So listen Sie alle Tabellen in der aktuellen Datenbank zusammen mit der Anzahl der Zeilen der Tabelle auf.

Mit anderen Worten, können Sie sich eine Abfrage vorstellen, um so etwas in MySQL zu finden?

+------------------------++------------------------+
| Tables_in_database     |  Number of rows         |
+------------------------++------------------------+
| database 1             |   1000                  |
| database 2             |   1500                  |
+------------------------++------------------------+

Unterschiedliche Ansätze sind willkommen.

Ich habe einen sehr aggressiven Ansatz mit Brute Force Dynamic SQL

SET group_concat_max_len = 1024 * 1024 * 100;
SELECT CONCAT('SELECT * FROM (',GROUP_CONCAT(CONCAT('SELECT ',QUOTE(tb),' Tables_in_database,
COUNT(1) "Number of Rows" FROM ',db,'.',tb) SEPARATOR ' UNION '),') A;')
INTO @sql FROM (SELECT table_schema db,table_name tb
FROM information_schema.tables WHERE table_schema = DATABASE()) A;
PREPARE s FROM @sql; EXECUTE s; DEALLOCATE PREPARE s;

Beispiel: In meiner Testdatenbank erhalte ich dies

mysql> use test
Database changed
mysql> SET group_concat_max_len = 1024 * 1024 * 100;
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT CONCAT('SELECT * FROM (',GROUP_CONCAT(CONCAT('SELECT ',QUOTE(tb),' Tables_in_database,
    '> COUNT(1) "Number of Rows" FROM ',db,'.',tb) SEPARATOR ' UNION '),') A;')
    -> INTO @sql FROM (SELECT table_schema db,table_name tb
    -> FROM information_schema.tables WHERE table_schema = DATABASE()) A;
Query OK, 1 row affected (0.00 sec)

mysql> PREPARE s FROM @sql; EXECUTE s; DEALLOCATE PREPARE s;
Query OK, 0 rows affected (0.00 sec)
Statement prepared

+--------------------+----------------+
| Tables_in_database | Number of Rows |
+--------------------+----------------+
| biblio             |              3 |
| biblio_old         |              7 |
| dep                |              5 |
| e                  |             14 |
| emp                |              4 |
| fruit              |             12 |
| fruit_outoforder   |             12 |
| nums_composite     |              0 |
| nuoji              |              4 |
| prod               |              3 |
| prodcat            |              6 |
| test2              |              9 |
| worktable          |              5 |
| yoshi_scores       |             24 |
+--------------------+----------------+
14 rows in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql>

VERSUCHE ES !!!

CAVEAT: Wenn alle Tabellen MyISAM sind, geschieht dies sehr schnell. Wenn alle Tabellen InnoDB sind, wird jede Tabelle gezählt. Dies kann für sehr große InnoDB-Tabellen brutal und unerbittlich sein.

Versuchen Sie die folgende Abfrage ohne dynamische Abfrage

SELECT Table_name AS TablesInDatabase ,table_rows AS NumberOfRows 
FROM information_schema.tables 
WHERE Table_schema=DATABASE(); 

Vielleicht kann diese Abfrage hilfreich sein. Es zeigt die Datengröße und Anzahl der Datensätze.

SET @table=(SELECT DATABASE());
select @table;
SELECT 
     table_schema as `Database`, 
     table_name AS `Table`, 
     round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`,
     table_rows as 'Rows'
FROM information_schema.TABLES 
WHERE table_schema = @table
ORDER BY (data_length + index_length) DESC;

Erhalten Sie mithilfe des Shell-Skripts genaue Zeilenzahlen für alle Tabellen in MySQL.

Setzen Sie den Parameter in der Datei parameter.config als

# Server Details
host_server=10.109.25.37

# Mysql credentials
mysql_user=root
mysql_pass=root
mysql_port=3306

Das zu zählende Skript lautet:

#!/bin/bash
# This Script is used to take rows count of mysql all user database

# Read Parameter
source parameter.config

# Find path
MY_PATH="`dirname \"$0\"`"
#echo "$MY_PATH"

start=`date +%s`
echo -e "\n\n"
echo MySQL script start runing at Date and Time is: `date +"%D %T"`
echo -e "@@@ Start of rows Count of MySQL on Old Ficus Release $host_server @@@"

echo -e "\n***** MySQL Rows Count Start *****"

#Make directory to save rows count
NOW="$(date +%Y%m%dT%H%M%S)"
dir_name="mysqlRows_$host_server"
if [ ! -d "$MY_PATH/$dir_name" ]; then
    mkdir "$MY_PATH/$dir_name"
fi
echo -e "\n..... Directory $dir_name is Created for mysql....."

echo -e "\n..... Check MySQL Connection ....."
# Verifying mysql connections on new release machine
MYSQL_CONN="-u$mysql_user -p$mysql_pass -h$host_server"
mysql ${MYSQL_CONN} -e "exit"
if [ $? -eq 0 ];
then
    echo -e "\n..... MySQL Database Connection Successful on server $host_server ....."
else
    echo -e "\n..... MySQL Database Connection Fail. Please verify $host_server credential ....."
    exit
fi

echo -e "\nReading MySQL database names..."
mysql ${MYSQL_CONN} -ANe "SELECT schema_name FROM information_schema.schemata WHERE schema_name NOT IN ('mysql','information_schema','performance_schema')" > $MY_PATH/$dir_name/dbs_$NOW.txt
DBS="$(cat $MY_PATH/$dir_name/dbs_$NOW.txt)"
# echo -e "\nList of databases:\t" ${DBS}

echo -e "\n..... Running for row count of tables of all user databases ....."

# All User databases
for db in ${DBS[@]}
do
    # echo $db , ${db[@]} 
    # Find list of database
    echo -e "\n\t... Running for ${db[@]} database tables list ..."
    mysql ${MYSQL_CONN} -ANe "SELECT  TABLE_NAME FROM information_schema.TABLES WHERE  TABLE_SCHEMA IN ('${db[@]}')" > $MY_PATH/$dir_name/${db[@]}_tables_$NOW.txt
    TBL="$(cat $MY_PATH/$dir_name/${db[@]}_tables_$NOW.txt)"
    # echo "Table in $db are:" ${TBL[@]}, $MY_PATH/$dir_name/${db[@]}_tables.txt

    echo -e "\n\t... Running for ${db[@]} database tables rows count ..."
    for tbs in ${TBL[@]}
    do
        # echo $tbs , ${tbs[@]}
        count=$(mysql -u$mysql_user -p$mysql_pass -h$host_server ${db[@]} -N -e "select count(*) from ${tbs[@]}")
        # count="$(cat /tmp/$db_rows_$NOW.txt)"
        # echo "Row in $tb Table of $db database are:" ${count[@]}
        echo -e "${db[@]},${tbs[@]},$count" >> $MY_PATH/$dir_name/${db[@]}_rows_$NOW.csv
        echo -e "${db[@]},${tbs[@]},$count" >> $MY_PATH/$dir_name/alldbs_rows_$NOW.csv
    done
done
echo -e "\n..... End of rows count of tables of all databases ....."

echo -e "\n===== MySQL Rows Count End ====="

# Display script execution time.
echo -e "@@@ Completion of Rows Count of MySQL on old Release $host_server @@@"
echo Script ended at Date and Time is: `date +"%D %T"`
end=`date +%s`
runtime=$((end-start))
echo -e "Time(in second) taken for running MySQL row count script:" $runtime "Sec."

Speichern Sie dies in der Datei "mysqlrowscount.sh". Führen Sie dieses Skript mit dem folgenden Befehl aus:

bash mysqlrowscount.sh