OracleBlog – 第 3 页 – 笑看数据库江湖的那些事儿……

阿里云的rds的几个问题的探究

2022-04-25 一条评论

1. 阿里云的pg一键上云，其实是调用了pg_basebackup，这个功能不仅仅可以用在一键上云上，还能用在rds pg到rds pg的小版本升级上。 2. 阿里云的pg大版本升级过程：（一）准备阶段： 2.1 界面发起大版本升级； 2.2 原实例snapshot（注，需要打开秒级备份功能，不然 […]

..experience, Working case

pg_hba.conf文件的策略顺序

2022-02-11 没有评论

原来一直以为这个文件中，每一行的顺序是没有区别的，但是最近的一个需求，研究时发现，原来这个文件对登录的会话，是从上往下依次判断的：具体的规则是：

1. 登录的会话，会顺着pg_hba.conf的策略一条一条往下走。
2. 如果遇到匹配到的规则，那么做成判断，是信任，还是拒绝，还是验证密码。后续就不往下走继续判断规则了。
3. 如果某一条规则不符合，没匹配成功，就继续往下走，继续做判断，直到所有的规则都判断完毕。

1. 登录的会话，会顺着pg_hba.conf的策略一条一条往下走。

2. 如果遇到匹配到的规则，那么做成判断，是信任，还是拒绝，还是验证密码。后续就不往下走继续判断规则了。

3. 如果某一条规则不符合，没匹配成功，就继续往下走，继续做判断，直到所有的规则都判断完毕。

因此，如果我有一个用于备份的用户，叫anybackup（爱数备份软件），由于权限设置的 […]

..experience, Working case

数据库IO链路访问图

2022-01-11 没有评论

..experience, Working case

从千年虫bug的问题谈开去

2022-01-07 没有评论

最近微软又爆了一个千年虫的bug，微软FIP-FS反恶意软件扫描引擎由于Year 2022漏洞导致Exchange服务器无法发送邮件。另外，本田、讴歌汽车也爆了Y2K22千年虫漏洞。这是因为，在程序中，或者数据库中，字段类型定义成int32字段类型。而int32，一共32位，第一位表示符号，因此 […]

..experience, Working case

减少mysqlbackup 对IO压力的影响

2021-12-20 没有评论

通常情况下，我们总是系统备份的速度是越快越好。但是，有时候这会导致IO压力，我们需要削峰处理。我之前写过一个减少rman备份对OLTP系统的影响，其实mysql的备份（使用 MySQL Enterprise Backup）也可以采用类似的方法：我们在mysqlbackup命令中，添加sleep […]

..dba script, Useful script

Oralce undo健康检查脚本

2021-01-05 一条评论

Oracle的进程，如果在os层面kill -9了，那么在v$transaction中是看不到的，需要在v$fast_start_transactions中去看。可以用下面2种方法预估回滚时间：方法一：（利用v$fast_start_transaction） [crayon-679080cd336 […]

..dba script, Useful script

Postgresql数据库层限流脚本

2020-11-26 没有评论

Postgresql数据库层限流脚本：

with tmp3 as
(select count(*) as cnt from pg_stat_activity WHERE pid <> pg_backend_pid() and datname='mypg1' and usename='postgres' and state='idle' and query like '%select now%')
select 
case
 when cnt <= 400 then 
 (with tmp1 as ( select pg_terminate_backend(pid) from  (select pid from pg_stat_activity WHERE 1=2 ) as foo1)
 select count(*) from tmp1 )
 when cnt > 400 then 
 (with tmp2 as ( select pg_terminate_backend(pid) from  (select pid from pg_stat_activity WHERE pid <> pg_backend_pid() and datname='mypg1' and usename='postgres' 
                and state='active' and query like '%select now%' order by backend_start 
                limit 10) as foo2)
 select count(*) from tmp2 )
end as kill_if_too_many_process
from tmp3 \watch 1

with tmp3 as

(select count(*) as cnt from pg_stat_activity WHERE pid <> pg_backend_pid() and datname='mypg1' and usename='postgres' and state='idle' and query like '%select now%')

select

case

when cnt <= 400 then

(with tmp1 as ( select pg_terminate_backend(pid) from (select pid from pg_stat_activity WHERE 1=2 ) as foo1)

select count(*) from tmp1 )

when cnt > 400 then

(with tmp2 as ( select pg_terminate_backend(pid) from (select pid from pg_stat_activity WHERE pid <> pg_backend_pid() and datname='mypg1' and usename='postgres'

and state='active' and query like '%select now%' order by backend_start

limit 10) as foo2)

select count(*) from tmp2 )

end as kill_if_too_many_process

from tmp3 \watch 1

作用：程序执行的语句为类似select now语句，并且该进程是activie的，当这样的进程超过400个时，按照进程发起的先后顺序，先杀掉早期的进程。该语句每秒检查一次，每次发现有超过400个 […]

..experience, Working case

为什么说不要在pg 12前，用原生hash分区

2020-11-20 没有评论

pg在11之前，有原生的range分区和list分区，但是没有原生的hash分区。 hash分区是需要通过pg_pathman插件来实现。如果你从原来pg 10版本+pg_pathman实现hash分区，且分区数比较多，比如1024个分区，那么到你升级到pg 11之后，如果采用了原生分区，你会发现 […]

Useful script

mysql awr脚本部署

2020-09-24 没有评论

这个脚本是用来在mysql数据库中创建一个myawr数据库，记录数据库中记录active session。 cat /root/user/myawr.sql

--先创建myawr数据库
create database myawr DEFAULT CHARACTER SET utf8mb4;

1 2	--先创建myawr数据库 create database myawr DEFAULT CHARACTER SET utf8mb4;

use myawr;

CREATE TABLE myawr.`processliststatus` (
  `ID` bigint(21) unsigned NOT NULL DEFAULT '0',
  `USER` varchar(32) NOT NULL DEFAULT '',
  `HOST` varchar(64) NOT NULL DEFAULT '',
  `DB` varchar(64) DEFAULT NULL,
  `COMMAND` varchar(16) NOT NULL DEFAULT '',
  `TIME` int(7) NOT NULL DEFAULT '0',
  `STATE` varchar(64) DEFAULT NULL,
  `INFO` longtext,
  `clock` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `snapid` bigint(20) DEFAULT NULL,
  KEY `idx_clock` (`clock`),
  key idx_snapid(snapid)
);


CREATE TABLE myawr.`mysqldumplog` (
  `ID` bigint unsigned NOT NULL DEFAULT '0',
  `USER` varchar(32) NOT NULL DEFAULT '',
  `HOST` varchar(64) NOT NULL DEFAULT '',
  `DB` varchar(64) DEFAULT NULL,
  `COMMAND` varchar(16) NOT NULL DEFAULT '',
  `TIME` int NOT NULL DEFAULT '0',
  `STATE` varchar(64) DEFAULT NULL,
  `INFO` longtext,
  `clock` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  KEY `idx_clock` (`clock`)
);


CREATE TABLE myawr.`lockstatus` (
  `clock` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `wating_trx_state` varchar(255) DEFAULT NULL,
  `waiting_trx_id` bigint DEFAULT NULL,
  `waiting_thread` bigint DEFAULT NULL,
  `waiting_query` varchar(2000) DEFAULT NULL,
  `blocking_trx_state` varchar(255) DEFAULT NULL,
  `blocking_trx_id` bigint DEFAULT NULL,
  `blocking_thread` bigint DEFAULT NULL,
  `blocking_query` varchar(2000) DEFAULT NULL,
  `snapid` bigint(20) DEFAULT NULL,
  KEY `idx_clock` (`clock`),
  key idx_snapid(snapid)
);


DELIMITER $$
CREATE PROCEDURE myawr.`partition_verify`(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64), HOURLYINTERVAL INT(11))
BEGIN
        DECLARE PARTITION_NAME VARCHAR(16);
        DECLARE RETROWS INT(11);
        DECLARE FUTURE_TIMESTAMP TIMESTAMP;
        /*
         * Check if any partitions exist for the given SCHEMANAME.TABLENAME.
         */
        SELECT COUNT(1) INTO RETROWS
        FROM information_schema.partitions
        WHERE table_schema = SCHEMANAME AND table_name = TABLENAME AND partition_name IS NULL;
        /*
         * If partitions do not exist, go ahead and partition the table
         */
        IF RETROWS = 1 THEN
                /*
                 * Take the current date at 00:00:00 and add HOURLYINTERVAL to it.  This is the timestamp below which we will store values.
                 * We begin partitioning based on the beginning of a day.  This is because we don't want to generate a random partition
                 * that won't necessarily fall in line with the desired partition naming (ie: if the hour interval is 24 hours, we could
                 * end up creating a partition now named "p201403270600" when all other partitions will be like "p201403280000").
                 */
                SET FUTURE_TIMESTAMP = TIMESTAMPADD(HOUR, HOURLYINTERVAL, CONCAT(CURDATE(), " ", '00:00:00'));
                SET PARTITION_NAME = DATE_FORMAT(CURDATE(), 'p%Y%m%d%H00');
                -- Create the partitioning query
                SET @__PARTITION_SQL = CONCAT("ALTER TABLE ", SCHEMANAME, ".", TABLENAME, " PARTITION BY RANGE(UNIX_TIMESTAMP(`clock`))");
                SET @__PARTITION_SQL = CONCAT(@__PARTITION_SQL, "(PARTITION ", PARTITION_NAME, " VALUES LESS THAN (", UNIX_TIMESTAMP(FUTURE_TIMESTAMP), "));");
                -- Run the partitioning query
                PREPARE STMT FROM @__PARTITION_SQL;
                EXECUTE STMT;
                DEALLOCATE PREPARE STMT;
        END IF;
END $$



CREATE PROCEDURE myawr.`partition_create` ( SCHEMANAME VARCHAR ( 64 ), TABLENAME VARCHAR ( 64 ), PARTITIONNAME VARCHAR ( 64 ), CLOCK INT ) BEGIN
/*
SCHEMANAME = The DB schema in which to make changes
TABLENAME = The table with partitions to potentially delete
PARTITIONNAME = The name of the partition to create
*/
/*
Verify that the partition does not already exist
*/
DECLARE
RETROWS INT;
SELECT
COUNT( 1 ) INTO RETROWS 
FROM
information_schema.PARTITIONS 
WHERE
table_schema = SCHEMANAME 
AND table_name = TABLENAME 
AND partition_description >= CLOCK;
IF
RETROWS = 0 THEN
/*
1. Print a message indicating that a partition was created.
2. Create the SQL to create the partition.
3. Execute the SQL from #2.
*/
SELECT
CONCAT( "partition_create(", SCHEMANAME, ",", TABLENAME, ",", PARTITIONNAME, ",", CLOCK, ")" ) AS msg;
SET @SQL = CONCAT( 'ALTER TABLE ', SCHEMANAME, '.', TABLENAME, ' ADD PARTITION (PARTITION ', PARTITIONNAME, ' VALUES LESS THAN (', CLOCK, '));' );
PREPARE STMT 
FROM
@SQL;
EXECUTE STMT;
DEALLOCATE PREPARE STMT;
END IF;
END $$



CREATE PROCEDURE myawr.`partition_drop` ( SCHEMANAME VARCHAR ( 64 ), TABLENAME VARCHAR ( 64 ), DELETE_BELOW_PARTITION_DATE BIGINT ) BEGIN
/*
SCHEMANAME = The DB schema in which to make changes
TABLENAME = The table with partitions to potentially delete
DELETE_BELOW_PARTITION_DATE = Delete any partitions with names that are dates older than this one (yyyy-mm-dd)
*/
DECLARE
done INT DEFAULT FALSE;
DECLARE
drop_part_name VARCHAR ( 16 );
/*
Get a list of all the partitions that are older than the date
in DELETE_BELOW_PARTITION_DATE.  All partitions are prefixed with
a "p", so use SUBSTRING TO get rid of that character.
*/
DECLARE
myCursor CURSOR FOR SELECT
partition_name 
FROM
information_schema.PARTITIONS 
WHERE
table_schema = SCHEMANAME 
AND table_name = TABLENAME 
AND CAST( SUBSTRING( partition_name FROM 2 ) AS UNSIGNED ) < DELETE_BELOW_PARTITION_DATE;
DECLARE
CONTINUE HANDLER FOR NOT FOUND 
SET done = TRUE;
/*
Create the basics for when we need to drop the partition.  Also, create
@drop_partitions to hold a comma-delimited list of all partitions that
should be deleted.
*/
SET @alter_header = CONCAT( "ALTER TABLE ", SCHEMANAME, ".", TABLENAME, " DROP PARTITION " );
SET @drop_partitions = "";
/*
Start looping through all the partitions that are too old.
*/
OPEN myCursor;
read_loop :
LOOP
FETCH myCursor INTO drop_part_name;
IF
done THEN
LEAVE read_loop;
END IF;
SET @drop_partitions =
IF
( @drop_partitions = "", drop_part_name, CONCAT( @drop_partitions, ",", drop_part_name ) );
END LOOP;
IF
@drop_partitions != "" THEN
/*
                   1. Build the SQL to drop all the necessary partitions.
                   2. Run the SQL to drop the partitions.
                   3. Print out the table partitions that were deleted.
                */
SET @full_sql = CONCAT( @alter_header, @drop_partitions, ";" );
PREPARE STMT 
FROM
@full_sql;
EXECUTE STMT;
DEALLOCATE PREPARE STMT;
SELECT
CONCAT( SCHEMANAME, ".", TABLENAME ) AS `table`,
@drop_partitions AS `partitions_deleted`;
ELSE /*
                   No partitions are being deleted, so print out "N/A" (Not applicable) to indicate
                   that no changes were made.
                */
SELECT
CONCAT( SCHEMANAME, ".", TABLENAME ) AS `table`,
"N/A" AS `partitions_deleted`;
END IF;
END $$



CREATE PROCEDURE myawr.`partition_maintenance`(SCHEMA_NAME VARCHAR(32), TABLE_NAME VARCHAR(32), KEEP_DATA_DAYS INT, HOURLY_INTERVAL INT, CREATE_NEXT_INTERVALS INT)
BEGIN
        DECLARE OLDER_THAN_PARTITION_DATE VARCHAR(16);
        DECLARE PARTITION_NAME VARCHAR(16);
        DECLARE OLD_PARTITION_NAME VARCHAR(16);
        DECLARE LESS_THAN_TIMESTAMP INT;
        DECLARE CUR_TIME INT;
        CALL partition_verify(SCHEMA_NAME, TABLE_NAME, HOURLY_INTERVAL);
        SET CUR_TIME = UNIX_TIMESTAMP(DATE_FORMAT(NOW(), '%Y-%m-%d 00:00:00'));
        SET @__interval = 1;
        create_loop: LOOP
                IF @__interval > CREATE_NEXT_INTERVALS THEN
                        LEAVE create_loop;
                END IF;
                SET LESS_THAN_TIMESTAMP = CUR_TIME + (HOURLY_INTERVAL * @__interval * 3600);
                SET PARTITION_NAME = FROM_UNIXTIME(CUR_TIME + HOURLY_INTERVAL * (@__interval - 1) * 3600, 'p%Y%m%d%H00');
                IF(PARTITION_NAME != OLD_PARTITION_NAME) THEN
                        CALL partition_create(SCHEMA_NAME, TABLE_NAME, PARTITION_NAME, LESS_THAN_TIMESTAMP);
                END IF;
                SET @__interval=@__interval+1;
                SET OLD_PARTITION_NAME = PARTITION_NAME;
        END LOOP;
        SET OLDER_THAN_PARTITION_DATE=DATE_FORMAT(DATE_SUB(NOW(), INTERVAL KEEP_DATA_DAYS DAY), '%Y%m%d0000');
        CALL partition_drop(SCHEMA_NAME, TABLE_NAME, OLDER_THAN_PARTITION_DATE);
END$$



CREATE PROCEDURE myawr.proc_awr_killdump( )
BEGIN
declare dump_id INT default false;
DECLARE done INT DEFAULT FALSE;
DECLARE myCursor CURSOR FOR SELECT id FROM information_schema.PROCESSLIST WHERE INFO like 'SELECT /*!40001 SQL_NO_CACHE */ * FROM%';
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
SET @dump_id ='';
OPEN myCursor;
read_loop :
LOOP
FETCH myCursor INTO dump_id;
IF
done THEN
LEAVE read_loop;
END IF;
insert into myawr.mysqldumplog(ID,USER,HOST,DB,COMMAND,TIME,STATE,INFO) select ID,USER,HOST,DB,COMMAND,TIME,STATE,INFO from information_schema.processlist where id=dump_id;
call mysql.rds_kill(dump_id);
END LOOP;
END
$$




CREATE procedure myawr.proc_awr_getstatus()
begin
declare insertSessionCount INT default 0; -- 声明insert会话的计数器  
set @ha=unix_timestamp(now());
-- 查看是否有insert 会话
select count(*) into insertSessionCount  from  information_schema.processlist where INFO like 'insert into myawr.processliststatus%';
-- 如果之前存在未结束的insert会话，则本次不insert
IF  insertSessionCount <1   THEN  
-- 排除非活跃会话和系统会话,并做截断操作
insert into myawr.processliststatus(ID,USER,HOST,DB,COMMAND,TIME,STATE,INFO,snapid) select ID,USER,HOST,DB,COMMAND,TIME,STATE,substring(INFO,1,3000), @ha from information_schema.processlist  where COMMAND not in ('Sleep','Daemon','Binlog Dump GTID') and INFO not like 'insert into myawr.processliststatus%';   
END IF;  
 
insert into  myawr.lockstatus(wating_trx_state,waiting_trx_id,waiting_thread,waiting_query,blocking_trx_state,blocking_trx_id,blocking_thread,blocking_query,snapid) SELECT r.trx_state wating_trx_state,r.trx_id waiting_trx_id,r.trx_mysql_thread_Id waiting_thread,r.trx_query waiting_query,b.trx_state blocking_trx_state,b.trx_id blocking_trx_id,b.trx_mysql_thread_id blocking_thread,b.trx_query blocking_query,@ha 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;
end
$$


create procedure myawr.proc_awr_enable(proc_name varchar(64))
begin
/*declare proc_cursor varchar(64) default false;
DECLARE done INT DEFAULT FALSE;
DECLARE myCursor CURSOR FOR select name from mysql.event where db='myawr' and name like 'event\_awr\_%' and name not in ('event_awr_resetpartition');
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;*/
if proc_name = 'all' then
/*SET @proc_cursor ='';
OPEN myCursor;
read_loop :
LOOP
FETCH myCursor INTO proc_cursor;
IF
done THEN
LEAVE read_loop;
END IF;
alter event proc_cursor enable;
END LOOP;*/
select "抱歉，该参数现在还没能实现，敬请期待" as msg;
elseif proc_name = 'killdump' then
alter event event_awr_killdump enable;
select "enable event_awr_killdump succeed ~" as msg;
elseif proc_name = 'getmysqlstatus' then
alter event event_awr_getMysqlStatus enable;
select "enable event_awr_getMysqlStatus succeed ~" as msg;
else
select "参量输入有误抑或没有布置awr脚本！" as msg;
end if;
end
$$



create procedure myawr.proc_awr_disable(proc_name varchar(64))
begin
/*declare proc_cursor varchar(64) default false;
DECLARE done INT DEFAULT FALSE;
DECLARE myCursor CURSOR FOR select name from mysql.event where db='myawr' and name like 'event\_awr\_%' and name not in ('event_awr_resetpartition');
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;*/
if proc_name = 'all' then
/*SET @proc_cursor ='';
OPEN myCursor;
read_loop :
LOOP
FETCH myCursor INTO proc_cursor;
IF
done THEN
LEAVE read_loop;
END IF;
alter event proc_cursor enable;
END LOOP;*/
select "抱歉，该参数现在还没能实现，敬请期待" as msg;
elseif proc_name = 'killdump' then
alter event event_awr_killdump disable;
select "disable event_awr_killdump succeed ~" as msg;
elseif proc_name = 'getmysqlstatus' then
alter event event_awr_getMysqlStatus disable;
select "disable event event_awr_getMysqlStatus succeed ~" as msg;
else
select "参量输入有误抑或没有布置awr脚本！" as msg;
end if;
end
$$

CREATE PROCEDURE myawr.myawr_help()
BEGIN
select  "
1、实现功能：
1.1、默认每10s会收集一次mysql的processlist状态和锁等待情况。
1.2、默认每9s检查是否存在dump操作，如果存在将会kill线程，并且将此记录在mysqldump_log表中。
2、更改参数：
2.1、修改脚本收集或检查的频率
 最小时间不应该小于7s，否则可能会对数据库性能产生影响。
mysql> call proc_awr_changeint('killdump',5);
2.2、启用或停止脚本部分功能
mysql> call proc_awr_enable('all');
mysql> call proc_awr_enable('killdump');
mysql> call proc_awr_enable('getmysqlstatus');
mysql> call proc_awr_disable('all');
mysql> call proc_awr_disable('killdump');
mysql> call proc_awr_disable('getmysqlstatus');
3、dump操作：
3.1、停止非法dump监控事件
mysql> call proc_awr_disable('killdump');
4.2、进行dump操作
mysqldump --single-transaction ***
3.3、恢复监控事件
mysql> call proc_awr_enable('killdump');"  AS help_message;
end
$$


create event myawr.event_awr_getMysqlStatus
ON SCHEDULE
-- 每隔10秒运行
every 10 second
on completion preserve
do call proc_awr_getstatus();
$$



CREATE EVENT myawr.event_awr_killdump
ON SCHEDULE 
-- 每隔9秒运行
EVERY 9 SECOND 
ON COMPLETION PRESERVE
DO CALL proc_awr_killdump ();
$$




create event myawr.event_awr_resetpartition
ON SCHEDULE
every 1 day
on completion preserve
do
begin
call partition_maintenance('myawr','processliststatus',7,24,30);
call partition_maintenance('myawr','lockstatus',7,24,30);
end
$$

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

use myawr;

CREATE TABLE myawr.`processliststatus` (

`ID` bigint(21) unsigned NOT NULL DEFAULT '0',

`USER` varchar(32) NOT NULL DEFAULT '',

`HOST` varchar(64) NOT NULL DEFAULT '',

`DB` varchar(64) DEFAULT NULL,

`COMMAND` varchar(16) NOT NULL DEFAULT '',

`TIME` int(7) NOT NULL DEFAULT '0',

`STATE` varchar(64) DEFAULT NULL,

`INFO` longtext,

`clock` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,

`snapid` bigint(20) DEFAULT NULL,

KEY `idx_clock` (`clock`),

key idx_snapid(snapid)

);

CREATE TABLE myawr.`mysqldumplog` (

`ID` bigint unsigned NOT NULL DEFAULT '0',

`USER` varchar(32) NOT NULL DEFAULT '',

`HOST` varchar(64) NOT NULL DEFAULT '',

`DB` varchar(64) DEFAULT NULL,

`COMMAND` varchar(16) NOT NULL DEFAULT '',

`TIME` int NOT NULL DEFAULT '0',

`STATE` varchar(64) DEFAULT NULL,

`INFO` longtext,

`clock` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,

KEY `idx_clock` (`clock`)

);

CREATE TABLE myawr.`lockstatus` (

`clock` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,

`wating_trx_state` varchar(255) DEFAULT NULL,

`waiting_trx_id` bigint DEFAULT NULL,

`waiting_thread` bigint DEFAULT NULL,

`waiting_query` varchar(2000) DEFAULT NULL,

`blocking_trx_state` varchar(255) DEFAULT NULL,

`blocking_trx_id` bigint DEFAULT NULL,

`blocking_thread` bigint DEFAULT NULL,

`blocking_query` varchar(2000) DEFAULT NULL,

`snapid` bigint(20) DEFAULT NULL,

KEY `idx_clock` (`clock`),

key idx_snapid(snapid)

);

DELIMITER $$

CREATE PROCEDURE myawr.`partition_verify`(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64), HOURLYINTERVAL INT(11))

BEGIN

DECLARE PARTITION_NAME VARCHAR(16);

DECLARE RETROWS INT(11);

DECLARE FUTURE_TIMESTAMP TIMESTAMP;

* Check if any partitions exist for the given SCHEMANAME.TABLENAME.

SELECT COUNT(1) INTO RETROWS

FROM information_schema.partitions

WHERE table_schema = SCHEMANAME AND table_name = TABLENAME AND partition_name IS NULL;

* If partitions do not exist, go ahead and partition the table

IF RETROWS = 1 THEN

* Take the current date at 00:00:00 and add HOURLYINTERVAL to it. This is the timestamp below which we will store values.

* We begin partitioning based on the beginning of a day. This is because we don't want to generate a random partition

* that won't necessarily fall in line with the desired partition naming (ie: if the hour interval is 24 hours, we could

* end up creating a partition now named "p201403270600" when all other partitions will be like "p201403280000").

SET FUTURE_TIMESTAMP = TIMESTAMPADD(HOUR, HOURLYINTERVAL, CONCAT(CURDATE(), " ", '00:00:00'));

SET PARTITION_NAME = DATE_FORMAT(CURDATE(), 'p%Y%m%d%H00');

-- Create the partitioning query

SET @__PARTITION_SQL = CONCAT("ALTER TABLE ", SCHEMANAME, ".", TABLENAME, " PARTITION BY RANGE(UNIX_TIMESTAMP(`clock`))");

SET @__PARTITION_SQL = CONCAT(@__PARTITION_SQL, "(PARTITION ", PARTITION_NAME, " VALUES LESS THAN (", UNIX_TIMESTAMP(FUTURE_TIMESTAMP), "));");

-- Run the partitioning query

PREPARE STMT FROM @__PARTITION_SQL;

EXECUTE STMT;

DEALLOCATE PREPARE STMT;

END IF;

END $$

CREATE PROCEDURE myawr.`partition_create` ( SCHEMANAME VARCHAR ( 64 ), TABLENAME VARCHAR ( 64 ), PARTITIONNAME VARCHAR ( 64 ), CLOCK INT ) BEGIN

SCHEMANAME = The DB schema in which to make changes

TABLENAME = The table with partitions to potentially delete

PARTITIONNAME = The name of the partition to create

Verify that the partition does not already exist

DECLARE

RETROWS INT;

SELECT

COUNT( 1 ) INTO RETROWS

FROM

information_schema.PARTITIONS

WHERE

table_schema = SCHEMANAME

AND table_name = TABLENAME

AND partition_description >= CLOCK;

RETROWS = 0 THEN

1. Print a message indicating that a partition was created.

2. Create the SQL to create the partition.

3. Execute the SQL from #2.

SELECT

CONCAT( "partition_create(", SCHEMANAME, ",", TABLENAME, ",", PARTITIONNAME, ",", CLOCK, ")" ) AS msg;

SET @SQL = CONCAT( 'ALTER TABLE ', SCHEMANAME, '.', TABLENAME, ' ADD PARTITION (PARTITION ', PARTITIONNAME, ' VALUES LESS THAN (', CLOCK, '));' );

PREPARE STMT

FROM

@SQL;

EXECUTE STMT;

DEALLOCATE PREPARE STMT;

END IF;

END $$

CREATE PROCEDURE myawr.`partition_drop` ( SCHEMANAME VARCHAR ( 64 ), TABLENAME VARCHAR ( 64 ), DELETE_BELOW_PARTITION_DATE BIGINT ) BEGIN

SCHEMANAME = The DB schema in which to make changes

TABLENAME = The table with partitions to potentially delete

DELETE_BELOW_PARTITION_DATE = Delete any partitions with names that are dates older than this one (yyyy-mm-dd)

DECLARE

done INT DEFAULT FALSE;

DECLARE

drop_part_name VARCHAR ( 16 );

Get a list of all the partitions that are older than the date

in DELETE_BELOW_PARTITION_DATE. All partitions are prefixed with

a "p", so use SUBSTRING TO get rid of that character.

DECLARE

myCursor CURSOR FOR SELECT

partition_name

FROM

information_schema.PARTITIONS

WHERE

table_schema = SCHEMANAME

AND table_name = TABLENAME

AND CAST( SUBSTRING( partition_name FROM 2 ) AS UNSIGNED ) < DELETE_BELOW_PARTITION_DATE;

DECLARE

CONTINUE HANDLER FOR NOT FOUND

SET done = TRUE;

Create the basics for when we need to drop the partition. Also, create

@drop_partitions to hold a comma-delimited list of all partitions that

should be deleted.

SET @alter_header = CONCAT( "ALTER TABLE ", SCHEMANAME, ".", TABLENAME, " DROP PARTITION " );

SET @drop_partitions = "";

Start looping through all the partitions that are too old.

OPEN myCursor;

read_loop :

LOOP

FETCH myCursor INTO drop_part_name;

done THEN

LEAVE read_loop;

END IF;

SET @drop_partitions =

( @drop_partitions = "", drop_part_name, CONCAT( @drop_partitions, ",", drop_part_name ) );

END LOOP;

@drop_partitions != "" THEN

1. Build the SQL to drop all the necessary partitions.

2. Run the SQL to drop the partitions.

3. Print out the table partitions that were deleted.

SET @full_sql = CONCAT( @alter_header, @drop_partitions, ";" );

PREPARE STMT

FROM

@full_sql;

EXECUTE STMT;

DEALLOCATE PREPARE STMT;

SELECT

CONCAT( SCHEMANAME, ".", TABLENAME ) AS `table`,

@drop_partitions AS `partitions_deleted`;

ELSE /*

No partitions are being deleted, so print out "N/A" (Not applicable) to indicate

that no changes were made.

SELECT

CONCAT( SCHEMANAME, ".", TABLENAME ) AS `table`,

"N/A" AS `partitions_deleted`;

END IF;

END $$

CREATE PROCEDURE myawr.`partition_maintenance`(SCHEMA_NAME VARCHAR(32), TABLE_NAME VARCHAR(32), KEEP_DATA_DAYS INT, HOURLY_INTERVAL INT, CREATE_NEXT_INTERVALS INT)

BEGIN

DECLARE OLDER_THAN_PARTITION_DATE VARCHAR(16);

DECLARE PARTITION_NAME VARCHAR(16);

DECLARE OLD_PARTITION_NAME VARCHAR(16);

DECLARE LESS_THAN_TIMESTAMP INT;

DECLARE CUR_TIME INT;

CALL partition_verify(SCHEMA_NAME, TABLE_NAME, HOURLY_INTERVAL);

SET CUR_TIME = UNIX_TIMESTAMP(DATE_FORMAT(NOW(), '%Y-%m-%d 00:00:00'));

SET @__interval = 1;

create_loop: LOOP

IF @__interval > CREATE_NEXT_INTERVALS THEN

LEAVE create_loop;

END IF;

SET LESS_THAN_TIMESTAMP = CUR_TIME + (HOURLY_INTERVAL * @__interval * 3600);

SET PARTITION_NAME = FROM_UNIXTIME(CUR_TIME + HOURLY_INTERVAL * (@__interval - 1) * 3600, 'p%Y%m%d%H00');

IF(PARTITION_NAME != OLD_PARTITION_NAME) THEN

CALL partition_create(SCHEMA_NAME, TABLE_NAME, PARTITION_NAME, LESS_THAN_TIMESTAMP);

END IF;

SET @__interval=@__interval+1;

SET OLD_PARTITION_NAME = PARTITION_NAME;

END LOOP;

SET OLDER_THAN_PARTITION_DATE=DATE_FORMAT(DATE_SUB(NOW(), INTERVAL KEEP_DATA_DAYS DAY), '%Y%m%d0000');

CALL partition_drop(SCHEMA_NAME, TABLE_NAME, OLDER_THAN_PARTITION_DATE);

END$$

CREATE PROCEDURE myawr.proc_awr_killdump( )

BEGIN

declare dump_id INT default false;

DECLARE done INT DEFAULT FALSE;

DECLARE myCursor CURSOR FOR SELECT id FROM information_schema.PROCESSLIST WHERE INFO like 'SELECT /*!40001 SQL_NO_CACHE */ * FROM%';

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

SET @dump_id ='';

OPEN myCursor;

read_loop :

LOOP

FETCH myCursor INTO dump_id;

done THEN

LEAVE read_loop;

END IF;

insert into myawr.mysqldumplog(ID,USER,HOST,DB,COMMAND,TIME,STATE,INFO) select ID,USER,HOST,DB,COMMAND,TIME,STATE,INFO from information_schema.processlist where id=dump_id;

call mysql.rds_kill(dump_id);

END LOOP;

END

CREATE procedure myawr.proc_awr_getstatus()

begin

declare insertSessionCount INT default 0; -- 声明insert会话的计数器

set @ha=unix_timestamp(now());

-- 查看是否有insert 会话

select count(*) into insertSessionCount from information_schema.processlist where INFO like 'insert into myawr.processliststatus%';

-- 如果之前存在未结束的insert会话，则本次不insert

IF insertSessionCount <1 THEN

-- 排除非活跃会话和系统会话,并做截断操作

insert into myawr.processliststatus(ID,USER,HOST,DB,COMMAND,TIME,STATE,INFO,snapid) select ID,USER,HOST,DB,COMMAND,TIME,STATE,substring(INFO,1,3000), @ha from information_schema.processlist where COMMAND not in ('Sleep','Daemon','Binlog Dump GTID') and INFO not like 'insert into myawr.processliststatus%';

END IF;

insert into myawr.lockstatus(wating_trx_state,waiting_trx_id,waiting_thread,waiting_query,blocking_trx_state,blocking_trx_id,blocking_thread,blocking_query,snapid) SELECT r.trx_state wating_trx_state,r.trx_id waiting_trx_id,r.trx_mysql_thread_Id waiting_thread,r.trx_query waiting_query,b.trx_state blocking_trx_state,b.trx_id blocking_trx_id,b.trx_mysql_thread_id blocking_thread,b.trx_query blocking_query,@ha 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;

end

create procedure myawr.proc_awr_enable(proc_name varchar(64))

begin

/*declare proc_cursor varchar(64) default false;

DECLARE done INT DEFAULT FALSE;

DECLARE myCursor CURSOR FOR select name from mysql.event where db='myawr' and name like 'event\_awr\_%' and name not in ('event_awr_resetpartition');

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;*/

if proc_name = 'all' then

/*SET @proc_cursor ='';

OPEN myCursor;

read_loop :

LOOP

FETCH myCursor INTO proc_cursor;

done THEN

LEAVE read_loop;

END IF;

alter event proc_cursor enable;

END LOOP;*/

select "抱歉，该参数现在还没能实现，敬请期待" as msg;

elseif proc_name = 'killdump' then

alter event event_awr_killdump enable;

select "enable event_awr_killdump succeed ~" as msg;

elseif proc_name = 'getmysqlstatus' then

alter event event_awr_getMysqlStatus enable;

select "enable event_awr_getMysqlStatus succeed ~" as msg;

else

select "参量输入有误抑或没有布置awr脚本！" as msg;

end if;

end

create procedure myawr.proc_awr_disable(proc_name varchar(64))

begin

/*declare proc_cursor varchar(64) default false;

DECLARE done INT DEFAULT FALSE;

DECLARE myCursor CURSOR FOR select name from mysql.event where db='myawr' and name like 'event\_awr\_%' and name not in ('event_awr_resetpartition');

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;*/

if proc_name = 'all' then

/*SET @proc_cursor ='';

OPEN myCursor;

read_loop :

LOOP

FETCH myCursor INTO proc_cursor;

done THEN

LEAVE read_loop;

END IF;

alter event proc_cursor enable;

END LOOP;*/

select "抱歉，该参数现在还没能实现，敬请期待" as msg;

elseif proc_name = 'killdump' then

alter event event_awr_killdump disable;

select "disable event_awr_killdump succeed ~" as msg;

elseif proc_name = 'getmysqlstatus' then

alter event event_awr_getMysqlStatus disable;

select "disable event event_awr_getMysqlStatus succeed ~" as msg;

else

select "参量输入有误抑或没有布置awr脚本！" as msg;

end if;

end

CREATE PROCEDURE myawr.myawr_help()

BEGIN

select "

1、实现功能：

1.1、默认每10s会收集一次mysql的processlist状态和锁等待情况。

1.2、默认每9s检查是否存在dump操作，如果存在将会kill线程，并且将此记录在mysqldump_log表中。

2、更改参数：

2.1、修改脚本收集或检查的频率

最小时间不应该小于7s，否则可能会对数据库性能产生影响。

mysql> call proc_awr_changeint('killdump',5);

2.2、启用或停止脚本部分功能

mysql> call proc_awr_enable('all');

mysql> call proc_awr_enable('killdump');

mysql> call proc_awr_enable('getmysqlstatus');

mysql> call proc_awr_disable('all');

mysql> call proc_awr_disable('killdump');

mysql> call proc_awr_disable('getmysqlstatus');

3、dump操作：

3.1、停止非法dump监控事件

mysql> call proc_awr_disable('killdump');

4.2、进行dump操作

mysqldump --single-transaction ***

3.3、恢复监控事件

mysql> call proc_awr_enable('killdump');" AS help_message;

end

create event myawr.event_awr_getMysqlStatus

ON SCHEDULE

-- 每隔10秒运行

every 10 second

on completion preserve

do call proc_awr_getstatus();

CREATE EVENT myawr.event_awr_killdump

ON SCHEDULE

-- 每隔9秒运行

EVERY 9 SECOND

ON COMPLETION PRESERVE

DO CALL proc_awr_killdump ();

create event myawr.event_awr_resetpartition

ON SCHEDULE

every 1 day

on completion preserve

begin

call partition_maintenance('myawr','processliststatus',7,24,30);

call partition_maintenance('myawr','lockstatus',7,24,30);

end

..experience, Working case

SQL Server数据文件结构

2020-09-24 没有评论

Data file 结构：第一个extent:

page 0 : File Header，注m_type = 15，Metadata: ObjectId = 99

page 1 : PFS( page free space)，注m_type = 11，Metadata: ObjectId = 99

page 2 : GAM ( global allocation map)，注m_type = 8，Metadata: ObjectId = 99，每个GAM管理4GB的页面，所以每隔4GB大小的页面，会有一个GAM。

page 3 : SGAM ( shared global allocation map)，注m_type = 9，Metadata: ObjectId = 99

page 4 : 空的，注m_type = 0，Metadata: ObjectId = 0

page 5 : 空的，注m_type = 0，Metadata: ObjectId = 0

page 6 : DCM（differential change map），注m_type = 16，Metadata: ObjectId = 99

page 7 ：BCM（bulk change map），注m_type = 17，Metadata: ObjectId = 99

page 0 : File Header，注m_type = 15，Metadata: ObjectId = 99

page 1 : PFS( page free space)，注m_type = 11，Metadata: ObjectId = 99

page 2 : GAM ( global allocation map)，注m_type = 8，Metadata: ObjectId = 99，每个GAM管理4GB的页面，所以每隔4GB大小的页面，会有一个GAM。

page 3 : SGAM ( shared global allocation map)，注m_type = 9，Metadata: ObjectId = 99

page 4 : 空的，注m_type = 0，Metadata: ObjectId = 0

page 5 : 空的，注m_type = 0，Metadata: ObjectId = 0

page 6 : DCM（differential change map），注m_type = 16，Metadata: ObjectId = 99

page 7 ：BCM（bulk change map），注m_type = 17，Metadata: ObjectId = 99

注意，如果大temp文件（一个超过4G）的page latch，往往是在temp数据文件的第一个extent的第2个page上，其争用可以用下面的sql监控： [crayon-6790 […]

Study note

数据库内查询pg的表结构定义

2020-09-24 没有评论

需要利用到plperlu和自己写一个system函数。

-bash-4.2$ psql
psql (9.6.2)
Type "help" for help.

postgres=# create extension plperlu;
CREATE EXTENSION
postgres=# \dx
                      List of installed extensions
  Name   | Version |   Schema   |              Description               
---------+---------+------------+----------------------------------------
 plperlu | 1.0     | pg_catalog | PL/PerlU untrusted procedural language
 plpgsql | 1.0     | pg_catalog | PL/pgSQL procedural language
(2 rows)

-bash-4.2$ psql

psql (9.6.2)

Type "help" for help.

postgres=# create extension plperlu;

CREATE EXTENSION

postgres=# \dx

List of installed extensions

Name | Version | Schema | Description

---------+---------+------------+----------------------------------------

plperlu | 1.0 | pg_catalog | PL/PerlU untrusted procedural language

plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language

(2 rows)

postgres=# CREATE OR REPLACE FUNCTION system(text) RETURNS text
postgres-# AS 'my $cmd=shift; return `cd /tmp;$cmd`;' LANGUAGE plperlu;
CREATE FUNCTION
postgres=# 
postgres=#

postgres=# CREATE OR REPLACE FUNCTION system(text) RETURNS text

postgres-# AS 'my $cmd=shift; return `cd /tmp;$cmd`;' LANGUAGE plperlu;

CREATE FUNCTION

postgres=#

postgres=# select system('pg_dump -s -t orasup_test1 dbinfo2 |egrep -v "^--|^$"');
                       system                        
-----------------------------------------------------
 SET statement_timeout = 0;                         +
 SET lock_timeout = 0;                              +
 SET idle_in_transaction_session_timeout = 0;       +
 SET client_encoding = 'UTF8';                      +
 SET standard_conforming_strings = on;              +
 SET check_function_bodies = false;                 +
 SET client_min_messages = warning;                 +
 SET row_security = off;                            +
 SET search_path = public, pg_catalog;              +
 SET default_tablespace = '';                       +
 SET default_with_oids = false;                     +
 CREATE TABLE orasup_test1 (                        +
     a integer,                                     +
     b character varying(200)                       +
 );                                                 +
 ALTER TABLE orasup_test1 OWNER TO djidba_rw;       +
 CREATE INDEX idx_b ON orasup_test1 USING btree (b);+
 
(1 row)

postgres=# 
postgres=#

postgres=# select system('pg_dump -s -t orasup_test1 dbinfo2 |egrep -v "^--|^$"');

system

-----------------------------------------------------

SET statement_timeout = 0; +

SET lock_timeout = 0; +

SET idle_in_transaction_session_timeout = 0; +

SET client_encoding = 'UTF8'; +

SET standard_conforming_strings = on; +

SET check_function_bodies = false; +

SET client_min_messages = warning; +

SET row_security = off; +

SET search_path = public, pg_catalog; +

SET default_tablespace = ''; +

SET default_with_oids = false; +

CREATE TABLE orasup_test1 ( +

a integer, +

b character varying(200) +

); +

ALTER TABLE orasup_test1 OWNER TO djidba_rw; +

CREATE INDEX idx_b ON orasup_test1 USING btree (b);+

(1 row)

postgres=#

..experience, Working case

How to upgrade aws rds postgresql

2020-09-24 没有评论

## 0. Read the summary of upgrade pg https://docs.aws.amazon.com/zh_cn/AmazonRDS/latest/UserGuide/USER_UpgradeDBInstance.PostgreSQL.html ## 1. Prepare […]

« 上一页 1 2 3 4 5 … 53 下一页 »