介绍
所有的GoldenGate进程均有参数文件
Manager
Extract
Replicat
Utilities
所有参数均有缺省配置
实际应用只需对小部分参数进行配置
所有参数文件均放在 ./dirprm目录下
缺省通过进程名进行查找
一、全局参数
MGRSERVNAME Specifies the name of the Manager process when it is installed as a Windows service.
CHECKPOINTTABLE Specifies a default checkpoint table.
GGSCHEMA Specifies the name of the schema that contains the database objects that support DDL synchronization for Oracle.
DDLTABLE Specifies a non-default name for the DDL history table that supports DDL synchronization for Oracle.
MARKERTABLE Specifies a non-default name for the DDL marker table that supports DDL synchronization for Oracle.
OUTPUTFILEUMASK Specifies a umask that can be used by Oracle GoldenGate processes to create trail files and discard files.
SYSLOG Filters the types of Oracle GoldenGate messages that are written to the system logs.
UNLOCKEDTRAILFILES Workaround for problems with trail files that remain locked by Collector if there is a network outage that affects the target system.
二、Manager进程相关参数
1、常用参数：
PORT 制定GoldenGate的mgr进程使用哪个 TCP/IP端口侦听请求.
示例：PORT 7809
DYNAMICPORTLIST 指定GoldenGate可以使用那些端口接受extract发送过来的数据.
示例：DYNAMICPORTLIST 7840-7850
AUTOSTART 指定在mgr启动时自动启动那些进程.
示例：AUTOSTART ER *
AUTOSTART extract extsz
AUTORESTART 指定在mgr可以定时重启那些进程。可以在网络中断等故障恢复后自动重起，避免人工干预.
示例：AUTORESTART ER *, WAITMINUTES 5, RETRIES 3 --每隔5分钟尝试启动一次，尝试3次
LAGREPORT 指定在ggserr.log中报告延迟的时间间隔.
示例：LAGREPORTHOURS 1 --每隔一小时检查一次传输延迟情况
LAGCRITICAL 指定认为超过此时间即为严重错误的延迟最大值，如果延迟达到此时间值则会在ggserr.log里面写入一条error信息
示例：LAGCRITICALMINUTES 45 --传输延时超过45分钟将写入警告日志
LAGINFO 指定一个延迟时限，如果延迟达到此时间值则会在ggserr.log里面写入一条info信息
示例：LAGINFOMINUTES 30 --传输延时超过30分钟将写入错误日志
PURGEOLDEXTRACTS 定义自动删除过时的队列以节省硬盘空间。
一般按照两个规则来删除：首先，要满足检查点要求，没有使用过的队列不能删除，保证无数据丢失；其次，可以保留一定的天数。只有当已经使用过且超过设定的天数后的队列会被自动删除。示例：purgeoldextracts /backup/goldengate/dirdat/*,usecheckpoints, minkeepdays 7
2、完整示例：
源端Manager配置参数示例：
GGSCI> view params mgr
PORT 7839 --通信端口7839。 源端和目标端需要保持一致。
DYNAMICPORTLIST 7840-7914 --动态端口列表的范围从7840到7914。当制定端口被占用或者出现通信故障，管理进程将会从列表中选择下一个端口尝试连接，避免通信端口的单点故障。
AUTORESTART EXTRACT *, RETRIES 5, WAITMINUTES 7 --当提取进程中断后尝试自动重启，每隔7分钟尝试启动一次，尝试5次。
PURGEOLDEXTRACTS ./dirdat/*, USECHECKPOINTS, MINKEEPDAYS 10 --定期清理dirdat路径下的本地队列（local trail）。保留期限10天，过期后自动删除。从而控制队列文件的目录不会增长过大。
LAGREPORTHOURS 1 --每隔一小时检查一次传输延迟情况
LAGINFOMINUTES 30 --传输延时超过30分钟将写入错误日志
LAGCRITICALMINUTES 45 --传输延时超过45分钟将写入警告日志
目标端Manager配置参数示例：
GGSCI 4> view params mgr
PORT 7839 --通信端口7839。 生产端和灾备端需要保持一致
USERID goldengate, PASSWORD YGGJBFJGIH, ENCRYPTKEY default
DYNAMICPORTLIST 7840-7914 --动态端口列表的范围从7840到7914。当制定端口被占用或者出现通信故障，管理进程将会从列表中选择下一个端口尝试连接，避免通信端口的单点故障。
AUTORESTART EXTRACT *,RETRIES 5,WAITMINUTES 3 --当提取进程中断后尝试自动重启，每隔7分钟尝试启动一次，尝试5次。
PURGEOLDEXTRACTS ./dirdat/*,usecheckpoints, minkeepdays 5 --定期清理dirdat路径下的远程队列（remote trail）。保留期限5天，过期后自动删除。从而控制队列文件的目录不会增长过大。
--PURGEDDLHISTORY MINKEEPDAYS 7, MAXKEEPDAYS 10 --删除DDL历史表，最小保存7天，最大保存10天。由于此项目没有开启DDL，所以该参数被注释。
--PURGEMARKERHISTORY MINKEEPDAYS 7, MAXKEEPDAYS 10 --删除MARKER历史表，最小保存7天，最大保存10天。此项目没有使用该参数，所以该参数被注释。
LAGREPORTHOURS 1 --每隔一小时检查一次传输延迟情况
LAGINFOMINUTES 30 --传输延时超过30分钟将写入错误日志
LAGCRITICALMINUTES 45 --传输延时超过45分钟将写入警告日志
参考：真实环境的OracleGoldenGate配置参数详解 -- http://blog.itpub.net/29475508/viewspace-1297083/
3、完整可选参数列表
（1）通用参数：
COMMENT | -- Allows insertion of comments in a parameter file.##允许在参数文件中插入注释信息
SYSLOG Filters the types of Oracle GoldenGate messages that are written to the system logs.
（2）端口管理参数：
DYNAMICPORTLIST Specifies the ports that Manager can dynamically allocate.
##指定Manager可以动态分配的端口列表（这些端口将用来接受extract发送过来的数据）
示例：DYNAMICPORTLIST 7840-7850
DYNAMICPORTREASSIGNDELAY Specifies a time to wait before assigning a port number that was previously assigned.
##当要分配的端口被占用时，指定在再次分配前需要等待的时间
PORT Establishes the TCP/IP port number on which Manager listens for requests.
##指定Manager监听请求所使用的TCP/IP端口号，示例：PORT 7809
（3）进程管理参数：
AUTORESTART Specifies processes to be restarted by Manager after a failure.
##指定Manager可（定时）重启哪些进程（可以在网络中断等故障恢复后自动重起，避免人工干预）
示例：AUTORESTART ER *, WAITMINUTES 5, RETRIES 3 --每隔5分钟尝试启动一次，尝试3次
AUTOSTART Specifies processes to be started when Manager starts.
##指定Manager进程启动时，自动启动哪些进程
示例：AUTOSTART ER *
AUTOSTART extract extsz
BOOTDELAYMINUTES Determines how long after system boot time Manager delays until performing main processing activities. This parameter supports Windows.
UPREPORT Determines how often process heartbeat messages are reported.
##确定心跳检测信息多久报告一次
（4）事件管理参数：
DOWNCRITICAL Reports processes that stopped gracefully or abnormally.
DOWNREPORT Controls the frequency for reporting stopped processes.
LAGCRITICAL Specifies a lag threshold that is considered critical and generates a warning to the error log.
指定认为超过此时间即为严重错误的延迟最大值，如果延迟达到此时间值则会在ggserr.log里面写入一条error信息
示例：LAGCRITICALMINUTES 45 --传输延时超过45分钟将写入警告日志
LAGINFO Specifies a lag threshold at which an informational message is reported to the error log.
指定一个延迟时限，如果延迟达到此时间值则会在ggserr.log里面写入一条info信息
示例：LAGINFOMINUTES 30 --传输延时超过30分钟将写入错误日志
LAGREPORT Sets an interval for reporting lag time to the error log
指定在ggserr.log中报告延迟的时间间隔.
示例：LAGREPORTHOURS 1 --每隔一小时检查一次传输延迟情况
（5）数据库登陆：
SOURCEDB Specifies a data source name as part of the login information.
示例：SOURCEDB mydb
SOURCEDB mydb, USERID ggs, PASSWORD ggs123
USERID Provides login information for Manager when it needs to access the database.
示例：USERID /
USERID ggs, PASSWORD ggs123
USERID [email protected], PASSWORD ggs123
USERID data1
USERID ggs, PASSWORD AACAAAAAAAAAAAIALCKDZIRHOJBHOJUH, ENCRYPTKEY superx128
USERID ggs, PASSWORD AACAAAAAAAAAAAIALCKDZIRHOJBHOJUH, ENCRYPTKEY default
（6）维护相关参数：
CHECKMINUTES Determines how often Manager cycles through maintenance activities.
PURGEDDLHISTORY Purges rows from the Oracle DDL history table when they are no longer needed.
PURGEMARKERHISTORY Purges Oracle marker table rows that are no longer needed.
PURGEOLDEXTRACTS Purges trail data that is no longer needed.##自动删除过时的队列以节省硬盘空间。
一般按照两个规则来删除：
首先，要满足检查点要求，没有使用过的队列不能删除，保证无数据丢失；
其次，可以保留一定的天数。只有当已经使用过且超过设定的天数后的队列会被自动删除。
示例：purgeoldextracts /backup/goldengate/dirdat/*,usecheckpoints, minkeepdays 7
PURGEOLDTASKS Purges Extract and Replicat tasks after a specified period of time.
STARTUPVALIDATIONDELAY[CSECS] Sets a delay time after which Manager checks that processes are still running after startup.
参考：Oracle GoldenGate Windows and UNIX Reference Guide 11g Release 1(11.1.1) E17791-01
Oracle Golden Gate 系列八 -- GG 参数文件 说明 http://blog.csdn.net/tianlesoftware/article/details/6970183
二、extract进程相关参数
1、常用参数
抽取进程有以下方面参数:
Checkpoint
复制目标
Local System
Multiple Remote Systems
One to many GoldenGate Trails
数据源
Which Tables
Which Rows and Columns
Which Operations
数据影射和变换
table参数：
Syntax:
TABLE <file name>
[, WHERE (<where condition>)]
[, FILTER (<expression>)]
[, KEYCOLS (<key column specification>)]
[, COLS (<column>) | [ , <column> ]) ]
[, COLSEXCEPT (<column>) | [ , <column> ]) ]
[, FETCHCOLS (<column>) | [ , <column> ]) ]
[, FETCHCOLSEXCEPT (<column>) | [ , <column> ]) ]
[, SQLEXEC <clause> ]
[, FETCHBEFOREFILTER ]
[, SQLPREDICATE “WHERE <clause>” ]
[, COLMAP (<column mapping specification>)]
[, <record type filter>, <record type filter>, …]
;
注意：TABLE的结尾有一个分号。
2、完整示例
参数文件举例：日志抽取进程
extract extsz
userid goldengate, password *******
--REPORT AT 01:59
--reportrollover at 02:00
--transmemory directory (/backup/goldengate/dirtmp,8G,4G),ram 2G,transram 500M
tranlogoptions rawdeviceoffset 0
--warnlongtrans 12h, checkintervals 30m
exttrail /backup/goldengate/dirdat/sz
dynamicresolution
numfiles 2000
tableexclude ctais2.TMP_*;
tableexclude ctais2.BAK_*;
tableexclude ctais2.MLOG$_*;
tableexclude ctais2.RUPD$_*;
tableexclude ctais2.KJ_*;
table ctais2.*;
参数文件举例：传输进程
extract dpesz
setenv ( NLS_LANG = AMERICAN_AMERICA.ZHS16GBK )
passthru
REPORT AT 01:59
reportrollover at 02:00
transmemory directory (/backup/goldengate/dirtmp,8G,4G), ram 2G,transram 500M
--threadoptions iolatencydelay 3000
rmthost 99.16.1.12,mgrport 7809, compress
rmttrail /oradata/goldengate/dirdat/sz
dynamicresolution
numfiles 3000
table ctais2.*;
示例3：
extract extl --抽取进程名
userid ddw,password ddw --连接本机DB的帐号密码
rmthost 192.168.0.44, mgrport 7801 --目标数据库服务器地址和GG服务端口号
rmttrail d:\tools\GG\gg10g\dirdat\rl --远程队列的位置
dynamicresolution --优化参数，动态分析表结构
gettruncates --抓取truncate数据
table ddw.aatest; --需要抽取的表，可以使用通配符
3、全部可选参数
（1）通用参数
CHECKPARAMS Verifies parameter file syntax.
如果加入该参数，表示下次运行只是检查一下语法，并不实际运行进程。 注意：该命令只能检查一些简单语法，并不能保证参数文件是完全正确的。
COMMENT | -- Denotes comments in a parameter file. ##注释行，也可以用两个中划线--代替.--checkparams表示本行已经被注释掉
ETOLDFORMAT Generates trails in a format that is compatible with Replicat versions prior to Oracle GoldenGate version 6.0.
GETENV Retrieves variables that were set with the SETENV parameter.
SETENV Specifies a value for a UNIX environment variable from within the GGSCI interface.
针对extract进程设定系统环境变量。
示例：SETENV (NLS_LANG="AMERICAN_AMERICA.UTF8") --设置字符集环境变量为UTF8
OBEY Processes parameter statements contained in a different parameter file.
可以将外部文件的内容包含到本参数文件中来。用于将一些可以重复利用的参数文件部分内容隔离出来，便于统一修改。Obey tables.txt
RECOVERYOPTIONS Controls the recovery mode of the Extract process.
TCPSOURCETIMER |
NOTCPSOURCETIMER Adjusts timestamps of records transferred to other systems when those systems reflect different times.
TRACETABLE |
NOTRACETABLE Causes Extract to ignore database changes generated by Replicat during bidirectional synchronization. Supports Oracle
（2）处理方法Processing method
BEGIN Specifies when to begin a processing run.
DSOPTIONS Specifies Extract processing options when a Teradata Access Module (TAM) is being used.
END Specifies when to end a processing run.
EXTRACT Defines an Extract group as an online process. ##定义抽取进程的名字
GETAPPLOPS |
IGNOREAPPLOPS Controls whether or not operations from all processes except Replicat are written to a trail or file.
GETREPLICATES |
IGNOREREPLICATES Controls whether or not replicated operations are captured by an Extract on the same system.
PASSTHRU | Controls whether tables will be processed by a data-pump Extract in pass-through mode or whether data definitions will be required
NOPASSTHRU 禁止extract与数据库交互，适用于Data Pump传输进程（dpeXX）。
说明：PASSTHRU直通模式用在两边表名、列名一致，可以直接映射的情况，不需要额外配置；
NOPASSTHRU普通模式可以配置表名列名自定义映射，可以加FILTER、transformation等，需要配置一个数据定义文件（data-definitions file）
RMTTASK Creates a processing task on a remote system.
SOURCEISTABLE Extracts entire records from source tables.
SPECIALRUN Specifies a one-time processing task that does not checkpoint from run to run.
VAM Indicates that a Teradata Access Module (TAM) is being used to provide transactional data to the Extract process.
（3）数据库登陆Database login
SOURCEDB Specifies the data source as part of the login information.
USERID Specifies database connection information.
[SOURCEDB,] USERID ,PASSWORD 指定所要登陆的数据库名称，用户名和密码。对于oracle无需指定sourcedb，直接指定用户名和密码即可。
Userid goldengate, password goldengate
（4）数据匹配和映射 Selecting and mapping data
ASCIITOEBCDIC Converts ASCII text to EBCDIC for DB2 on z/OS systems running UNIX System Services.
COLMATCH Establishes global column-mapping rules.
COMPRESSDELETES |
NOCOMPRESSDELETES Controls whether Oracle GoldenGate writes only the key or all columns to the trail for delete operations.
COMPRESSUPDATES |
NOCOMPRESSUPDATES Causes only primary key columns and changed columns to be logged for updates.
DDL Enables and filters the capture of DDL operations.
DDLSUBST Enables string substitution in DDL processing.
FETCHOPTIONS Controls certain aspects of the way that Oracle GoldenGate fetches data.
示例：FETCHOPTIONS NOUSESNAPSHOT --不会从闪回日志中获取数据
FETCHOPTIONS FETCHPKUPDATECOLS
--当使用了 HANDLECOLLISIONS 时，请使用该参数。复制进程出现丢失update记录（missing update）并且更新的是主键，update将转换成insert。由于插入的记录可能不是完整的行，若要保证完整需要加入此参数
GETDELETES | IGNOREDELETES Controls the extraction of delete operations.是否复制delete操作，缺省复制
GETINSERTS | IGNOREINSERTS Controls the extraction of insert operations.是否复制insert操作，缺省复制
GETTRUNCATES |IGNORETRUNCATES Controls the extraction of truncate statements. 是否复制truncate操作，缺省不复制.
GETUPDATEAFTERS | IGNOREUPDATEAFTERS Controls the extraction of update after images.##是否在队列中写入后影像，缺省复制
GETUPDATEBEFORES |IGNOREUPDATEBEFORES Controls the extraction of update before images.是否在队列中写入前影像，缺省不复制
GETUPDATES | IGNOREUPDATES Controls the extraction of update operations 是否复制update操作，缺省复制
REPLACEBADCHAR Replaces invalid character values with another value.
SEQUENCE Specifies sequences for synchronization.
TABLE for Extract Specifies tables for extraction and controls column mapping and conversion.
TABLEEXCLUDE Excludes tables from the extraction process.
定义所需要排除的表。如果在table里面定义了使用通配符，那么可以使用该参数定义排除掉其中的部分���。如：
tableexclude ctais2.TMP_*;
tableexclude ctais2.TEMPTAB;
TARGETDEFS Specifies a file containing target table definitions for target databases that reside on the NonStop platform.
TRIMSPACES |
NOTRIMSPACES Controls whether trailing spaces are trimmed or not when mapping CHAR to VARCHAR columns.
WILDCARDRESOLVE Defines rules for processing wildcard table specifications in a TABLE statement.
（5）数据转发 Routing data
EXTFILE Specifies an extract file to which extracted data is written on the local system.
EXTTRAIL Specifies a trail to which extracted data is written on the local system.
指定写入到本地的哪个队列。
示例：EXTTRAIL ./dirdat/ya --本地队列文件路径
RMTFILE Specifies an extract file to which extracted data is written on a remote system.
RMTHOST Specifies the target system and Manager port number.
指定目标系统及其GoldenGate Manager进程的端口号，也用于定义是否使用压缩进行传输。
示例：rmthost 99.16.1.12,mgrport 7809, compress
RMTTRAIL Specifies a trail to which extracted data is written on a remote system.
指定写入到目标端的哪个队列
（6）数据格式化Formatting data
FORMATASCII Formats extracted data in external ASCII format.
FORMATSQL Formats extracted data into equivalent SQL statements.
FORMATXML Formats extracted data into equivalent XML syntax.
NOHEADERS Prevents record headers from being written to the trail.
（7）自定义处理 Custom processing
CUSEREXIT Invokes a user exit routine during processing.
INCLUDE Invokes a macro library.
MACRO Defines an Oracle GoldenGate macro.
MACROCHAR Defines a macro character other than the default of #.
SQLEXEC Executes a stored procedure or query during Extract processing.
在extract运行时首先运行一个sql语句。 示例：sqlexec "Alter session set constraints=deferred"
VARWIDTHNCHAR |
NOVARWIDTHNCHAR Controls whether length information is written to the trail for NCHAR columns.
（8）报告信息Reporting
CMDTRACE Displays macro expansion steps in the Extract report file.
LIST | NOLIST Displays or suppresses the listing of macros in the report file.
REPORT Schedules a statistical report.
定义自动定时报告。REPORT AT 01:59
STATOPTIONS Specifies information to include in statistical displays.
定义每次使用stat时统计数字是否需要重置
REPORTCOUNT Reports the number of records processed.报告已经处理的纪录条数统计数字。
示例：REPORTCOUNT EVERY 30 MINUTES, RATE
--每隔30分钟报告一次从程序开始到现在的抽取进程或者复制进程的事物记录数，并汇报进程的统计信息
TRACE/TRACE2 Shows Extract processing information to assist in revealing processing bottlenecks.
打开对GoldenGate进程的跟踪日志，一般用于调试。
WARNLONGTRANS Defines a long-running transaction and controls the frequency of checking for and reporting them
指定对于超过一定时间的长交易可以在ggserr.log里面写入警告信息。例如，每隔30分钟检查一次长交易，对于超过12个小时的进行告警：
示例：warnlongtrans 12h, checkintervals 30m
WARNLONGTRANS 2h, CHECKINTERVAL 3m --每隔3分钟检查一下大事务，超过2小时还没结束的进行报告
（9）错误处理Error handling
DDLERROR Controls error handling for DDL extraction.
DISCARDFILE Contains records that could not be processed.
定义discard文件位置，如果处理中有纪录出错会写入到此文件中。
示例1：discardfile /oradata/goldengate/repkj.dsc,append,megabytes 100m
示例2：DISCARDFILE ./dirrpt/extya.dsc, APPEND, MEGABYTES 1024
--将执行失败的记录保存在discard file中，该文件位于./dirrpt/extya.dsc,大小为1024MB。 文件中已经包含记录的话，再后面继续追加，不删除之前的记录
（10）协调Tuning
ALLOCFILES Controls the number of incremental memory structures allocated when the value of NUMFILES is reached.
BR Controls the Bounded Recovery feature of Extract.
CACHEMGR Controls the virtual memory cache manager.
示例：CACHEMGR CACHESIZE 8000MB, CACHEDIRECTORY /goldengate/temp, CACHEDIRECTORY /goldengate/temp2
在/goldengate/temp,/goldengate/temp2 目录设置虚拟内存
CHECKPOINTSECS Controls how often Extract writes a checkpoint.
DBOPTIONS Specifies database options.指定对于某种特定数据库所需要的特殊参数
示例：DBOPTIONS ALLOWUNUSEDCOLUMN
--当抽取进程遇到一个没有使用的字段时只生成一个警告，进程会继续执行而不会被异常终止（abend）
DDLOPTIONS Specifies DDL processing options.
DYNAMICRESOLUTION |
NODYNAMICRESOLUTION Suppresses the metadata lookup for a table until Extract encounters transactional data for it. Makes Extract start faster when there are numerous tables specified for synchronization.
示例：DYNAMICRESOLUTION --有时候开启OGG进程的时候较慢，可能是因为需要同步的表太多，OGG在开启进程之前会将需要同步的表建立一个记录并且存入到磁盘中，这样就需要耗费大量的时间。使用该参数来解决此问题。
EOFDELAY | EOFDELAYCSECS Determines how long Extract delays before searching for more data to process.
FLUSHSECS | FLUSHCSECS Determines the amount of time that record data remains buffered before being written to the trail.
FUNCTIONSTACKSIZE Controls the size of the memory stack that is used for processing Oracle GoldenGate functions.
GROUPTRANSOPS Controls the number of records that are sent to the trail in one batch.
LOBMEMORY Controls the amount of memory and temporary disk space available for caching transactions that contain LOB s.
MAXFETCHSTATEMENTS Controls the maximum number of prepared queries that Extract can use to fetch data from the database.
NUMFILES Controls the initial allocation of memory dedicated to storing information about tables to be processed by Oracle GoldenGate.
定义本extract为最大多少张表预留空间，缺省为500，超过500张表需要设定一个比实际表数略大的值。
示例：numfiles 3000
RMTHOSTOPTIONS Specifies connection attributes other than host information for a TCP/IP connection used by a passive Extract group.
THREADOPTIONS Controls aspects of the way that Extract operates in an Oracle Real Application Cluster environment. Supports Oracle.
示例：THREADOPTIONS MAXCOMMITPROPAGATIONDELAY 60000 IOLATENCY 60000
RAC集群中的所有节点必须同步系统时钟。GoldenGate通过比较本地系统的时间和事务提交的时间点来做出关键决策。可以通过NTP来不同系统时间。所有节点上的COMPATIBLE参数设置也必须相同。注：这个参数在Oracle11.2版本后就不再使用了。
TRANLOGOPTIONS Supplies log-processing options.
指定在解析数据库日志时所需要的特殊参数。例如，对于裸设备，可能需要加入下列参数：
示例1： tranlogoptions rawdeviceoffset 0
示例2：TRANLOGOPTIONS CONVERTUCS2CLOBS
--指定在解析数据库日志时所需要的特殊参数
--本参数只用在extract端 UTF字符类型，并且11.1.1前处理CLOB才需要:
示例3：--tranlogoptions asmuser sys@asm, asmpassword AACAAAAAAAAAAGAIF, ENCRYPTKEY default
示例4：TRANLOGOPTIONS altarchivelogdest primary instance sgpmdb1 /sgpmdb/arch altarchivelogdest instance sgpmdb2 /sgpmdb/arch 指定RAC环境下每个节点的归档日志地址
TRANSMEMORY Controls the amount of memory and temporary disk space available for caching uncommitted transaction data.
设定GoldenGate的抽取进程能够使用的内存大小。如下参数指定本进程最大只能占用2G内存，其中每个事务最大占用内存不能超过500M，如果超过则使用指定目录作为虚拟内存，该目录下的单个文件大小为4G，最多只能在该目录下占用8G空间作为缓存：
示例：transmemory directory (/backup/goldengate/dirtmp,8G,4G),ram 2G,transram 500M
（11）维护Maintenance
DISCARDROLLOVER Controls how often to create a new discard file.
示例：DISCARDROLLOVER AT 3:00 --为了防止discard file被写满，每天3：00做一次文件过期设定
PURGEOLDEXTRACTS Purges obsolete trail files.同mgr进程，可以设置自动删除队列，建议在mgr设置
REPORTROLLOVER Specifies when to create new report files.
设定切换一个日志的时间和间隔。示例：reportrollover at 02:00
ROLLOVER Specifies the way that trail files are aged.
（12）安全性Security
DECRYPTTRAIL Decrypts data in a trail or extract file. 解密trail文件或extract文件数据
ENCRYPTTRAIL | NOENCRYPTTRAIL Controls encryption of data in a trail or extract file. 加密trail或extract文件的数据