percona server5.6跟5.5的差異統計

一、摒棄掉的：
1、SHOW [GLOBAL] TEMPORARY TABLES功能取消，只能用TEMPORARY_TABLES 和 GLOBAL_TEMPORARY_TABLES
2、innodb_thread_concurrency_timer_based 引數取消，5.5預設是false；開啟的化innodb控制執行緒併發的方式
                                          將會用無鎖的計時器機制。預設使用原始的互斥量機制。
3、innodb_recovery_stats引數廢除：記錄恢復的詳細過程到errorlog裡面。
4、慢查詢日誌和show processlist裡面的rows_read列不再顯示，因為本身是一個很模糊的值，沒有太多有意義。

二、替代：
1、 show engine innodb status 的OLDEST VIEW的輸出部分在5.6中調整到了檢視xtradb_read_view顯示
2、 show engine innodb status 的雜湊表使用記憶體部分調整到XTRADB_INTERNAL_HASH_TABLES顯示
3、 INNODB_RSEG表重新命名成了 XTRADB_RSEG.
4、 為預讀區分配固定大小使用了不同的實現方式：快取預讀區的值只在每一個快取池初始化的時候預先計算一次，
    而不是硬編碼成64MB（之前版本的做法）
5、響應時間分佈統計功能使用外掛形式實現，擴充套件的原來的統計功能，讀寫分別作了單獨統計，複製執行緒的慢更新
   SQL不會被統計到，SHOW QUERY_RESPONSE_TIME命令廢除，直接查詢query_response_time表，重新整理命令也從原來
   的FLUSH QUERY_RESPONSE_TIME改成了變數query_response_time_flush控制

三、相似或者等價的功能點（官方版本加入或者percona自己做了進一步升級）：
1、Crash-Resistant Replication被 MYSQL creash safe replication替代
2、Improved InnoDB I/O Scalability功能補丁做了改進（廢除引數：innodb_adaptive_flushing_method、
   innodb_checkpoint_age_target、innodb_flush_neighbor_pages、innodb_read_ahead
   新增：innodb_log_checksum_algorithm）
3、InnoDB Data Dictionary Size Limit功能在5.6中使用table-definition-cache這個變數來限制資料字典大小
4、Expand Table Import被InnoDB transportable tablespaces功能替代
5、The InnoDB data dictionary INFORMATION_SCHEMA tables have been superseded by the MySQL implementations
6、XtraDB SYS_STATS persistent table and index statistics has been replaced by the MySQL 5.6 implementation
7、Dump/Restore of the Buffer Pool被官方5.6功能替代
8、fast_index_creation (replaced by MySQL 5.6’s ALGORITHM= option).
9、Fast InnoDB Checksum has been deprecated after Percona Server 5.5.28-29.2 because the innodb_checksum_algorithm
   variable in MySQL 5.6 makes it redundant.
10、Handle BLOB End of Line feature has been replaced by MySQL 5.6 binary-mode configuration option.
11、Percona Server 5.5 implemented utf8_general50_ci and ucs2_general50_ci collations as a fix for
    the upstream bug: #27877. These are now being replaced by MySQL 5.6 utf8_general_mysql500_ci
    and ucs2_general_mysql500_ci collations.
12、Percona Server INFORMATION_SCHEMA _STATS tables in 5.5 have been replaced by new tables in MySQL 5.6:
    INNODB_SYS_TABLES, INNODB_SYS_INDEXES, INNODB_SYS_COLUMNS,INNODB_SYS_FIELDS, INNODB_SYS_FOREIGN,
    INNODB_SYS_FOREIGN_COLS,INNODB_SYS_TABLESTATS (although MySQL 5.6 does not have MYSQL_HANDLES_OPENED,
    instead it has REF_COUNT). Following tables haven’t been implemented in MySQL 5.6 but information is
    available in other tables: INNODB_SYS_STATS - use MYSQL.INNODB_(INDEX|TABLE)_STATS instead,
    INNODB_TABLE_STATS - use INNODB_SYS_TABLESTATS or MYSQL.INNODB_TABLE_STATS instead,
    and INNODB_INDEX_STATS - use MYSQL.INNODB_INDEX_STATS instead.

四、從5.5引入：
Feature Ported                                         Version
Thread Pool       5.6.10-60.2
Atomic write support for Fusion-io devices  5.6.11-60.3
Improved InnoDB I/O Scalability    5.6.11-60.3
Improved NUMA support      5.6.11-60.3
Suppress Warning Messages     5.6.11-60.3
Improved MEMORY Storage Engine     5.6.11-60.3
Restricting the number of binlog files    5.6.11-60.3
Too Many Connections Warning     5.6.11-60.3
Error Code Compatibility     5.6.11-60.3
Lock-Free SHOW SLAVE STATUS     5.6.11-60.3
Percona Toolkit UDFs      5.6.11-60.3
Support for Fake Changes     5.6.11-60.3
Kill Idle Transactions      5.6.11-60.3
Enforcing Storage Engine     5.6.11-60.3
Utility user       5.6.11-60.3
Extending the secure-file-priv server option   5.6.11-60.3
Expanded Program Option Modifiers    5.6.11-60.3
XtraDB changed page tracking     5.6.11-60.3
PAM Authentication Plugin     5.6.11-60.3
User Statistics      5.6.11-60.3
Slow Query Log       5.6.11-60.3
Extended Show Engine InnoDB Status    5.6.11-60.3
Count InnoDB Deadlocks      5.6.11-60.3
Log All Client Commands (syslog)    5.6.11-60.3
Show Storage Engines      5.6.11-60.3
Thread Based Profiling      5.6.11-60.3
Fixed Size for the Read Ahead Area    5.6.13-60.5
Improved Buffer Pool Scalability    5.6.13-60.6
Multiple Adaptive Hash Search Partitions   5.6.13-60.6
HandlerSocket       5.6.17-66.0
Response Time Distribution     5.6.21-69.0

五：status和變數差異。。。。

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