb = new table();
tb.nam = dt.Rows[i][0].ToString();
cl = addColumn(dt, tb, i);
tbs.Add(tb);
}
else
{
if (cl.nam != dt.Rows[i][1].ToString())
cl = addColumn(dt, tb, i);
else
{
// Duplicate Indices
// But this one may be primary/unique key
// Then it would not be good to make a drop statement for this index here
// It may be improvable, but i can not apply as well condition here if it is not primary key
addIndex(dt, cl, i);
}
}
}
makeDropStatements(tbs, dt1);
dgv1.DataSource = dt1;
cmd.Connection.Open();
for (int i = 0; i < toDrop.Count; i++)
{
cmd.CommandText = toDrop[i];
try
{
cmd.ExecuteScalar();
}
catch//(Exception ex)
{
//System.Windows.Forms.MessageBox.Show("Table : " + dt1.Rows[i][0] + " Column : " + dt1.Rows[i][1] + "\n\n" + ex.Message);
}
}
cmd.CommandText = @"select table_name from information_schema.STATISTICS
WHERE table_schema = '" + dbName + "' group by table_name,column_name";
DataTable dg = new DataTable();
adp.Fill(dg);
string msg = " Total Number of Indices : " + dt.Rows.Count;
msg += "\t Droppable Indices : " + toDrop.Count;
msg += "\t Total Number of Indexed Columns : " + dg.Rows.Count;
return msg;
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
return ex.Message;
}
}
private static column addColumn(DataTable dt, table tb, int i)
{
column cl = new column();
// 1st index of i_th column of t_th table
cl.nam = dt.Rows[i][1].ToString();
addIndex(dt, cl, i);
tb.cols.Add(cl);
return cl;
}
private static void addIndex(DataTable dt, column cl, int i)
{
index dx = new index();
dx.nam = dt.Rows[i][2].ToString();
dx.non_unique = Convert.ToBoolean(dt.Rows[i][3]);
cl.indices.Add(dx);
}
private static void makeDropStatements(List<table> tbs, DataTable dt1)
{
bool chekd;
List<index> temp;
for (int t = 0; t < tbs.Count; t++)
{
for (int i = 0; i < tbs[t].cols.Count; i++)
{
temp = tbs[t].cols[i].indices;
if (temp.Count > 1)
{
chekd = false;
for (int j = 0; j < temp.Count; j++)
{
if (temp[j].nam == "PRIMARY")
{
getToDropIndices(tbs[t].nam, tbs[t].cols[i].nam, temp, j, dt1);
chekd = true;
break;
}
}
if (!chekd)
{
for (int j = 0; j < temp.Count; j++)
{
if (!temp[j].non_unique)
{
getToDropIndices(tbs[t].nam, tbs[t].cols[i].nam, temp, j, dt1);
chekd = true;
break;
}
}
}
if (!chekd)
{
getToDropIndices(tbs[t].nam, tbs[t].cols[i].nam, temp, 0, dt1);
chekd = true;
break;
}
}
}
}
}
private static void getToDropIndices(string tbl, string col, List<index> sublist, int nt, DataTable dt1)
{
for (int j = 0; j < nt; j++)
{
toDrop.Add("alter table `" + tbl + "` drop index " + sublist[j].nam);
dt1.Rows.Add(dt1.NewRow());
int r = dt1.Rows.Count - 1;
dt1.Rows[r][0] = tbl;
dt1.Rows[r][1] = col;
dt1.Rows[r][2] = sublist[j].nam;
}
for (int j = nt + 1; j < sublist.Count; j++)
{
toDrop.Add("alter table `" + tbl + "` drop index " + sublist[j].nam);
dt1.Rows.Add(dt1.NewRow());
int r = dt1.Rows.Count - 1;
dt1.Rows[r][0] = tbl;
dt1.Rows[r][1] = col;
dt1.Rows[r][2] = sublist[j].nam;
}
}
}
public class table
{
public List<column> cols =new List<column>();
public string nam = "";
}
public class column
{
public List<index> indices = new List<index>();
public string nam = "";
}
public class index
{
public string nam = "";
public bool non_unique;
}
}
インデックスを表示するためだけのグリッドビューは無視/削除できます。main関数を呼び出すだけです