Fix a problem reading from temp databases in SQLITE_DIRECT_OVERFLOW_READ
builds.

FossilOrigin-Name: 81629ba91475938b6ad528e7b1dbef4ad22239782bb2e9c1bb59413aba11da87

Small size and performance improvement in pcacheManageDirtyList() by not
zeroing the PgHdr.pDirtyNext and PgHdr.pDirtyPrev pointers for PgHdr objects
that are not on the dirty list.

FossilOrigin-Nam

Small size and performance improvement in pcacheManageDirtyList() by not
zeroing the PgHdr.pDirtyNext and PgHdr.pDirtyPrev pointers for PgHdr objects
that are not on the dirty list.

FossilOrigin-Name: 919863b14859d958d6c078097faae02070c7bd082e2814cf3f84bd84921e4419

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Reorder fields in the PgHdr object for a performance increase.

FossilOrigin-Name: 326e63d71e0e164c5bcd1f74772cb4071b82daf6f04a5d440b985bace5a4c941

Remove the unused PGHDR_NEED_READ flag. Add invariant checking (during
SQLITE_DEBUG builds only) for the PgHdr object.

FossilOrigin-Name: 771c5411e9ebcad00fb4b97556b519488284b87b

For in-memory databases, it does not matter if pcache entries are marked
"clean" or "writable".

FossilOrigin-Name: ad601c7962a60a11699cf31f1faee09b95d5c710

Add a function prototype in order to fix a compiler warning.

FossilOrigin-Name: 49aec9718d61c9f12aed96f530128666c3b01c81

On commit, flush dirty temp-file pages only if the file is already open and 25% or more of the cache is dirty.

FossilOrigin-Name: f6babf2920340f25815c0a3c58de1e902c2f5542

If a single page is written to the wal file more than once, have each subsequent copy overwrite the original frame.

FossilOrigin-Name: 5d113aef2c7d746e8eda88d4e36c04a39b0a11be

First attempt at enhancing the "PRAGMA cache_spill" statement to accept a
cache threashold size.

FossilOrigin-Name: 549d42be0dac87dc04c3eeccfdc60615c3a6ad3f

Add the PGHDR_WRITEABLE bit for PgHdr.flags which is used to
distinguish between pages that are on the dirty list and pages that are
safe to modify.

FossilOrigin-Name: 7c4ef7b7c8744af19075bb96d1e0b

Add the PGHDR_WRITEABLE bit for PgHdr.flags which is used to
distinguish between pages that are on the dirty list and pages that are
safe to modify.

FossilOrigin-Name: 7c4ef7b7c8744af19075bb96d1e0b63e35978ed1

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Add the new PGHDR_CLEAN bit to PgHdr.flags in pcache.c. This bit is always
the opposite of PGHDR_DIRTY. Use the extra bit to avoid a comparison
for a small performance boost.

FossilOrigin-Name: 86

Add the new PGHDR_CLEAN bit to PgHdr.flags in pcache.c. This bit is always
the opposite of PGHDR_DIRTY. Use the extra bit to avoid a comparison
for a small performance boost.

FossilOrigin-Name: 8619fc346d9a5a66a3c4566b4cc032b6b6bf73fd

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Add the SQLITE_CONFIG_PCACHE_HDRSZ option for sqlite3_config().

FossilOrigin-Name: 6eb03e62a34e8e0964175283587247b0212db604

Refactor the sqlite3PcacheFetch() routine into three separate routines,
which are significantly faster overall and about 100 bytes smaller in
size as well.

FossilOrigin-Name: bdb6e4978d1a26d5f795262

Refactor the sqlite3PcacheFetch() routine into three separate routines,
which are significantly faster overall and about 100 bytes smaller in
size as well.

FossilOrigin-Name: bdb6e4978d1a26d5f795262172605184264ede9c

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Change the page cache so that a new sqlite3_pcache object is allocated as
soon as the page cache is opened, not delayed until the first fetch request.
This give a noticable performance boost. The in

Change the page cache so that a new sqlite3_pcache object is allocated as
soon as the page cache is opened, not delayed until the first fetch request.
This give a noticable performance boost. The interface between pager and
the page cache has changed slightly, which might break ZIPVFS.

FossilOrigin-Name: f1f94a971e031e784f8c30a6faf829df58709329

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Use mmap() to read from the database file in rollback mode. This branch is unix only for now.

FossilOrigin-Name: 6f21d9cbf5d457e63a7282015a89ae785526cf6d

Data structure cleanup. Remove unused fields. Rearrange other files for
tighter packing and reduced memory usage.

FossilOrigin-Name: 0bc594e861ae1142e8c6c83f39b095e1432856bf

Add the sqlite3_db_release_memory() interface and the shrink_memory pragma.

FossilOrigin-Name: 3f58e7c8895d1252eff56282c08b1a6f1194452c

Experimental change to the pcache interface to allow page buffers to be allocated separately from their associated container structures.

FossilOrigin-Name: c275c9d323cb1dccb031b199d413ac3a0b244fea

Remove the obsolete "$Id:$" RCS identifier strings from the source code.

FossilOrigin-Name: f6c045f649036958078cb15cd9d5453680c82b0c

Add files that should have gone in with the previous checkin. (CVS 6935)

FossilOrigin-Name: 64c7afc704e95e13fb3315be402525d277a0d8d8

Big change to make pager.c easier to follow. Unused variables removed, comments improved, etc. (CVS 6197)

FossilOrigin-Name: 12f7346c13c180ed73d7a2e3b590be457360254a

Revert (6187). (CVS 6188)

FossilOrigin-Name: a353c1ab376b159c4d12532412365318cdbdcc60

This commit is an error. Reverted by (6188). (CVS 6187)

FossilOrigin-Name: aa67fd0cdb4f53a0c6e15c001d37554d15006718

Fix some compiler warnings that show up when building the amalgamation only. (CVS 5927)

FossilOrigin-Name: d1abe8a1c9a990b02c71d6c249436381c9fde443

Add an API to support custom page cache implementations. (CVS 5899)

FossilOrigin-Name: 47866d6708e9b69e367937fd85f93580fd025447