TimesTen 应用层数据库缓存学习：11. AWT性能监控
演示环境准备
为了运行以下的例子，我们建立了一个AWT缓存组
Oracle Schema用户:
$ sqlplus tthr/oracle@ttorcl
create table orders(ord_num int primary key, ship_time timestamp not null);
grant select, insert, update, delete on orders to cacheadm;TimesTen Cache管理用户:
cacheadm>
CREATE ASYNCHRONOUS WRITETHROUGH CACHE GROUP "AWT"
FROM
"TTHR"."ORDERS" (
"ORD_NUM" NUMBER(38) NOT NULL,
"SHIP_TIME" TIMESTAMP(6) NOT NULL,
PRIMARY KEY("ORD_NUM")
)
cacheadm> call ttrepstart;
cacheadm> cachegroups;
Cache Group CACHEADM.AWT:
Cache Group Type: Asynchronous Writethrough
Autorefresh: No
Aging: No aging defined
Root Table: TTHR.ORDERS
Table Type: Propagate
1 cache group found.
cacheadm>repschemes;
Replication Scheme TTREP._AWTREPSCHEME:
Element: _1798096
Type: Table TTHR.ORDERS
Master Store: CACHEDB1_1122 on TIMESTEN-HOL Transmit Durable
Subscriber Store: _ORACLE from TIMESTEN-HOL
Store: CACHEDB1_1122 on TIMESTEN-HOL
Port: (auto)
Log Fail Threshold: (none)
Retry Timeout: 120 seconds
Compress Traffic: Disabled
Store: _ORACLE from TIMESTEN-HOL
Port: (auto)
Log Fail Threshold: (none)
Retry Timeout: 120 seconds
Compress Traffic: Disabled
1 replication scheme found.OS用户,下面的输出类似于repschems
$ ttrepadmin -showconfig cachedb1_1122 Self host "TIMESTEN-HOL", port auto, name "CACHEDB1_1122", LSN 19/2685192, timeout 120, threshold 0
List of subscribers -------------------
Peer name Host name Port State Proto Track
---------------- ------------------------ ------ ------- ----- -----
_ORACLE TIMESTEN-HOL Auto Start 38 0 Last Msg Sent Last Msg Recv Latency TPS RecordsPS
------------- ------------- ------- ------- ---------
00:00:05 - -1.00 -1 -1
List of objects and subscriptions ---------------------------------
Table details -------------
Table : TTHR.ORDERS Timestamp updates : -
Master Name Subscriber name
----------- ---------------
CACHEDB1_1122 _ORACLE
TimesTen Schema用户:
tthr>
insert into orders values(1, sysdate);
ALTER SESSION SET PLSQL_TIMEOUT = 0;
declare ord_num number;
begin
for i in 1..1000 loop
select max(ord_num) into ord_num from orders;
insert into orders values(ord_num+1, sysdate);
commit;
dbms_lock.sleep( 1 );
end loop;
end;
/打开 AWT 性能监控
使用ttCacheAWTMonitorConfig打开监控，然后可以用ttRepAdmin查看监控信息。
其中On表示打开，数字16表示16次采样一次，是推荐值，但在我们的例子中，我们采用1，即每次都采样
cacheadm>CALL ttCacheAWTMonitorConfig;
< OFF, 0 >
1 row found.
cacheadm>CALL ttCacheAWTMonitorConfig('off');
< OFF, 0 >
1 row found.
cacheadm>CALL ttCacheAWTMonitorConfig('on');
< ON, 16 >
1 row found.
cacheadm>CALL ttCacheAWTMonitorConfig('on', 1);
< ON, 1 >
1 row found.
cacheadm>CALL ttCacheAWTMonitorConfig;
< ON, 1 >
1 row found.
Display AWT performance results with the ttRepAdmin utility
使用ttRepAdmin的-awtmoninfo 和 -showstatus 选项，例如
$ ttRepAdmin -showstatus -awtmoninfo cachedb1_1122
Replication Agent Status as of: 2016-04-21 18:04:39
DSN : cachedb1_1122
Process ID : 8089 (Started)
Replication Agent Policy : manual
Host : TIMESTEN-HOL
RepListener Port : 42901 (AUTO)
Last write LSN : 18.65272072
Last LSN forced to disk : 18.65271808
Replication hold LSN : 18.65206536
Replication Peers:
Name : _ORACLE
Host : TIMESTEN-HOL
Port : 42901 (AUTO) (Connected)
Replication State : STARTED
Communication Protocol : 38
Name : CACHEDB1_1122
Host : TIMESTEN-HOL
Port : 0 (AUTO)
Replication State : STARTED
Communication Protocol : 38
TRANSMITTER thread(s):
For : _ORACLE (track 0)
Start/Restart count : 1 Send LSN : 18.65245448 Transactions sent : 467 Total packets sent : 856 Tick packets sent : 384 MIN sent packet size : 64 MAX sent packet size : 893 AVG sent packet size : 291 Last packet sent at : 18:04:39 Total Packets received: 854 MIN rcvd packet size : 64 MAX rcvd packet size : 120 AVG rcvd packet size : 119 Last packet rcvd'd at : 18:04:39 TXNs Allocated : 11 TXNs In Use : 5 ACTs Allocated : 11 ACTs In Use : 5 ACTs Data Allocated : 880 Timeout : 120 Adapted Timeout Max : 120 Adapted Timeout Time : 1461285423 current txn : 0.0 Longest batch runtime : 0 Longest batch 1st txn : 0.0 Longest batch lst txn : 0.0 Largest txn (ops) : 1461231493.12371 Largest txn (#ops) : 1 Longest txn (time) : 0.0 Longest txn (secs) : 0 Most recent errors (max 5): TT16025 in repagent.c (line 1227) at 17:34:49 on 04-21-2016 TT16285 in transmitter.c (line 1109) at 17:34:49 on 04-21-2016 TT16999 in transmitter.c (line 1447) at 17:34:49 on 04-21-2016 RECEIVER thread(s): For : CACHEDB1_1122 (track 0) Start/Restart count : 1 Transactions received : 467 Total packets sent : 855 Tick packets sent : 0 MIN sent packet size : 64 MAX sent packet size : 120 AVG sent packet size : 119 Last packet sent at : 18:04:39 Total Packets received: 2259 MIN rcvd packet size : 64 MAX rcvd packet size : 298 AVG rcvd packet size : 110 Last packet rcvd'd at : 18:04:39 rxWaitCTN : 0.0 prevCTN : 0.0 current txn : 0.0 serial CTN : 0.0 STA Blk Data Allocated: 32 STA Data Allocated : 4096 Longest batch runtime : 0 Longest batch 1st txn : 0.0 Longest batch lst txn : 0.0 Largest txn (ops) : 1461231493.12371 Largest txn (#ops) : 5 Longest txn (time) : 0.0 Longest txn (secs) : 0 AWT Monitoring statistics ------------------------- TimesTen processing time : 138.387000 millisecs (100 %) Oracle execute (SQL execution) time : 0.000000 millisecs (0 %) Oracle execute (PL/SQL execution) time : 0.000000 millisecs (0 %) Time since monitoring was started: 375830.816000 millisecs CacheAwtMethod mode : 1 Cache-connect Operational Stats : SQL Operations sent to Oracle : 0 Number of update operations : 0 Number of update batches : 0 Number of insert operations : 0 Number of insert batches : 0 Number of delete operations : 0 Number of delete batches : 0 Total number of batches sent: 0 Number of bytes sent : 0 PL/SQL Operations sent to Oracle : 0 Number of update operations : 0 Number of insert operations : 0 Number of delete operations : 0 Number of batches sent : 0 Number of bytes sent : 0 Number of TimesTen Transactions sent to Oracle (includes retries) : 376 Number of retries on TimesTen due to errors on Oracle : 0 Number of round trips to Oracle (includes executes, commits and rollbacks) : 0 Number of commits on Oracle : 0 Number of rollbacks on Oracle : 0 Number of rxbatches: 376 Number of rxskips: 0 Most recent errors (max 5): TT16025 in repagent.c (line 1227) at 17:34:49 on 04-21-2016 注意AWT Monitoring statistics部分。
Using system tables to monitor AWT operations
查询SYS.MONITOR的LAST_LOG_FILE, REPHOLD_LOG_FILE 和 REPHOLD_LOG_OFF列。
它们的含义为:
- LAST_LOG_FILE: Most recent log file present
- REPHOLD_LOG_FILE: Number of last log file held by replication
- REPHOLD_LOG_OFF: Offset in last log file held by replication
SYS.MONITOR只有一行记录, 输出中的18表示log文件是cachedb1_1122.log18
cacheadm>select LAST_LOG_FILE, REPHOLD_LOG_FILE, REPHOLD_LOG_OFF from SYS.MONITOR;
< 18, 18, 63803656 >
1 row found.
cacheadm>select LAST_LOG_FILE, REPHOLD_LOG_FILE, REPHOLD_LOG_OFF from SYS.MONITOR;
< 18, 18, 63854856 >
1 row found.
cacheadm>select LAST_LOG_FILE, REPHOLD_LOG_FILE, REPHOLD_LOG_OFF from SYS.MONITOR;
< 18, 18, 63854856 >
1 row found.
依据下面的原则来判断是非有问题，即如果复制hold的日志文件和产生的最新日志文件差距不断拉大，则表示复制数据的速度赶不上产生数据的速度
If the difference between the value in the LAST_LOG_FILE column and the value in the REPHOLD_LOG_FILE column is increasing over time, and the value in the REPHOLD_LOG_OFF column is increasing slowly or not changing, then the tables are being updated at a faster rate than the updates are being replicated.
如果有问题，可以结合以下的命令再判断
$ ttRepAdmin -receiver -list cachedb1_1122
Peer name Host name Port State Proto Track
---------------- ------------------------ ------ ------- ----- -----
_ORACLE TIMESTEN-HOL Auto Start 38 0
Last Msg Sent Last Msg Recv Latency TPS RecordsPS Logs
------------- ------------- ------- ------- --------- ----
00:00:04 - -1.00 -1 -1 1