MySQL自用脚本（不定期更新）

查询指定SQL的trace信息

mysql -uUSER -pPWD -hHOST -e "\
use ins_tc_prd; \
set session optimizer_trace='enabled=on'; \
set optimizer_trace_max_mem_size = ; \
explain SQL; \
select * from information_schema.optimizer_trace\G;" > trace_log.log

查看表空间的使用情况

select table_name,
       (data_length+ index_length) /1024/1024 as total_mb,
       table_rows
from information_schema.tables
where table_schema= 'Database' ;//不写就是全部

查看MySQL数据库状态

mysqladmin -P3306 -uroot -p -h127.0.0. -r -i  extended-status |awk -F"|" "BEGIN{ count=0; }"'{ if($2 ~ /Variable_name/ && ((++count)%20 == 1)){\
print "----------|---------|--- MySQL Command Status --|----- Innodb row operation -----|-- Buffer Pool Read --";\
print "---Time---|---QPS---|select insert update delete|  read  inserted updated deleted|   logical    physical";\
}\
else if ($ ~ /Queries/){queries=$;}\
else if ($ ~ /Com_select /){com_select=$;}\
else if ($ ~ /Com_insert /){com_insert=$;}\
else if ($ ~ /Com_update /){com_update=$;}\
else if ($ ~ /Com_delete /){com_delete=$;}\
else if ($ ~ /Innodb_rows_read/){innodb_rows_read=$;}\
else if ($ ~ /Innodb_rows_deleted/){innodb_rows_deleted=$;}\
else if ($ ~ /Innodb_rows_inserted/){innodb_rows_inserted=$;}\
else if ($ ~ /Innodb_rows_updated/){innodb_rows_updated=$;}\
else if ($ ~ /Innodb_buffer_pool_read_requests/){innodb_lor=$;}\
else if ($ ~ /Innodb_buffer_pool_reads/){innodb_phr=$;}\
else if ($ ~ /Uptime / && count >= ){\
printf(" %s |%9d",strftime("%H:%M:%S"),queries);\
printf("|%6d %6d %6d %6d",com_select,com_insert,com_update,com_delete);\
printf("|%8d %6d %7d %7d",innodb_rows_read,innodb_rows_inserted,innodb_rows_updated,innodb_rows_deleted);\
printf("|%10d %11d\n",innodb_lor,innodb_phr);\
}}';

MySQL查询阻塞语句

select r.trx_id waiting_trx_id, r.trx_mysql_thread_Id waiting_thread,
       r.trx_query waiting_query, b.trx_id blocking_trx_id,
       b.trx_mysql_thread_id blocking_thread, b.trx_query blocking_query
  from information_schema.innodb_lock_waits w inner join information_schema.innodb_trx b on b.trx_id = w.blocking_trx_id
  inner join information_schema.innodb_trx r on r.trx_id = w.requesting_trx_id;

导出语句

--导出建表语句和数据
/opt/mysql/bin/mysqldump  --defaults-file=/opt/mysql/my.cnf -uroot -p123456 -hlocalhost  -R --single-transaction  --default-character-set=utf8  dentist ds_user  uas_user  ds_organization  > /opt/mysql/bak_dir/table.sql

--dentist 数据库名称
-- ds_user  uas_user  ds_organization  表名称

--导出建表语句 不包含数据
/opt/mysql/bin/mysqldump  --defaults-file=/opt/mysql/my.cnf -uroot -p123456 -hlocalhost  -R --single-transaction  --default-character-set=utf8 -d  dentist ds_user  uas_user  ds_organization  > /opt/mysql/bak_dir/table.sql

查询表的数据量大小

select table_name,(data_length + index_length)/1024/1024 as table_mb,table_rows
from information_schema.tables
where table_schema='zabbix';

也可以在系统上直接查看表对应的数据文件大小

转自

1. http://blog.itpub.net/29510932/viewspace-1812475/